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(meteorobs) Radio Meteor Obs. Bull. Nov 1997: Leonids!
Radio Meteor Observation Bulletin No. 52 December 1997
1. FORWARD SCATTER METEOR OBSERVATIONS
Observer: Enric Fraile Algeciras
Location: Barcelona, Spain (01 59' E, 41 21' N)
Frequency: 48.250 MHz
Transmitter location: most likely Czech television C2 C. Budejovica,
100 kW, horizontal polarisation.
Antenna: 6-element Yagi 617-6B, 14 dBd gain.
Antenna: astronomical azimuth 215 deg (=NE), elevation 0 deg.
Receiver: home made converter 20 dB gain, 1 dB noise and Kenwood TS-830S.
10 dB attenuator in the receiver to reduce direct reception
Sensitivity: 0.25 uV for 10 dB S/N
Observing method: the audio signal of the video carrier is received using
a narrow CW filter (100 Hz) and fed into the PC in real time.
Data sampling system: using a super 14 bits A/D card to PC/XT and
"Data Capture" software with 9 second/18 sampling interval to
store all the > 1.0 s signal increases.
| Nov 1997
UT | 1 2 3 4 5 6 7 8 9
---+------------------------------------
0 | 1 6 6 2 3 6 1 7 7
1 | 1 7 2 5 7 2 2 3 4
2 | 10 14 9 4 4 12 6 4 1
3 | 3 10 21 13 12 14 7 5 11
4 | 9 10 12 16 13 10 12 14 11
5 | 15 11 19 11 18 10 10 23 11
6 | 7 9 17 12 15 10 7 13 12
7 | 12 12 10 8 18 10 8 10 3
8 | 8 17 7 5 6 14 7 8 3
9 | 11 12 11 4 18 9 8 3 4
10 | 6 12 2 4 9 8 2 16 6
11 | 9 19 5 11 10 12 18 2 5
12 | 5 8 5 2 7 1 5 4 4
13 | 6 14 13 5 3 7 2 5 11
14 | 6 6 3 12 6 5 11 7
15 | 9 13 9 3 7 12 10 10
16 | 7 11 2 2 5 4 5 3
17 | 7 7 5 7 6 3 6 7
18 | 7 9 10 2 4 5 7 2
19 | 5 7 11 11 4 7 7 1
20 | 4 7 4 3 7 5 7 1
21 | 5 7 5 2 5 5 7 8
22 | 8 10 5 7 4 4 5 1
23 | 8 1 7 2 2 1 7 4
---+------------------------------------
UT | 1 2 3 4 5 6 7 8 9
| Nov 1997
| Nov 1997
UT | 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
---+----------------------------------------------------------------
0 | 14 1 4 3 3 1 3 1 15 12 44 15 10
1 | 8 4 13 4 5 1 7 3 6 14 95? 14 17
2 | 13 7 7 4 1 1 5 4 17 33 198? 18 14
3 | 11 6 9 13 5 2 5 6 25 51 76? 49 27
4 | 13 8 20 6 13 7 4 7 22 46 49 34 44
5 | 15 5 8 4 10 6 11 6 22 33 156? 32 37
6 | 13 12 9 6 8 2 10 13 17 23 62? 33 28
7 | 14 7 2 5 6 10 9 4 13 23 60? 21 28
8 | 29 40 13 17 11 24 11 12 9 29 26 44 21 20
9 | 11 30 16 5 6 9 3 15 8 18 22 44 26 31
10 | 17 17 6 4 4 2 7 4 2 28 14 38 30 30
11 | 35 41 3 17 4 7 5 12 9 11 14 60? 26 22
12 | 12 12 3 4 6 10 12 17 16 132? 25 15
13 | 44? 5 7 2 4 12 10 31 27 22 26 19
14 | 45? 6 7 7 6 12 10 21 18 23 35 24
15 | 10 6 11 8 4 9 5 18 17 19 23 12
16 | 6 2 6 6 3 10 11 16 18 13 21
17 | 5 9 5 2 8 10 13 21 20 12 17
18 | 7 3 4 5 7 1 3 8 10 15 12 8
19 | 4 4 8 3 5 2 8 5 13 11 18 14 10
20 | 6 6 7 6 4 2 6 7 17 10 10 19 13
21 | 14 6 17 6 4 2 8 7 14 10 14 29 22
22 | 11 3 6 2 5 3 8 6 14 16 17 20 8
23 | 2 2 2 3 2 1 4 2 5 9 17 14 11
---+----------------------------------------------------------------
UT | 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
| Nov 1997
Notes:
. ? probably affected by sporadic-E, direct reception
. Nov 16, 17 and 18: problems with the UPS, lost information.
During the Leonids of Nov 17, I was active in 144 MHz Meteor Scatter
between 08h00 to 12h00 UT. I had only 6 very long reflections about
2 to 6 minutes long, but NOT a single short reflection!
The stronger reflections were on: 07h00, 08h07, 08h20, 08h27 (lasting
4 minutes), 08h43, 09h25, 10h00 (3 min), 10h40, 11h00 (4 min)
Enric Fraile Algeciras
---------------------------------------------------------------------------
Observer: Michael Boschat
Location: Halifax, Canada (63 36'W, 44 39'N, 58 meters above sea level)
Listening Frequency: 83.25 MHz
Receiver: Radio Shack PRO-60 scanner
Antenna : resonant dipole
Antenna Direction: Horizontally polarized with lobes in E-W plane, elev 0 deg
Filter : high-Q bandpass filter between antenna & receiver.
Q is at least 300.
Listening Mode: AM
Recording method: listening by ear
-------------------------------------------
1997 Raw counts Possible
Date UT of Meteors Shower
-------------------------------------------
Nov 6 1545-1645 12
1645-1745 31
1745-1800 27
1800-1900 9
7 1500-1600 19
1600-1700 27
1700-1800 15
8 1500-1600 7
1600-1700 18
1700-1800 13
9 1530-1630 9
1630-1730 16
1730-1830 6
11 1415-1515 18
1515-1615 20
12 1500-1600 16
13 0230-0330 104 Taurids N
13 1519-1619 18
14 0230-0330 29
14 1530-1630 21
1630-1730 22
15 1200-1300 29
1500-1600 12
1600-1700 9
16 0230-0330 28
16 1500-1600 7
17 1415-1515 57 Leonids
1550-1650 38 Leonids
1900-2000 12
18 0100-0200 15
0200-0300 9
0825-0925 45 Leonids
18 1120-1220 42 Leonids
1220-1320 45 Leonids
19 0130-0230 37 Leonids
0230-0330 48 Leonids
19 1140-1240 44 Leonids
20 2300-0000 6
0000-0100 11
0100-0200 19
21 1450-1550 27
Mike Boschat
---------------------------------------------------------------------------
Observer: Giorgio Bressan, Associazione Friulana di Astronomia e
Meteorologia (AFAM)
Location: Remanzacco, near Udine, Italy (13.3 E, 46.1 N)
Antenna: dipole
Frequency: 48.24049 MHz, LSB mode.
Transmitters: TV video carrier in Germany (locator JN39), 24 h operation.
Observing method: automatic setup using FFTDSP42t software by AF9Y to record
the audio signal. 20 channels of 2 Hz width are used for meteor
identification, pictures with interference are manually rejected.
| Counts of Refl. Counts of Refl. Counts of Refl.
| > 26 seconds > 13 seconds > 0.5 seconds
| Nov 1997 Nov 1997 Nov 1997
UT| 16 17 18 16 17 18 16 17 18
---+------------- ------------- -------------
0| 2 1 2 1 41 41
1| 2 1 4 2 58 58
2| 3 1 7 2 54 51
3| 3 1 4 1 66 42
4| 2 1 6 3 70 59
5| 5 1 11 5 95 48
6| 6 2 8 6 73 53
7| 8 0 23 6 128 67
8| 10 4 13 5 102 68
9| 6 13 114
10| 8 10 40
11| 1 3 41
12| 1 1 38
13| 0 0 24
14| 0. 0. 13
15| 0. 0. 20
16| 0 1 11
17| 0 0 31
18| 0 0 27
19| 0 0 21
20| 0 0 0 0 30 22
21| 0 0 0 0 28 21
22| 0 0 0 1 37 31
23| 0 2 1 4 38 39
---+------------- ------------- -------------
UT| 16 17 18 16 17 18 16 17 18
| Nov 1997 Nov 1997 Nov 1997
Notes:
. FFTDSP data processed and remarks by Werfried Kuneth:
Sporadic-E signatures where only seen for a very short period at 11h UT
on Nov. 17. Despite the location close to Udine (large city), the recording
is free of interference! Several meteor reflections appeared at the same
time in Austria and Italy.
Special thanks to Giorgio Bressan and Giovanni Sostero of AFAM for their
great support.
Giorgio Bressan and Giovanni Sostero / via Werfried Kuneth
---------------------------------------------------------------------------
Observer: Eisse Pieter (Peter) Bus
Location: Groningen, Netherlands (6 deg 33' E, 53 deg 13' N)
Frequency: 72.11 MHz
Transmitter Location: Wroclaw, Poland, 130 kW, Distance 740 km
Antenna: Yagi, 3 elements, geographical azimuth 106 deg (ESE),
elevation 13 deg
Receiver: Bearcat UBC 860 XLT Scanning Radio, sensitivity: 0.5 uV
Observation method: Listening and counting in 5-minute intervals.
Mean "sporadic" activity of long-duration reflections > 7 s
on 1997 November 2, 8, 9, 12 and 14 starting at UT:
--------------------------------------------------------------
4h 5h 6h 7h 8h 9h 10h 11h 12h 13h
--------------------------------------------------------------
3 3 2 2 2 2 2 2 1 1
--------------------------------------------------------------
On November 9, 12 and 14 only a part of the observation period is monitored:
Nov 9: 8-14h UT, Nov 12: 4-6h UT, Nov 14: 6-14h UT.
No long-duration (> 20 s) reflections monitored
Uncorrected counts of long-duration reflections > 7 s
during one hour starting at UT:
------------------------------------------
UT 15 Nov 16 Nov 17 Nov 18 Nov
------------------------------------------
5h - - 18 -
6 2 4 19 11
7 2 8 22 12
8 4 7 12 10
9 4 5 13 8
10 2 4 19 5
11 - - 16 -
12 - - 5 -
13 - - 4 -
------------------------------------------
Uncorrected counts of long-duration reflections > 20 s
during one hour starting at UT:
------------------------------------------
UT 15 Nov 16 Nov 17 Nov 18 Nov
------------------------------------------
5h - - 13 -
6 0 0 12 7
7 1 3 10 7
8 1 1 12 1
9 1 0 5 3
10 1 0 8 1
11 - - 6 -
12 - - 1 -
13 - - 1 -
------------------------------------------
Total reflection time of long-duration reflections > 20 s
in seconds during one hour starting at UT:
------------------------------------------
UT 15 Nov 16 Nov 17 Nov 18 Nov
------------------------------------------
5h - - 883 -
6 24 31 1062 638
7 29 436 1124 721
8 65 115 2532 215
9 161 49 678 306
10 47 29 904 65
11 - - 423 -
12 - - 116 -
13 - - 117 -
------------------------------------------
Notes:
. After correction for dead-time and observability function a maximum is
found between 10h30m and 11h15m UT at Solar Longitude 235.16 (2000.0).
For mid-point of the transmitter-receiver path counts:
radiant is rising on November 16 at about 21h30m UT
radiant is setting on November 17 at about 13h40m UT
Most favourable antenna-geometry for detecting Leonids between 5h45m and
7h30m UT.
Unfavourable antenna-geometry after 10h UT.
Very unfavourable antenna-geometry after 12h UT.
Peter Bus
-------------------------------------------------------------------------
Observer: Norman Davis
Location: Shingle Springs, California USA (120.57 W, 38.41 N)
Antenna: 3 element TV Yagi, Radio shack 10db preamp and antenna direction
east, elevation 40 deg.
Receiver: IC-7000 at 67.2499 MHz, USB Mode.
Transmitters: unknown TV channel 4 that could be anywhere between me and
New York.
Observing method: automatic setup using FFTDSP42t software by AF9Y to record
the audio signal. Sound card SB AWE-64. 20 channels of 2 Hz width
are used for meteor identification, pictures with interference or
sporadic-E propagation are manually rejected.
| Counts of refl. Counts of refl. Counts of refl.
| > 30 seconds > 8 seconds > 2.5 seconds
|
| Nov 1997 Nov 1997 Nov 1997
UT| 17 18 19 17 18 19 17 18 19
---+------------- ------------ ------------
0| 0 1 14
1| 0. 2. 13
2|
3|
4| 0. 2. 13
5| 0 0 1 0 20 16
6| 1 0 7 1 27 30
7| 2 0 4 2 25 26
8| 1 0 13 2 21 20
9| 8 2 15 5 31 30
10| 10 0 23 3 36 35
11| 10 1 28 6 34 24
12| 15 1 34 4 29 40
13| 16 0 36 4 31 36
14| 18 2 37 5 30 26
15| 18 0 37 2 19 24
16| 11 0 36 6 31 34
17| 0 6 41
18|
19|
20|
21| 0 0 18
22| 0 0 15
23| 0 0 7
---+------------- ---------------- ------------
UT| 17 18 19 17 18 19 17 18 19
| Nov 1997 Nov 1997 Nov 1997
Notes:
. data reduced and remarks by Werfried Kuneth:
during the Leonids shower peak up to 5 TV video carriers showed up a few
100 Hz near each other. Only one TV video carrier was selected for
processing, this one was available for 24 hours. Sporadic-E or direct
reception appeared for 4 hours on Nov 18, after 17h UT, the Leonids peak
was without any sporadic-E signatures. Thanks to Norman Davis for sharing
the FFTDSP data with me.
Norman Davis / via Werfried Kuneth
---------------------------------------------------------------------------
Observer: Maurice De Meyere
Location: Deurle, Belgium (3 37' E, 51 00' N)
Frequency: 66.51 MHz
Transmitter locations (all stations of more than 10 kW):
66.35 MHz, Klaipeda, Lithuania 12 kW, 05h00-22h00
66.41 Siedlce Poland 39 04h57(Sun05h57)-02h00(Sat03h00)
66.47 Viesintos Lithuania 12 05h00-22h00
66.56 Poznan Poland 56 04h57(Sun05h57)-02h00(Sat03h00)
66.62 Budapest Hungary 100 24hrs
66.68 Valmiera Latvia 20 06h00-22h00
Antenna: crossed Yagi, 4 elements, astronomical azimuth 270 deg (= E),
elevation 27 deg.
Antenna amplifier: 25 dB max level 90 dBmuV
Receiver: commercial, Progresson 447A, TESLA (Bratislava)
The receiver was calibrated with a Marconi TF2008 signal
generator. Sensitivity: 5 muV (modulation frequency
1000 Hz, frequency sweep 38 kHz) at (S+N)/N = 20 dB
Observing method: automated setup, 150 samples/second, 8 bit resolution.
[Time and details of all individual meteor reflections are stored
on file in the University of Ghent format (Prometeos), and are
available for further analysis. Reduction software for DOS and
Windows available].
October 1997
Raw counts of reflections with a duration of at least 0.027 s
during one hour interval starting at UT:
Oct | UT
1997 | 20h 21 22 23 00 01 02 03 04 05 06 07
------+------------------------------------------------------------
1- 2 | 35 64 72 62 75 63 68 77 86 111 125
2- 3 | 47 42 45 46 59 77 90 89 108 99 96
3- 4 | 27 47 49 59 64 65 68 75 82 120 150
4- 5 | 45 53 53 62 54 67 76 82 100 99 87
5- 6 |
6- 7 | 21 37 46 55 47 71 69 83 89 57 80
7- 8 | 30 41 48 49 71 85 91 102 103 78 60
8- 9 | 21 30 54 70 83 72 105 91 79 125 80
9-10 | 19 41 58 73 110 93 96 106 64 110 51
10-11 | 18 38 51 53 60 71 75 58 70 75 58
11-12 | 24 28 51 49 71 61 60 76 73 78 63
12-13 | 11 16 23 29 34 38 57 83 42 40 54
13-14 | 15 27 22 40 38 45 61 54 60 97 44
14-15 | 12 27 44 58 52 56 68 66 64 48 71
15-16 | 19 39 32 50 40 75 79 77 83 81 75
16-17 | 8 27 42 61 63 68 83 68 82 114 57
------
24-25 | 31 30 23 31 46 65 67 147 97 177 97
25-26 | 7 14 25 44 51 59 81 97 88 78 83 84
26-27 | 0 28 29 42 56 65 70 68 76 84 95 90
27-28 | 3 17 19 38 29 65 64 88 101 90 130 82
28-29 | 5 21 43 35 44 39 63 73 126 97 90 69
29-30 |
30-31 | 1 18 28 24 45 54 70 76 97 84 58
31-01 | 30 21 48 51 76 62 55 102 101 112 77
------+------------------------------------------------------------
1997 | 20h 21 22 23 00 01 02 03 04 05 06 07
Oct | UT
Nov | UT
1997 | 21h 22 23 00 01 02 03 04 05 06 07 08
------+------------------------------------------------------------
1- 2 | 30 20 36 36 76 64 58 80 75 90 62
2- 3 |
3- 4 | 16 37 36 54 59 86 60 76 93 146 75
4- 5 | 22 26 33 32 56 107 137 65 101 96 58
5- 6 | 22 31 59 47 63 69 91 77 81 96 153
6- 7 | 27 48 57 63 63 70 69 96 88 93 67
7- 8 | 32 33 48 49 75 71 74 72 78 78 68
8- 9 | 40 30 31 46 61 83 69 74 91 102 95
9-10 | 19 31 41 54 66 58 80 93 80 76 82
10-11 | 11 44 31 50 85 91 73 92 103 100 69
11-12 | 29 39 43 55 90 64 125 109 139 129 113
12-13 | 28 46 49 47 50 73 110 98 101 102 97
13-14 | 33 49 58 61 75 57 94 100 92 209 -
14-15 | 25 38 41 59 77 60 87 90 114 89 115 150
15-16 | 22 56 66 81 79 91 69 102 125 145 257 103
16-17 | 29 61 70 147 113 228 253 298 445 571 547 598
17-18 | 23 79 313 87 181 155 122 154 213 307 259 223
18-19 | 36 67 56 80 64 86 141 109 134 148 139
19-20 | 28 51 64 85 97 67 109 119 122 165 125
20-21 | 37 43 64 85 86 97 98 92 107 118 164
21-22 | 34 66 65 81 101 91 106 87 126 108 97
------
26-27 | 38 39 46 53 52 67 82 91 95 117 82
27-28 | 39 40 41 47 72 96 89 107 94 103 97
28-29 | 24 45 57 50 64 92 88 93 83 102 92
29-30 | 25 44 46 84 75 90 93 91 88 101 92
30-01 | 23 27 40 70 72 86 123 139 81 139 84
------+------------------------------------------------------------
| 21h 22 23 00 01 02 03 04 05 06 07 08
Notes:
. ? probably affected by sporadic-E, direct reception.
. local time = UT + 2 hours (summer hour) until Oct 25,
local time = UT + 1 hour (winter hour) from Oct 26 onwards.
. Orionids on Oct 24.
. strong Leonids activity between Nov 16-18.
Maurice De Meyere
----------------------------------------------------------------------
Location: Astronomical Observatory, University of Ghent, Belgium
(3 42' 32" E, 51 01' 25" N)
Antenna (2x): 4 elements horizontal Yagi, pointed East, elevation= 20 deg
Antenna amplifier: 10 dB gain
Frequency: (1)=66.29 MHz (signal) and (2)=65.3 MHz (interference control)
Receiver (2x): modified commercial FM receiver
Data acquisition: 12 bits PC-based A/D convertor, 250 Hz sampling rate
Interference rejection:
dual setup: receiver (1) tuned at distant transmitter, receiver (2)
tuned at empty frequency. Anti-coincidence measurement rejects
registration of broadbanded spurious signals (lightnings, computers,
ignition motors, etc).
Further information:
see WWW page (additional info + observational data)
http://allserv.rug.acdot be/~hdejongh/astro/meteor/meteor.html
Data format:
results are shown as total reflection time, expressed as
a percentage. The actual number shows 10 times this value.
When no figure is shown, the equipment was either out of service,
or results could have been affected by interference, sporadic-E.
-----------------------------------------------------------
| Nov 1997 | 10x % reflec. time | horiz: day | vert: time |
----------------------------------------------------------------
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
---+------------------------------------------------------------
0 | 22 27 35 38 28 32 28 29 37 58 29 35 25 29 18
1 | 25 35 40 39 28 26 37 34 50 47 38 34 30 48 50
2 | 35 40 43 51 51 50 42 41 28 61 48 47 25 46 27
3 | 52 58 35 38 53 82 59 51 40 57 54 74 61 65 57
4 | 50 56 62 56 52 76 69 76 52 64 52 66 48 55 57
5 | 44 93 70 41 70 56 74 61 71 41 66 68 39 50 56
6 | 32 67 32 33 43 35 53 38 61 51 49 55 46 81 52
7 | 48 51 41 32 55 64 41 42 61 63 52 37 32 96 42
8 | 37 26 13 11 15 34 22 48 51 28 45 78 40 36 39
9 | 39 34 18 11 29 14 23 16 48 49 36 9 19 17 58
10 | 22 30 20 5 13 25 20 12 53 30 23 14 24 18 33
11 | 40 26 32 6 7 19 8 32 28 27 28 14 18 34 35
12 | 32 43 15 13 21 14 17 22 27 20 20 12 21 43 19
13 | 21 9 15 2 4 3 35 30 15 22 11 17 18 20 9
14 | 19 14 17 7 6 2 17 16 14 29 22 4 23 4 21
15 | 25 20 3 10 16 3 13 16 13 38 7 5 5 11 8
16 | 10 8 3 9 31 13 11 20 16 17 18 15 19 14 21
17 | 13 11 12 12 12 15 22 17 22 26 14 16 24 14 19
18 | 14 24 31 16 19 17 36 32 34 22 30 24 20 17 16
19 | 23 31 23 20 29 41 30 41 34 30 20 21 25 29 23
20 | 41 33 29 33 29 41 52 42 49 36 43 28 33 33 30
21 | 43 54 49 49 42 46 81 46 55 57 42 45 62 56 39
22 | 42 52 37 38 41 40 54 49 58 37 43 48 42 40
23 | 27 33 30 27 31 39 35 40 40 36 38 33 37 28 25
---+------------------------------------------------------------
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
-----------------------------------------------------------
| Nov 1997 | 10x % reflec. time | horiz: day | vert: time |
----------------------------------------------------------------
| 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
---+------------------------------------------------------------
0 | 29 89 38 46 30 30 36 25 29 37 18 26 33 26 37
1 | 32 63 59 39 37 28 54 26 42 32 24 28 32 34 34
2 | 32 56 79 48 64 34 26 31 30 31 24 29 62 29 48
3 | 52 219 113 67 60 32 49 56 67 43 36 40 47 48 36
4 | 68 236 105 76 53 49 74 79 79 45 40 44 84 54 56
5 | 88 318 98 72 59 68 59 62 41 61 29 36 53 48
6 | 123 367 154 77 39 53 52 73 45 43 53 40 75 48
7 | 154 368 104 71 62 89 58 71 49 26 26 34 46 45
8 | 77 329 61 42 31 39 45 88 52 18 20 22 51 42 39
9 | 57 191 33 35 55 26 32 43 35 26 31 34 25 38 55
10 | 39 242 28 22 50 38 26 33 17 28 31 34 32 40 43
11 | 34 135 7 24 17 23 28 29 27 24 27 13 25 24 29
12 | 28 58 4 9 26 16 22 33 21 18 8 18 20 23 26
13 | 17 90 3 16 21 8 15 45 8 14 9 11 29 28 15
14 | 17 5 13 16 7 16 13 24 15 10 6 7 10 51 21
15 | 15 7 6 12 10 20 12 21 10 6 4 7 17 41 25
16 | 17 19 20 14 15 12 14 13 12 20 15 11 6 12 9
17 | 16 10 9 20 26 12 10 24 10 13 11 14 13 40 14
18 | 17 19 12 19 20 20 12 36 7 18 8 24 11 24 22
19 | 20 27 23 26 32 21 29 65 15 20 17 22 26 34 25
20 | 37 33 39 35 34 37 29 34 29 30 28 39 41 24 34
21 | 32 27 65 36 42 47 33 38 33 28 36 43 53 42 40
22 | 52 36 46 34 43 55 35 43 34 34 35 52 45 56 47
23 | 49 31 27 47 37 30 28 41 27 30 32 43 38 32 39
---+------------------------------------------------------------
| 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Notes:
. no alpha Monocerotids (Nov 22)
. good Leonid activity between Nov 16-18, comparable to last year
. local time = UT + 1 hour
. little interference during the month of November 1997
Pierre De Groote
---------------------------------------------------------------------------
Observer: Werfried Kuneth
Location: Ferndorf, Austria (13 37' E, 46 45' N)
Antenna: 3 element Yagi, direction south, elevation 65 deg
Receiver: IC-706 at 53.76060 MHz, CW-R mode, 500 Hz CW filter, fast AGC.
Transmitters: 1) 30 kW TV video carrier from Bari, Italy, distance 700 km,
direction south 2) a 30 kW TV video carrier from Sicilia,
Italy, distance 900 km, south. Both transmitters are processed
within the same 40 Hz virtual receiver channel.
Observing method: automatic setup using FFTDSP42t software by AF9Y to record
the audio signal. 20 channels of 2 Hz width are used for meteor
identification, pictures with interference, sporadic-E, E-layer
and FAI propagation are manually rejected.
All meteor counts below are corrected for a full hour observing time. If
the recording duration is 20-40 minutes, a dot is shown after the value.
Data for less than 20 minutes observing time are not shown here.
Counts of reflections longer than 6.5 seconds: assumed to be overdense.
| Nov 1997
UT| 1 2 3 4 5 6 7 8 9 10 11 12 13 14
---+--------------------------------------------------------
0| 4 2. 2 2 4 3 0 6 0 5 5 3 0 0
1| 2 2 3 2 2 3 1 10 3 3 1 1 1 2
2| 3 1 1 5 7 1 1 4 5 3 1 2 1
3| 2 2. 4 4 2 0 4 3 7 4 2 0 1 5
4| 1 1 3 2 4 1 3 4 2 2 6 0 2 7
5| 1 1 7 0 6 0 2 4 3 3 1 1 4 2
6| 5 4 7 4 10 0 2. 2 6 0 1 0. 7 15
7| 3 5 2 2 5 7 1 3 2 3 2 6 3 6
8| 8 6 3 5 5 2 3 1 4 2 3 2 2 7
9| 1 7 7 5 8 1 5 8. 3 5 1 2 3 2
10| 5 5 4 0 3 2 2 2. 0 1 4 1 7 4.
11| 2 0 0 2 2 2 3 1 2 0 0 1 1
12| 2 3 1 3 3 0 0 2 1 1 0 5 3.
13| 0 1 3 3 1 2 1 0 2 0 3 5 2
14| 0 0. 1 3 0 0 1 4 3 2 0 0 4
15| 0 0 1 0 0 1 2 1 0 1 0. 2
16| 2 0. 0 0. 0. 0 0 1 0
17| 0 1 2 0. 2
18| 0 0. 1 0. 0 0 0
19| 0 0 2 0. 1 0 0 0
20| 0 1 7 0 4. 2 2 1 3 0 0. 4
21| 0 2 9. 0 4 0 5 2 4 0 0 2 0
22| 1 0 1 3 4 0 4 2 0 0 2 0 4 4
23| 1 0 3 2 2 0 2 4 2 3 0 1 4 2
---+--------------------------------------------------------
UT| 1 2 3 4 5 6 7 8 9 10 11 12 13 14
| Nov 1997
| Nov 1997
UT| 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
---+----------------------------------------------------------------
0| 6 4 10 6 1 3 3 2 4 5 2 0 1 5 2 4
1| 5 4 20 9 1 1 2 0 1 2 3 3 3 2 5 8
2| 4 9 11 13 2 4 7 4 2 1 1 1 4 3 10 3
3| 4 9 17 14 2 3 3 4 7 3 3 1 6 1 4 4
4| 3 9 25 17 8 5 4 5 4 2 2 4 3 6 6 3
5| 7 7 37 16 3 5 3 0 0 1 5 11 5 2 3 1
6| 4 9 38 21 7 6 6 6 3 2 3 5 4 8 7 3
7| 2. 7 38 12 3 1 4 5 0 1 3 6 4 0 0 7
8| 6 9 45. 7 10 6 4 6 3 1 1 10 2 5 4 3
9| 10 8 4 1 6 11 3 4 3 4 6 7. 2 3 3.
10| 7. 6 5 12 5 7 3 4 1 3 3. 4. 8 5. 3
11| 7 2. 1 7 3 3 5 8 1 4 2 2 2 6 3
12| 1 2. 0 3 4 6 3. 0 0. 3 3 4. 4 3.
13| 5 6 2 1 3 5 5. 3. 1 3 0 6 4 2.
14| 2. 1 1 3 5 3 0 1 1 1 0 0. 4. 8 2
15| 0 1 0. 3 0 0. 1 0 2 0 1 0
16| 0 0. 0. 0. 0 2. 0 0.
17| 0 2. 1 1 1
18| 2 2. 2. 0 0. 0
19| 0 0 0. 2. 0 0 1
20| 1 0 0 2 2 1 1 1 2 0. 1 3
21| 2 5 0 3 1 2 2 0 1 0. 0 1 2 1 4
22| 4 3 0 4 1 1 2 0 3 2 2 0 8 2 4
23| 8 4 6 4 2 0 1 1 1 1 5 1 4 5 2
---+----------------------------------------------------------------
UT| 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
| Nov 1997
Counts Counts Counts
> 13 seconds > 3.5 sec. > 0.5 sec
| Nov 1997 Nov 1997 Nov 1997
UT| 16 17 18 16 17 18 16 17 18
---+------------ ------------ ------------
0| 0 6 3 11 20 14 341 260 265
1| 1 7 4 15 37 24 356 317 261
2| 2 8 6 21 27 25 366 349 284
3| 4 10 5 16 36 31 361 379 368
4| 3 10 8 15 45 35 359 395 324
5| 4 22 9 16 51 28 283 295 244
6| 5 27 13 23 50 39 314 311 274
7| 1 24 9 9 57 24 259 248 249
8| 2 20. 4 18 70. 11 243 368.218
9| 3 2 17 13 214 202
10| 1 1 14 13 226 190
11| 0. 0 7. 8 202. 133
12| 2. 0 10. 6 176. 170
13| 2 3 1 6 13 6 147 165 119
14| 0 0 0 4 3 7 103 141 93
15| 0 0. 0 4 5. 8 90 131.111
16| 0. 0. 0. 3. 142. 90
17|
18| 0. 8. 146.
19| 0 0. 5 8. 193 190
20| 0 0 0 6 7 7 197 214 195
21| 2 0 0 9 4 9 229 202 216
22| 0 0 2 11 6 8 232 226 177
23| 1 2 2 11 7 9 232 227 187
---+------------ ------------ ------------
UT| 16 17 18 16 17 18 16 17 18
Notes:
. blank value means either few or no data available, interference,
sporadic-E or FAI propagation, or offline.
. local time conversion: 1 hour ahead of UT (05h00 UTC is 06h00 local)
. Joint report of FFTDSP observers for the Leonids 1997:
A: Austria: Werfried Kuneth, 53.7600 MHz, transmitter in south direction.
B: Italy: Giorgio Bressan (AFAM, 48.24049 MHz, transmitter in NW direction
C: California: Norman Davis, 67.2499 MHz, transmitter direction east?
The data was processed by Werfried Kuneth. I received the recordings from
three different locations, all with a similar setup for a TV video carrier.
All observers used FFTDSP42 (by AF9Y) for recordings during the Leonids
peak on November 17, 1997.
All of these recordings have been inspected using the same manual procedure
to skip images with interference and non-meteor propagation modes, and the
same software to count the individual reflections.
Observatory C: used a different integration level (5), which gave a low number
of underdense reflections. Due to this integration level I found only one
duration level that matches all observatories (making them somewhat
comparable): A: and B: counts are of reflections longer than 13 seconds, and
C: counts longer than 16 seconds. Fortunately, this count displays the
Leonid peak very well:
Station A Station B Station C
Austria Italy Ndot california
>13 seconds >13 seconds >16 seconds
| Nov 1997 Nov 1997 Nov 1997
UT| 16 17 18 16 17 18 17 18
---+-------------- ------------ ---------
0| 0 6 3 2 1
1| 1 7 4 4 2
2| 2 8 6 7 2
3| 4 10 5 4 1
4| 3 10 8 6 3 0.
5| 4 22 9 11 5 0 0
6| 5 27 13 8 6 1 0
7|. 1 24 9 23 6 3 0
8| 2 20. 4 13 5 7 0
9| 3 2 13 13 4
10|. 1 1 10 13 0
11| 0. 0 3 16 2
12| 2. 0 1 28 2
13| 2 3 1 0 25 2
14|. 0 0 0 0. 30 4
15| 0 0. 0 0. 25 1
16| 0. 0. 1 21 1
17| 0 2
18| 0. 0
19| 0 0. 0
20| 0 0 0 0 0
21| 2 0 0 0 0 0
22| 0 0 2 0 1 0
23| 1 2 2 1 4 0
---+-------------- ------------ ---------
UT| 16 17 18 16 17 18 17 18
| Nov 1997
There was no distinct peak visible, just the fireballs each hour.
Observatory C saw more, while there was a little bit more time between
meteors in Europe. Based upon these observations, the Leonids appeared as a
shower of very strong, long-duration meteor events, lasting for 14 (or more?)
hours, a population which is quite different to other meteor showers.
It is interesting that during the last 3 years it was shown that visual
observers do not see this number of fireballs (over horizon?).
In contrast to the very bright "fireball" end of the spectrum, the Leonids
seemed to show only little enhanced rates of "usual" meteors (positive
magnitudes) and faint meteors (> mag 6) in the years 1995, 1996 and 1997.
Detection of the Leonids was best with the radiant at more than 20 degrees
elevation. No indication of reduced numbers of events occurred with the
radiant overhead.
Special thanks to all who helped in this observation campaign.
Werfried Kuneth
---------------------------------------------------------------------------
Observer : Kimio Maegawa JA9BOH
Transmitter : HAM beacon (JA6YBR) (50 W Morse coded , 50.017 MHz) by
Miyazaki-University Ham Club.
Antenna: 1 lambda crossed loop, Az Omni 20 m H
Location: Miyazaki city (131.43 E, 31.82 N) NE-SW path 650 km
Receiver : IC706mk2 with high stability quartz option.
Sensitivity: -150 dBm or lower, detect 3 dB galaxy noise variation
Antenna: 4 element Yagi (10 dBi) 2 m above the ground, 0 deg elev.
Location: Sugiyama Meteor Observatory, Japan (136.1E, 35.9N) 320 m ASL
Observing method:Automatic Duty Cycle measurement every minutes by Audimate
software by Mr. Mallama of AMS above -125 dBm threshold.
[see RMOB9707 for an announcement about this software]
Time | Duty cycle(%) one hour average
JST UT | Nov 17 Nov 18 Nov 19
--------+--------------------------------
00 15 | 0.3 0.5 0.2
01 16 | 0.7 2.4 0.8
02 17 | 0.9 3.4 0.5
03 18 | 1.8 3.5 0.7
04 19 | 1.6 5.0 1.2
05 20 | 1.0 4.7 1.3
06 21 | 2.5 6.8 0.7
07 22 | 1.7 4.7 1.1
08 23 | 2.0 2.6 0.8
09 00 | 3.3 4.6 1.8
10 01 | 1.7 10.5 27.2
11 02 | 1.1 1.8 8.5
12 03 | 1.3 n/a 0.6
13 04 | 0.5 0.3 0.1
14 05 | 0.2 0.2 0.1
15 06 | 0.2 0.2 0.4
16 07 | 0.2 0.1 0.1
17 08 | 0.1 0.2 0.2
18 09 | 0.1 0.2 0.2
19 10 | 0.2 0.2 0.2
20 11 | 0.3 0.2 0.5
21 12 | 0.2 0.5 0.3
22 13 | 0.3 0.4 0.4
23 14 | 0.6 0.3 0.6
--------+--------------------------------
JST UT | Nov 17 Nov 18 Nov 19
Notes:
. local time = JST = UT + 9 hours
. Leonids Peak seemed to occur at around 6h JST or 10h JST on Nov 18.
(21h UT on Nov 17, 01h UT on Nov 18) from my observation.
. long echoes were detected from Nov 16 to 19 between 6h JST and 12h JST.
. More information on HRO (Ham band Radio meteor Observation) is available at
http://www.tcp-ip.or.jp/~kaze/rmd.htm
http://www.fukui-nct/~kmaegawa
. Duty Cycle Graph can be found at
http://www.fukui-nct.ac.jp/~kmaegawa/hro/hro.html
Kimio Maegawa
---------------------------------------------------------------------------
Observer: John Meyer
Location: Van Andel Creation Research Center, Chino Valley, AZ, USA
(112 29' 50" W, 34 50' 50" N). Elevation 1347 m above sea level.
Frequencies: 88.5, 91.1 and 91.3 MHz for signal FM receivers;
87.9 MHz (currently an unused FM frequency) for noise FM
receiver.
Transmitter locations: many possibilities including San Francisco (CA),
El Paso (TX), Carson City (NV) and Tijuana (Mexico).
Antenna: 6-element FM Yagi pointed East at 40 deg elevation.
Driven element 1.2 m above a 3.5 m square wire mash ground plane.
Antenna Amplifier: 10 dB, coax cable: 150 m of RG-8.
Receiver inputs: 10 dB pre-amplifier driving a 4-way splitter with outputs to
each receiver.
Receivers: Four OPTIMUS STA-800 FM receivers modified to 10 kHz band
width using IF amplifiers with 80 dB dynamic range signal
strength output voltages.
Data Acquisition: DATAQ type DI-190 2-channel module connected to computer
serial input port. 40 samples per second each channel.
Channel 1 is combined peak signal amplitudes from the three
signal receivers. Channel 2 is signal strength from noise
receiver. Data stored only when signal strength at antenna
exceeds -121 dBm. Storage continues for one second after signal
drops below -121 dBm. Interference rejection: data storage
inhibited if interference at noise receiver's frequency exceeds
-122 dBm at antenna. Inhibiting continues for three seconds after
noise level drops back below -122 dBm.
Data Reduction: currently semi-manual, plan to increase automation soon.
Data Format: Results are shown as total reflection time each hour,
expressed as a percentage. The actual number shows 10 times
this value. When no figure is shown, the equipment was either out
of service, or results could have contaminated by sporadic-E or
interference.
Further technical information: contact Jack Meyer (e-mail below)
------------------------------------------------------------
| Nov 1997 | 10x reflect. time | horiz: day | vert: time |
------------------------------------------------------------------------
MST| UT | 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
---+----+---------------------------------------------------------------
0 | 7 | 83 31 29 10 23
1 | 8 | 102 32 25 38 29
2 | 9 | 254 58 29 26 46
3 | 10 | 459 43 54 47 37
4 | 11 | 322 61 43 54 54
5 | 12 | 404 101 55 50 72
6 | 13 | 520 55 75 53 66
7 | 14 | 581 100 98 64 83
8 | 15 | 616 120 122 79 53
9 | 16 | 458 94 70 54 58
10 | 17 | 295 69 75 43
11 | 18 | 166 94 167* 51
12 | 19 | 67 74 598* 48
13 | 20 | 44 35 270* 50
14 | 21 | 52 43 63 21
15 | 22 | 40 44 77 46
16 | 23 | 13 35 17 13
17 | 0 | 15 25 30 22 36
18 | 1 | 27 18 22 23 32
19 | 2 | 29 58 39 45 34
20 | 3 | 30 29 41 22 39
21 | 4 | 23 34 35 43 22
22 | 5 | 10 16 26 15 23
23 | 6 | 21 17 40 25 36
---+----+---------------------------------------------------------------
MST| UT | 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Notes:
. system went into operation in current form at 1700 MST November 16.
. * increase in count Nov 19 at 1800 to 2000 UT may be sporadic-E.
John Meyer
---------------------------------------------------------------------------
Observer: Sadao Okamoto
Location: Damine Meteor Observatory, Japan (137.53 E, 35.07 N)
Transmitter: HAM beacon (JA9YDB) for RMO (50 W CW, 53.7500 MHz) by
JA9BOH Kimio Maegawa. No modulation except for identification.
Antenna: 2 element Cross Yagi 4 dBi aiming to Zenith. Omnidirectional
in azimuth and elevation above 15 deg elevation.
Location: Fukui-NCT at Sabae city (136.2 E, 35.9 N)
At present time about 10 observer are listing for
Kimio Maegawa's 53.75 MHz beacon.
Receiver: IC575 (CW mode 500 Hz IF filter)
Antenna: 2 element Yagi, pointed to the zenith
Observing method: FFTDSP software,automatic data saving and manual count.
Notes:
-: lost counts because of high noise level or machine failure.
@: Hourly rate estimated by effective observation time less than 60 min.
n: Contamination due to interference.
e: Contamination due to sporadic E opening.
f: No data available due to TX failure or maintenance
JST = UT + 9 h
Hourly echoes over 10 dB SNR (about -135 dBm)
1997
Nov|00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23
JST
Nov|15 16 17 18 19 20 21 22 23 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 UT
---+-----------------------------------------------------------------------
01 |37 29 48 35 32 44 37 28 27 n n n n n n n n 7 f f f f f f
02 |31 51 54 59 47 58 49 32 26 25 29 21 15 21 11 9 10 13 14 17 27 35 34@35
03 |30 33 40 55 52 42 52 35 43 29 27 19 16 13 17 9 15 13 9 12 21 28 40@35
04 |36 45 56 54 54 38 43 41 32 28 20 13 13 5 5 11 14 13 8 9 25 30 36@35
05 |39 40 61 56 49 44 51 34 37 28 11 15 n n 12 8 15 10 13 13 26 33 39@28
06 |32 39 52 58 52 48 57 49@34 n@18 28 23 11@10 9 10 12 10 18 24 37 42@28
07 |30 37 52 54 45 46 48 39 26 37 21 23 21 17 14 16 12 11 13 20 19 38 43 n
08 |42 34 60 49 60 44 45 36 52 45 26 n 18 22@21@17 18 8 15 18 24 44 32@40
09 |47 34 66 48 49 52 38 38 42 25 18@20@12 6 -- 10 16 8 15 24 29 41 37 --
10 |38 42 50 39 55 45 59 49 36 37 25 19 20 20 18 15 14 14 10 14 16 32 41@31
11 |38 34 47 41 55 48 43 49 32 33 29 n 17 n 8 7 7 14 14 22@29 34 30@43
12 |37 47 53 50 56 61 59 49 39 26 19 28 21 15 12 13 20 12 11 14 24 35 36@30
13 |30 39 45 37 39 42 39 41 32 31 26 23 23 18 14 11 11 13 9 13 19 31 28@25
14 |22 25 40 38 45 49 43 32 40 32 32 24 22 13 20 12 16 13 12 13 17 30 30@31
15 |26 22 39 36 51 54 47 27 34 34 28 24 20 30 16 15 10 17 18 11 21 29 30@26
16 |26 37 48 36 45 49 35@36 37 33 25 25 18 11 22 12 16 15 15 15 18 26 27
17 |29 37 33 33 36 34 34 28 22 27 28 23 14 9 14 12 8 15 6 12 22 25 24@20
18 |27 n n n@54 44 46 41 38 32 29 23 11 21 11 10 12 11 9 10 -- 38 32@43
19 | n n n n n n 44 39 46 21 n@22 17 11 7 9 12 13 13 12 25 28 35@21
20 |28 29 51 43 44 39 42 32 48 34 19 27 19 19 14 12 13 9 16 12 13 25 29@25
21 |23 28 34 54 52 24 36 39 44 35 22 32 24 16 12 17 9 10 8 10 16 28 36@31
22 |29 35 47 47 41 56 35 33 31 43 36 26 20 -- 12 16 10 15 16 23 35 30 47 --
23 |23 39 48 49 67 53 44 48@37@38 n n n n n n n 11 17 n 23 n n n
24 | n@48 47 71 49 48 53 50 33 20 27 20@16 n 15 9 8 11 11 15 22 29 32 --
25 |40 47 55 65 57 58 50 48 45 27 24 40 22 21 15 18 19 16 18 17 16 28 40@40
26 |46 45 59 53 48 59 46 40 38 32 41 22 31 32 22 19 14 13 14 9 15 25 40@38
27 |37 35 40 66 61 68 64 55 43 30 28 28 23 21 13 9 13 11 20 18 26 38 47@37
28 |46 47 46 53 67 64 60 39 30 27 29 34 24 27 15 18 13 14 9 14 26 31 43@30
29 |26 55 53 65 60 60 65 47 40 33 39 30 26 32 23 24 13 9 @7 13 26 28 36@34
30 |38 32 43 71 61 50 58 40 36 41 21 32 17 24 22 20 13 8 7 14 27 36 40@49
---+-----------------------------------------------------------------------
Nov|15 16 17 18 19 20 21 22 23 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 UT
Nov|00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23
JST
1997
Echoes with duration > 5 s
1997
Nov|00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23
JST
Nov|15 16 17 18 19 20 21 22 23 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 UT
---+-----------------------------------------------------------------------
01 | 1 2 1 3 1 3 1 3 1 1
02 | 3 4 1 2 1 3 2 2 1 1 3 2
03 | 2 1 4 3 1 1 2 4 1 1 2 3 1 1 1
04 | 2 2 1 2 1 2 3 1 2 1 2 2 5
05 | 1 3 2 3 3 5 1 2 1 2 2 1 1 1
06 | 3 1 4 1 1 2 2 1 1 1 1 1
07 | 5 1 1 1 2 1 1 3 1 1 1 1 2
08 | 1 2 1 1 1 6 1 2 2 2 2 2 1 2 2 1 1
09 | 1 2 5 3 4 1 1 1 3
10 | 2 1 2 5 1 2 6 3 1 2 2 2 1 1 1
11 | 2 2 3 1 2 3 3 4 1 2 1 1 1 1 1 1
12 | 1 1 2 5 10 2 1 4 1 1 1 1 1 1 2
13 | 1 2 1 4 3 2 2 1 1 1 1 1
14 | 2 3 1 1 3 1 4 1 1 1 2
15 | 3 2 3 2 2 3 1 2 1 1 2
16 | 2 3 3 2 1 1 2 2 3 1 2 1 2
17 | 1 1 2 3 3 4 4 2 1 7 1 2 1
18 | 2 4 5 9 9 16 17 11 8 6 3 1 3 3 4 4
19 | 3 1 3 1 2 1
20 | 1 1 1 4 4 1 3 1 2 1 1 1 1
21 | 3 3 3 1 3 4 2 2 3 2 2 2
22 | 1 1 1 1 1 1 1 1 1 1
23 | 2 1 4 2 3 1
24 | 2 1 1 1 1 1 1 3 4 1
25 | 2 1 8 1 1 3 2 3 2 1 1
26 | 1 1 2 1 4 3 1 2 2 2 2 1 1 1 1
27 | 3 3 2 3 2 4 5 1 2 1 2 1 1 1
28 | 3 2 2 3 1 2 1 1 3
29 | 1 2 5 7 4 2 2 1 2 1
30 | 1 2 4 6 2 1 1 1 2
---+--------------------------------------------------------------------------
Nov|15 16 17 18 19 20 21 22 23 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14UT
Nov|00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23
JST
1997
Daily rate of long echoes (T > 20 s)
Nov 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
---------------------------------------------------------------
Rate 2 1 2 4 4 1 0 3 0 2 1 2 0 4 5
Nov 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
---------------------------------------------------------------
Rate 6 13 41 2 3 7 1 0 3 2 3 0 2 3 0
Sadao Okamoto / via Kimio Maegawa
---------------------------------------------------------------------------
Observer: Chikara Shimoda
Location: Asahi, Nagano, Japan (137 51' E, 36 07' N)
Frequency: 81.4 MHz
Transmitter Location: FM-Japan 81.3 MHz, 10 kW, distance 180 km
Antenna: 5 element Yagi directed to the zenith.
Receiver: AM-FM Tuner (TRIO KT-1100)
Observing method: Meteor echoes output from center-tuning meter were
recorded on a pen-recorder chart.
Nov | UT
1997 | 11 12 13 14 15 16 17 18 19 20 21 22 | *(1) **(2)
-----+-------------------------------------------------+-----------
1 | 13 20 26 21 26 20 23 23 23 21 35 22 | 21.0 24.5
2 | 16 22 18 23 21 18 25 34 21 31 31 25 | 19.7 27.8
3 | 17 19 23 19 23 15 30 30 27 25 24 27 | 19.3 27.2
4 | 10 22 20 16 18 21 31 26 34 28 27 32 | 17.8 29.7
5 | 16 26 29 16 16 19 30 27 24 28 29 24 | 20.3 27.0
6 | 22 29 25 18 18 24 38 24 27 37 30 21 | 22.7 29.5
7 | 11 21 20 17 23 22 27 21 22 22 20 21 | 19.0 22.2
8 | 23 16 25 21 24 30 22 26 34 33 25 19 | 23.2 26.5
9 | 13 16 17 15 22 24 24 27 23 30 31 23 | 17.8 26.3
10 | 17 15 23 19 23 19 22 27 22 22 28 26 | 19.3 24.5
11 | 22 22 17 25 29 27 26 19 28 | 20.3 25.7
12 | 15 17 23 19 11 15 24 26 27 30 28 35 | 16.7 28.3
13 | 15 14 22 20 23 20 19 28 30 30 27 22 | 19.0 26.0
14 | 21 20 26 22 19 16 19 27 31 34 23 31 | 20.7 27.5
15 | 18 30 15 21 22 33 33 28 34 32 37 28 | 23.2 32.0
16 | 25 27 22 24 34 31 39 28 35 35 31 35 | 27.2 33.8
17 | 16 15 21 15 18 27 32 46 42 33 25 33 | 18.7 35.2
18 | 23 26 27 24 20 24 31 29 24 35 34 32 | 24.0 30.8
19 | 20 18 24 24 16 22 28 23 30 22 23 16 | 20.7 23.7
20 | 18 22 20 16 24 16 22 22 23 26 30 21 | 19.3 24.0
21 | 17 21 21 18 15 24 24 23 27 37 29 25 | 19.3 27.5
22 |
23 | 14 24 36 33 21 29 27 | 14.0 28.3
24 | 11 19 25 18 15 22 32 42 23 32 27 25 | 18.3 30.2
25 | 16 23 23 26 17 14 33 25 29 34 31 23 | 19.8 29.2
26 | 8 22 24 25 24 25 34 31 38 22 30 26 | 21.3 30.2
27 | 11 17 21 15 20 18 19 25 25 31 25 20 | 17.0 24.2
28 | 17 13 28 23 14 22 17 32 35 32 28 22 | 19.5 27.7
29 | 10 17 20 31 30 23 21 26 28 23 18 27 | 21.8 23.8
30 | 11 17 16 27 24 19 18 19 31 27 30 26 | 19.0 25.2
-----+-------------------------------------------------+-----------
1997 | 11 12 13 14 15 16 17 18 19 20 21 22 | *(1) **(2)
Nov | UT
* (1) average hourly rate between 11h -17h UT
**(2) average hourly rate between 17h -23h UT
. local time = JST = UT + 9 hours
Chikara Shimoda
---------------------------------------------------------------------------
Observer: Ilkka Yrjola
Location: Finland (26 35' E, 60 54' N)
Frequency: 87.360 MHz
Receiver: Salora SRP-22 modified, narrow band FM (B=15 kHz).
detected signal level >-122 dBm.
FM detection, no pulse noise rejection required.
Antenna: 2 element Yagi with 4 dBd gain to SW, azimuth 45 deg (SW)
Data sampling system: threshold triggering, sampling rate 64 ms.
Computer logs total hourly elapsed reflection time, number of
threshold crossings for the hour, the longest time the signal was
continuously above detection level for the hour.
Data stored in the Compact MS-Soft format. Software for viewing available
from FTP.FUNET.FI pub/ham/vhf-work/mssoft43.zip (420 K, new version!)
I have completed the facelift upgrade with the Compact MS-Soft and you may
now download the V5.0 software package from my homepage www.sci.fi/~oh5iy
Meteor counts in one hour intervals starting at:
Leonids 1997
UT | 16 Nov 17 Nov 18 Nov 19 Nov
----+----------------------------------
0 | 231 288 418 344
1 | 237 468 394 379
2 | 289 524 418 387
3 | 304 556 550 407
4 | 310 817 371 442
5 | 275 744 406 341
6 | 280 970 464 411
7 | 444 692 317 316
8 | 236 1241 376 271
9 | 216 825 263 240
10 | 278 724 356 253
11 | 333 392 232 222
12 | 193 182 218 224
13 | 168 186 187 229
14 | 142 188 178 209
15 | 125 123 215 205
16 | 191 154 192 225
17 | 138 174 218 200
18 | 203 224 202 241
19 | 219 221 222 287
20 | 209 244 321 312
21 | 223 286 322 357
22 | 321 308 356 350
23 | 332 271 351 264
----+----------------------------------
UT | 16 Nov 17 Nov 18 Nov 19 Nov
Ilkka Yrjola
---------------------------------------------------------------------------
Observer : W.T. Zanstra
Location : Appingedam, Netherlands (6 50' E, 53 19' N)
Frequency: 72.11 MHz
Transmitter Location:
Wroclaw (16 43' E, 50 52' N), Poland, 135 kW, distance 735 km
Antenna : Yagi, 5 elements, geographical azimuth 110 deg (ESE),
elevation 12 deg
Receiver : Bearcat UBC 177XLT Scanning Radio, sensitivity 0.3 uV
Observing method: listening
Forward scatter observations of Leonids and sporadic meteors in
November 1997.
Raw counts of reflections (corrected for dead time) during one
hour intervals starting at:
| November 1997 | mean sporadic background
UT | 15 16 17 18 | during 1995 and 1996
----+---------------------------------------------
00 | 65 57 | 81
01 | 59 | 86
02 | 75 | 90
03 | 61 | 92
04 | 74 | 93
05 | 88 | 92
06 | 89 | 88
07 | 78 | 85
08 | 52 61 72 53 | 80
09 | 43 56 47 59 | 73
10 | 40 37 51 43 | 67
11 | 45 | 60
12 | 42 | 52
13 | 31 | 46
| |
20 | 58 | 55
| |
22 | 55 68 | 68
23 | 68 62 | 75
----+---------------------------------------------
Note:
. during the Leonids the sporadic rate is higher than the rate of the
Leonids,
including the sporadics. This is caused by the loss of the weaker signals
during the Leonids.
Wim Zanstra / via Ton Schoenmaker
2. ABOUT THE RMOB
The RMOB is an independent initiative of some workers in the field of radio
meteor scatter observations and data reduction. It started in August 1993 in
order to spread rapidly the Perseid results via E-mail. Since then, it has
appeared monthly, and it has gradually been expanded. In regularly publishing
summaries of observations, potential radio observers are kept up to date of
existing installations, possibilities and limitations of radio meteor
observations. In the long run, there should be sufficient observing stations
to cover the whole globe, allowing to detect stream outbursts which may
remain unnoticed visually.
RMOB contains typically: summaries of recent observations, equipment data,
first results of stream activity by radio methods, relations between radio
and optical meteors, references to other publications in the field of meteor
astronomy and radio scatter techniques, announcements of meetings, short
questions and answers, non-commercial (second hand) sale of radio equipment,
available software.
Contributors are mentioned, and interested persons are asked to contact them
directly.
RMOB can be copied freely in unabridged and unmodified form. Extracts should
indicate the source (Radio Meteor Obs Bulletin, month and year).
If you want to subscribe (or un-subscribe) to the E-mail distribution list,
please send a message to C. Steyaert.
Those not having access to E-mail can obtain a printed copy free of charge
from J. Van Wassenhove (current or back-issues).
3. CONTRIBUTORS / USEFUL ADDRESSES
Enric Fraile Algeciras (EA3BTZ)
Frederic Corominas 58, Torrelles de llobregat, E-08629 Barcelona
E-mail: EA3BTZ@mx3.redestb.es
http://www.redestb.es/personal/ea3btz (in Spanish)
Michael Boschat
6306 Cork St., Apt.512, Halifax, Nova Scotia, Canada
E-mail: andromed@atm.daldot ca
Eisse Pieter Bus
Groningen, Netherlands
E-mail: epbus@worldaccessdot nl
Norman Davis WB6SHI
Shingle Springs, Ca, USA
E-mail: normd@directcondot net
Maurice De Meyere
Hullekensstraat 24, B-9831 Deurle, Belgium
tel: +32 (9) 282 35 26
Call: ON4NU, packet: on4nu@on1ced
E-mail: via Chris Steyaert
University of Ghent, Astronomical Observatory
Krijgslaan 281(S9), B-9000 Gent, Belgium
E-mail contact: Paul.Vauterin@omadot be, Pierredot deGroote@rug.acdot be
Werfried Kuneth
Ferndorf, Austria
Call: OE8FNK
E-mail: kuneth@net4you.co.at
Kimio Maegawa
Fukui National College of Technology, Electro-Information Course
Geshi, Sabae Fukui 916 JAPAN
Call:JA9BOH,JA9YDB
E-mail: kmaegawa@fukui-nct.ac.jp and/or HAG00032@niftyserve.or.jp
http://www.fukui-nct.ac.jp/~kmaegawa/hro
Alastair McBeath
IMO: International Meteor Organization
12A Prior's Walk, Morpeth, Northumberland, NE61 2RF, England, U.K.
E-mail: via Chris Steyaert
John Meyer
AZ, USA
E-mail: jrmeyer@POP.erols.com
Sadao Okamoto
E-mail: okamoto@jim.sugiyama-u.ac.jp
Chikara Shimoda
178, Hario, Asahi-mura, Higashitikuma-gun Nagano, Japan
Fax: +81-263-99-3532
E-mail: c-shimo@mtd.biglobe.ne.jp
Giovanni Sostero
Associazione Friulana di Astronomia e Meteorologia (AFAM)
E-mail: Giovanni.Sostero@elettra.triestedot it
Chris Steyaert, VVS
Kruisven 66, B-2400 Mol, Belgium
tel: +32 (14) 31 51 04
E-mail: steyaert@vvs.innetdot be
Compuserve: 72650,3513
Jeroen Van Wassenhove, VVS
's Gravenstraat 66, B-9810 Nazareth, Belgium
tel: +32 (9) 385 61 09
E-mail: 100101.734@compuserve.com
Ilkka Yrjola
Jukolantie 16, FIN-45740 Kuusankoski, Finland
E-mail: upm20.ky.yrjolil@elvi.vtkk.fi
http://www.sci.fi/~oh5iy/
Call: OH5IY, packet radio: OH5IY@OH5RBG.#KVL.FIN.EU
W.T. Zanstra
Spijkerlaan 13, 9903 BB Appingedam, Netherlands
tel: +31 (0)596 625617
Email: via tonsch@nfradot nl
--
Christian Steyaert (RMOB9711) 7 December 1997
--