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(meteorobs) Radio Meteor Obs. Bull. April 1999 Lyrids
Radio Meteor Observation Bulletin No. 69 May 1999
1. FORWARD SCATTER METEOR OBSERVATIONS
Observer: Enric Fraile Algeciras
Location: Paseo Bonanova, 8 Barcelona (02 07'E, 41 24' N)
Frequency: 48.24715 MHz.
Transmitter Location: still working to identify, possibly South German C2,
100 kW, horizontal polarisation)
Antenna: 6-element Yagi 617-6B, 14 dBd gain.
astronomical azimuth 215 deg (=NE), elevation 0 deg.
Antenna: Six element Yagi 617-6B, 14 dBi gain, horizontal polariz.
Azimuth 200 deg (NE), elevation 20 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 (500 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 1 second/18 sampling interval
to store all the > 0.5 s reflections.
| Apr 1999
UT | 1 2 3 4 5 6 7 13 14 15 16 17 18 21 22 23
----+--------------------------------------------------------------------
0 | 6 1 6 2 4 1 2 1 3 3 5 1 4 2 3
1 | 4 5 9 3 3 3 4 0 1 3 2 1 5 6 6
2 | 3 3 3 4 2 4 3 2 3 3 3 1 1 6 8
3 | 3 3 3 3 3 2 4 2 0 1 3 1 1 2 2
4 | 2 0 0 4 3 1 3 0 2 3 0 1 2 1 1
5 | 2 1 4 5 3 2 2 0 4 3 1 0 2 4 1
6 | 2 2 3 0 4 2 1 3 1 3 5 1 6 7 3
7 | 6 1 2 2 5 3 1 4 3 0 2 2 4 4 3
8 | 2 10 5 8 5 2 2 4 2 0 1 1 9 8 2
9 | 3 7 5 3 4 5 5 4 0 1 0 3 3 4 5
10 | 7 4 4 3 2 3 3 2 3 1 1 3 3 11
11 | 5 7 5 2 4 7 4 0 0 2 0 4 2 5
12 | 1 4 2 3 11 4 7 0 0 0 0 2 5 2
13 | 0 3 3 1 1 1 1 0 0 0 0 2 0 1
14 | 0 1 1 1 1 2 1 0 0 0 1 0 1
15 | 0 1 4 2 2 1 0 1 3 0 1 2 2
16 | 1 0 2 1 1 1 1 0 0 0 0 0
17 | 2 3 1 0 2 2 1 0 0 0 0 2
18 | 2 2 1 0 0 5 2 0 2 0 0 1 1
19 | 0 1 1 2 1 2 0 0 0 1 0 4 1
20 | 1 3 2 2 0 0 2 1 1 0 0 6 1
21 | 1 2 3 2 0 3 1 1 2 0 0 1 2
22 | 2 4 2 0 2 0 1 2 1 1 0 0 4
23 | 1 7 3 4 3 0 2 2 0 0 1 7 5
----+--------------------------------------------------------------------
UT | 1 2 3 4 5 6 7 13 14 15 16 17 18 21 22 23
| Apr 1999
Notes:
. the system has been adjusted to detect overdense reflections and minimize
local interference.
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: Icom R-10
Antenna : resonant dipole
Antenna Direction: Horizontally polarized with lobes in E-W plane, elev 0 deg
Filter : high-Q (Q at least 300) bandpass filter between antenna & receiver.
Listening Mode: AM
Recording method: listening by ear
April 1999
Number of meteors heard in one hour interval
| UT
Apr | 09 10 11 12 13 14 15 16 17 18 19 20
----+-----------------------------------------------
1 | - - - - 3 6 9 5* - - - -
2 | - - - - - - - - - - - -
3 | - - - - - 7 5 3 2 - - -
4 | - - - - - - - - - - - -
5 | - 6 4 - - - - - - - - -
6 | - - 2+ 11 12 25 9+ 11 - - - -
7 | - - # # 5* - - - - - - -
8 | - - - - - - - - - - - 4
9 | - - - 2 5 22 15* 4* - - - -
10 | 1 3 4 - - - - - - - - -
11 | - - - - - - - - - - - -
12 | - - 3# 2# 2# 40 39 25 20 24 - -
13 | - - 18* 11* 10* - - - - - - -
14 | - - - - - - - - - - - -
15 | - - 10 15 37 13* 17 11 4 - - -
16 | - - - 9 7 - - - - - - -
17 | - - - - - - - - - - - -
18 | - - - - - - - - - - - -
19 | 5+ 6* 6* 5* 12* 10* - - - - - -
20 | - - - - - - - - - - - -
21 | - - - 3 4 - 2 21 - - - -
22 | 11 20 46 39 29 13 - - - - - -
23 | - - 25 36 44 24 27 18 - - - -
24 | - 9 17* 36 22* - 12 - - - - -
25 | - - 9 14 14 20 8 - - - - -
26 | - - - - - - - - - - - -
27 | - 11 27 26 41 25 23 - - - - -
28 | - 8 4 5 - - - - - - - -
29 | - - - - - - - - - - - -
30 | - - - 5 8 - - - - - - -
31 | - - - - - - - - - - - -
----+-----------------------------------------------
Apr | 09 10 11 12 13 14 15 16 17 18 19 20
| UT
| UT
Apr | 00 01 02 03 04 05 06 07 08
----+-----------------------------------
22 | - - - - - - - 8 2
23 | - - 8 7 - - - - -
----+-----------------------------------
| 00 01 02 03 04 05 06 07 08
Notes:
. no corrections for radiant position made to the counts.
. ( - ) means no observations made.
. * = Interference
. # = Strong interference of unknown source
. + = 1/2 hour observation only.
Mike Boschat
---------------------------------------------------------------------------
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
66.47 Viesintos Lithuania 12 05h00-22h00
66.62 Budapest Hungary 100 24hrs
66.68 Valmiera Latvia 20 04h30-22h00
Antenna: crossed Yagi (x form), 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.
SWR of antenna alone at 66.5 MHz: 1.4/1 (good to very good),
measured with MFJ/259P SWR analyzer (HF-VHF 1.8 MHz to 170 MHz)
on Sep 28, 1998.
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].
April 1999
Raw counts of reflections with a duration of at least 0.027 s
during one hour interval starting at UT:
Apr | UT
1999 | 20h 21 22 23 00 01 02 03 04 05 06
------+-------------------------------------------------------
1- 2 | 29 23 29 29 29 42 28 35 55 45 38
2- 3 | ? 34 25 69 27 33 44 26 29 43 -
3- 4 | - 37 29 32 32 34 34 25 40 50 39
4- 5 | ? 55 59 ? 36 39 40 31 34 38 29
5- 6 | 51 33 63 ? 49 36 27 36 44 ? ?
6- 7 |
7- 8 | 28 35 30 25 32 35 26 44 37 ?
8- 9 | ? ? ? ? 42 30 24 23 41 ? ?
9-10 | ? 47 25 45 41 36 21 36 40 ?
10-11 | 27 29 43 29 31 25 29 24 27 37 47
11-12 | 37 27 29 36 25 21 49 29 35 31
12-13 | 20 25 20 23 30 17 19 21 17 42 27
13-14 | 29 25 25 26 35 31 26 29 27 71 57
14-15 | 22 41 33 28 29 35 39 38 41 71 ?
15-16 | 46 33 34 41 28 46 52 53 39 42 51
16-17 | ? 45 50 34 31 48 52 68 64 ? 61
17-18 | 23 30 37 34 52 44 35 46 46 45 62
18-19 | 25 18 39 52 31 24 33 34 60 52 63
19-20 | 30 26 32 36 39 43 49 55 44 47 67
20-21 | 20 26 21 23 34 34 29 33 31 29 21
------+-------------------------------------------------------
1999 | 20h 21 22 23 00 01 02 03 04 05 06
Apr | UT
Raw counts of reflections with a duration of at least 1.000 s
during one hour interval starting at UT:
Apr | UT
1999 | 20h 21 22 23 00 01 02 03 04 05 06
------+-------------------------------------------------------
1- 2 | 10* 4 3 2 1 1 3 5 9 8 6
2- 3 | ? 8* 3 ? 2 4 5 1 3 10* -
3- 4 | - 11* 0 3 0 4 8* 1 3 4 2
4- 5 | ? ? ? ? 1 4 2 0 3 6 1
5- 6 | 6 11* ? ? ? 1 4 2 12* ? ?
6- 7 |
7- 8 | 4 5 3 2 5 2 3 7 5 13
8- 9 | ? ? 10* ? 5 3 5* 1 ? ? ?
9-10 | ? 10* 7* 5 8 3 3 2 6 ?
10-11 | 10* 7* 7 7* 5 4 1 3 2 4 6
11-12 | 7 8* 9* 5 0 2 8 0 1 1
12-13 | 5* 4 4 3 2 2 2 3 1 3 4
13-14 | 12? 3 3 4 3 3 5 3 1 ? 10
14-15 | 3 7 7* 7* 5 5 6 3 3 ? ?
15-16 | 8 13* 4 4 2 4 5 5 6 3 13*
16-17 | ? 7 7 5 2 5 ? 8 9 ? 9
17-18 | 4 7* 2 5 9 3 4 12* 4 2 11
18-19 | 1 3 5 11* 0 1 2 1 6 5 4
19-20 | 6 2 5 5 2 1 7 6 7 3 ?
20-21 | 2 5 4 3 8* 13* 1 5 10* 1 5*
------+-------------------------------------------------------
1999 | 20h 21 22 23 00 01 02 03 04 05 06
Apr | UT
Notes:
. further hardware modifications: from April 30 onwards, only low pass
filter between receiver and A/D convertor.
. ? probably affected by sporadic-E, tropo, direct reception.
. * warning for relative high number of long duration reflections,
an indication for potential stream activity.
. local time = UT + 2 hours
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
smallband resonance lambda/4 antenna filter
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 (lightning, 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.
--------------------------------------------------------------
| Apr 1999 | 10x % reflec. time | horiz: day | vert: time UT |
-----------------------------------------------------------------
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
---+------------------------------------------------------------
0 | 25 23 20 24 35 22 11 16 17 17 14 13 20 16
1 | 36 26 27 25 25 19 21 18 20 16 15 19 18 6
2 | 26 28 32 23 33 27 21 29 43 20 23 37 22 36
3 | 20 38 39 54 42 38 39 39 47 33 30 28 30 30
4 | 29 38 30 34 24 53 33 36 53 91 36 31 23 44
5 | 57 45 51 35 57 39 30 27 45 47 39 29 38 19
6 | 55 32 36 40 32 30 52 41 38 49 42 51 32 38
7 | 27 47 44 55 45 48 38 67 58 47 31 34 23 19
8 | 24 31 53 53 41 29 63 48 38 60 75 37 38 19 19
9 | 26 16 44 45 49 38 59 30 23 55 55 17 22 36 43
10 | 33 24 47 43 60 39 52 38 16 34 47 29 21 21 26
11 | 19 24 52 55 36 32 31 25 20 31 48 15 24 16 20
12 | 17 23 39 20 24 19 19 29 18 27 36 11 26 6 15
13 | 14 37 26 22 16 16 13 15 26 16 24 10 11 7 8
14 | 49 19 25 25 18 14 6 18 17 23 16 9 8 5 10
15 | 6 10 11 12 13 10 7 2 68 10 25 8 4 10 6
16 | 3 58 6 6 7 10 11 10 4 7 8 6 6 3 6
17 | 2 11 7 11 6 11 6 11 5 7 7 8 6 8 3
18 | 4 7 10 16 9 7 9 5 10 7 7 8 6 6 5
19 | 6 12 13 11 10 11 10 8 12 10 8 9 5 5 13
20 | 9 19 11 12 19 21 10 10 16 16 19 7 16 8 26
21 | 12 15 36 19 18 14 10 8 16 22 7 9 16 17 4
22 | 11 11 23 12 11 14 10 12 16 9 9 9 8 5 3
23 | 12 14 17 18 20 19 10 10 11 13 9 6 10 6 8
---+------------------------------------------------------------
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
--------------------------------------------------------------
| Apr 1999 | 10x % reflec. time | horiz: day | vert: time UT |
-----------------------------------------------------------------
| 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
---+------------------------------------------------------------
0 | 18 12 21 10 17 22 41 50 31 32 27 21 22 31 29
1 | 11 21 20 29 19 29 49 76 29 32 24 43 25 33 33
2 | 25 19 20 22 40 34 55 76 26 40 41 42 35 42 46
3 | 24 34 63 23 63 55 82 157 64 70 56 52 67 79 83
4 | 24 39 45 52 48 88 125 162 59 53 57 57 58 57 74
5 | 44 33 37 31 47 56 110 142 79 70 46 60 96 108 55
6 | 33 54 29 24 44 68 86 74 87 41 44 80 47 75 83
7 | 22 43 54 30 32 73 122 104 81 69 66 58 59 70 55
8 | 35 22 53 38 52 69 83 65 98 82 32 57 109 59 58
9 | 25 39 76 49 55 46 93 50 74 64 36 58 60 42 48
10 | 36 36 45 18 35 42 61 38 77 61 47 64 61 33 71
11 | 21 29 41 20 21 42 39 37 59 57 35 35 68 26 41
12 | 24 27 24 15 26 37 21 21 50 42 28 42 28 20 17
13 | 10 21 14 12 15 26 16 24 34 30 17 23 28 22 27
14 | 22 14 17 12 18 13 10 14 17 13 9 17 24 13 16
15 | 8 6 15 11 10 15 8 16 11 20 10 25 15 8 10
16 | 4 7 9 9 10 5 11 12 8 13 13 12 14 23 10
17 | 17 6 5 3 4 6 20 15 8 8 14 6 13 12 12
18 | 17 8 11 19 11 11 17 13 6 18 11 11 8 16 8
19 | 5 6 7 18 9 22 48 14 10 13 16 13 9 13 9
20 | 10 8 6 10 16 21 33 17 15 15 13 13 21 8 20
21 | 8 6 9 13 19 15 33 18 25 16 17 10 24 12 8
22 | 7 7 5 9 21 15 27 21 17 9 18 13 5 8 8
23 | 5 13 12 10 12 24 38 25 21 19 19 18 13 13 11
---+------------------------------------------------------------
| 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Note:
. a suitable new location in and on top of the university building has
been found, in time for the April Lyrids.
. Lyrids maximum during the morning hours of April 23, 1999.
Pierre De Groote
---------------------------------------------------------------------------
Observer: Will Kelsey
Location: Santa Maria, CA. USA (120 26' 9" W, 34 55' 58" N)
Frequency: 107.9 MHz
Transmitter Location: Sacramento, CA. KXOA FM, 50 kW at 362 km.
Antenna: Yagi FM 6 element. Heading North
Receiver: Sangean 803 A
Observing Method: Audio Tape.
Underdense/Overdense Scale:
Overdense: 1.0 second or more duration
Underdense: less than 1.0 second duration
Each observed hour is 60 minutes, exactly.
__________________________________________________
April Over- Under-
1999 hr-UT dense dense Total
--------------------------------------------------
1 VIR/DPA 1100-1200 7 30 37
2 " " 10 18 28
3 " 1055-1155 6 18 24
5 " 1050-1150 4 9 13
6 " 1045-1145 6 23 29
7 " 1040-1140 7 23 30
8 " 1035-1135 12 12 24
9 " 1030-1130 9 35 44
10 " 1025-1125 9 20 29
11 " 1020-1120 3 10 13
12 " 1015-1115 8 35 43
13 " 1010-1110 7 22 29
14 " 1005-1105 10 18 28
15 " 1000-1100 2 12 14
16 LYR 0900-1000 7 11 18
17 " 0855-0955 10 19 29
18 " 0850-0950 6 9 15
19 " 0845-0945 9 16 25
20 " 0840-0940 5 12 17
21 " 0835-0935 9 10 19
22 " 0835-0935 12 21 33
--------------------------------------------------
1999 hr-UT Over- Under- Total
April dense dense
Notes:
. activity period of streams with radiant at 45 deg elevation:
VIR: Virginids
DPA: Delta Pavonids
LYR: Lyrids
Will Kelsey
---------------------------------------------------------------------------
Observer: Werfried Kuneth
Location: Ferndorf, Austria (13 37' E, 46 45' N)
Antenna: 2 element Yagi, direction southeast, no elevation at 1m height.
Receiver: IC-706 at 53.76065 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 and 2) a 30 kW TV video carrier from Sicilia,
Italy, distance 900 km, south. The total echo power of both
transmitters is processed into 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, another channel is used for automatic
interference rejection. Sampling interval: one 4096
point FFT every 0.5 seconds.
The monthly results are now also available at http://www.qsldot net/oe8fnk
The 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, to
show the reduced accuracy. Results for less than 20 min. observing time are
excluded.
Counts of reflections longer than 6.5 seconds,
assumed to be overdense.
| Apr 1999
UT| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
---+-----------------------------------------------------------
0| 0 1 1 0 0 0 2 1 1 0 1 2 3 1
1| 1 0 1 0 0 0 0 0 0 2 0 0 3 3
2| 0 0 2 1 2 1 1 0 1 1 1 1 3 2
3| 4 5 1 1 2 2 6 2 0 3 2 0 0 3
4| 0 0 1 4 2 0 1 3 4 0 2 2 0 4
5| 3 0 0 0 3 0 2 4 4 7 3 5 3
6| 1 3 3 2 6 2 1 2 2 3 2 5 4
7| 2 1 3 2 5 5 10 5 6 3 3 2 5
8| 1 2 1 4 4 3 1 2 3 5 3 6 5
9| 0 4 3 4 0 2 5 4 4 4 4 1 7 3
10| 1 1 2 0 3 0 8 2 4 6 4 1 6 3
11| 0 0 2 1 0 1 2 0 2 2 5 1 3 3
12| 3 1 4 3 2 3 1 0 3 1 0 1 0 2
13| 0 4 0 0 3 2 4 1 1 0 4 2 1 3
14| 2 3 2 1 1 0 5 1 3 3 1 3 1
15| 0 1 1 0 1 2 0 1 0 1 0 3 1
16| 1 3 0 0 0 3 0 0 2 0 0 0 0 2
17| 1 0. 1 0 0 0 0 0 1 0 0. 0 0 0
18| 0 1 0 0 1 0 0 0 0 0 0 0 0 1
19| 0 0 0 0 0 1 0 0 0 0 0 1 1 0
20| 0 1 0 1 0 0 0 1 1 0 0 0 0 0
21| 0 0 0 2 0 0 1 0 0 0 1 1 0 0
22| 0 2 0 1 2 0 1 0 1 0 0 0 1 3
23| 1 0 1 0 1 1 1 0 1 0 0 1 4 2
---+-----------------------------------------------------------
UT| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
| Apr 1999
| Apr 1999
UT| 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
---+-----------------------------------------------------------
0| 1 1 2 0 2 3 4 4 2 2 0 2 2 1 2
1| 0 1 1 2 0 3 4 13 4 4 2 0 2 5 3
2| 2 2 1 2 2 4 7 2 5 2 2 1 3 3 3
3| 0 2 1 3 4 3 7 9 2 0 0 5 3 1 3
4| 3 1 3 2 6 2 4 6 6 7 6 6 3 6 6
5| 7 4 8 4 7 8 15 16 7 1 4 3 6 2 7
6| 4 4. 3 3 3 10 12 10 7 7 4 6 9 10 10
7| 2 7. 2 0 8 3 11 10 6 1 5 7 7 10 8
8| 8 2 3 4 8 7 13 6 6 4 7 7 10 14 7
9| 4 1 5 8 4 9 7 7 7 6 3 4 10 11 6
10| 8 1 2 3 4 4 8 6 4 3 6 7 5 9 6
11| 3 1 4 4 3 3 2 6 2 1 6 9 4 10 0
12| 8 0 3 2 3 3 3 5 2 3 1 4 4 4 3
13| 3 1 6 4 4 1 3 7 1 4 2 7 2 4 2
14| 2 3 2 0 3 0 3 4 0 2 1 3 0 2 5
15| 0 0 0 0 1 1 2 1 3 1 0 0 2 1 2
16| 1 0 1 0 1 1 0 1 1 0 2 0 0 0 2
17| 0 3 0 0 0 0 1 0 0 0 0 3 0 1 1
18| 1 1 1 2 0 0 0 0 1 1 1 0 0 1 1
19| 1 1 0 0 1 0 2 1 1 0 1 1 1 1 0
20| 0 1 1 1 1 0 0 2 0 1 1 2 0 1 0
21| 1 0 0 1 1 1 2 0 1 1 0 3 1 1 1
22| 0 0 3 1 1 1 3 1 0 0 1 2 2 3 1
23| 1 2 4 4 2 2 3 1 3 0 0 2 2 4 3
---+-----------------------------------------------------------
UT| 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
| Apr 1999
Propagation overview for April 1999
E : sporadic-E or E-layer propagation
F : FAI (field aligned irregularity)
- : propagation only via meteor echoes.
(blank) : no data available
| Apr 1999
UT| 1 2 3 4 5 6 7 8 9101112131415161718192021222324252627282930
---+------------------------------------------------------------
0| - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
1| - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
2| - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
3| - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
4| - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
5| - - - - - - - - - - - - - - - - - - - - - - - - - - - -
6| - - - - - - - - - - - - - - - E - - E - - - - - - - - -
7| - - - - - - - - - - - - - - - - - - - - E - - - - - - -
8| - - - - - - - - - - - - - - - - - - - - - - - - - - - -
9| - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
10| - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
11| - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
12| - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
13| - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
14| - - - - - - - - - - - - - - - - - - - - - - - - - - - -
15| - - - - - - - - - - - - - - - - - - - - - - - - - - - -
16| - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
17| - - - - - - - - - - - - - - - - F - - - - - - - - - - - -
18| - - - - - - - - - - - - - F - - F - - - - - - - - - - - -
19| - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
20| - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
21| - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
22| - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
23| - - - - - - - - - - - - - - - - - - - - E - - - - - - - -
---+------------------------------------------------------------
UT| 1 2 3 4 5 6 7 8 9101112131415161718192021222324252627282930
| Apr 1999
Notes:
. the Lyrids showed up well during April 20-23.
. the low values of April 24 to 27 are not due to receiving
equipment problems.
Werfried Kuneth
---------------------------------------------------------------------------
Observer: R.B. Minton
Location: Raton, NM (104 26' W, 36 54' N, 2000 m above sea level)
Frequency: 92.9 MHz
Transmitters: KTZA FM 100 kW, Artesia NM, dist 444 km, geogr azim 178 deg
KSPZ FM 53 kW, Color. Springs, dist 217 km, geogr azim 352 deg
KYBR FM ? kW, Espanola NM, dist 180 km, geogr azim 236 deg
???? FM ? kW, Juarez Mexico, dist 579 km, geogr azim 198 deg
Antenna: folded dipole, on 6.3 m high mast, oriented N-S
Receiver: Subaru 12 V DC car radio with digital tuning
Observing method: conditioned audio input in the game port of an IBM 386 SX-50
PC, 128 samples/second, DOS/Basic software
Total hourly counts
(interference manually deleted)
March 1999
Mar| UT
1999| 0h 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
----+------------------------------------------------------------------------
1 | 23 20 28 19 25 13 18 18 14 15 21 12 7 10 14 25 38 40 32 17 20 17 19 24
2 | 24 14 14 15 11 10 10 7 16 9 13 15 9 12 12 31 53 31 31 18 17 11 8 15
3 | 10 8 6 10 16 18 14 11 8 4 1 5 1 6 1 23 34 34 32 20 21 29 18 29
4 | 20 14 16 23 23 30 19 23 13 16 18 14 19 16 17 17 32 32 34 35 34 18 19 32
5 | 20 16 21 20 26 23 11 33 18 13 14 23 14 14 17 30 45 45 40 36 27 33 24 17
6 | 20 11 23 10 18 20 16 7 24 12 11 17 10 11 24 17 35 26 33 18 22 20 16 18
7 | 20 12 18 7 19 5 16 24 14 13 14 16 9 10 18 24 34 29 35 37 25 29 15 24
8 | 12 13 11 15 8 16 11 23 18 23 6 11 10 11 18 7 0 21 20 18 11 2 6 14
9 | 5 1 7 21 24 25 12 14 15 16 6 15 7 21 22 28 46 31 29 25 21 17 16 20
10 | 32 11 4 12 24 22 12 24 17 14 16 22 14 22 16 26 42 27 36 20 7 23 23 7
11 | 25 20 16 14 23 18 15 12 22 4 9 12 9 15 21 19 0 3 12 5 10 5 22 40
12 | 26 22 0 3 31 24 14 12 14 11 13 15 21 11 17 12 44 35 35 35 26 26 35 53
13 | 28 22 20 22 17 26 21 15 20 15 7 8 13 13 14 20 25 47 26 22 15 19 17 23
14 | 20 20 21 20 26 7 11 10 25 11 10 12 11 14 14 20 25 24 9 12 6 0 3 0
15 | 8 8 6 4 3 9 23 7 12 16 14 5 9 15 15 7 0 0 0 24 10 18 16 15
16 | 13 5 17 16 21 18 12 14 14 12 16 20 15 9 11 0 0 5 21 26 25 19 23 26
17 | 20 23 17 16 18 23 20 9 17 5 17 19 12 18 10 21 42 26 22 17 17 25 25 23
18 | 26 15 29 20 24 24 17 14 26 11 24 14 6 6 6 30 43 28 33 16 27 26 31 30
19 | 28 14 15 17 11 22 17 17 22 11 17 6 0 0 0 0 0 0 0 0 0 0 1 22
20 | 13 10 23 11 12 16 7 5 12 11 7 18 3 14 10 21 34 25 24 10 18 11 16 13
21 | 13 16 24 12 11 10 7 10 8 11 4 9 9 10 11 23 27 23 22 18 12 15 24 25
22 | 12 15 22 17 16 11 9 9 9 6 6 1 9 10 7 9 27 27 23 9 7 10 14 12
23 | 19 12 18 8 17 17 11 13 5 10 9 14 5 5 7 20 23 7 0 9 9 5 11 19
24 | 18 17 18 14 29 23 10 10 7 6 6 11 9 7 6 4 16 20 24 12 18 6 10 19
25 | 15 13 24 14 18 19 10 10 7 9 12 15 11 5 14 20 23 23 26 17 16 15 20 18
26 | 14 14 12 11 13 19 16 3 11 8 11 6 4 7 10 10 23 20 24 13 14 16 16 26
27 | 11 8 15 15 16 18 11 9 10 7 7 11 11 8 7 12 25 9 5 9 18 12 20 17
28 | 18 18 12 22 14 14 9 9 11 6 8 5 10 8 15 15 28 30 21 22 19 19 24 20
29 | 21 20 21 27 20 6 15 15 15 6 2 3 2 29 15 19 15 17 19 20 13 13 16 18
30 | 12 10 19 17 20 18 14 13 15 19 3 12 43 22 27 29 37 25 24 25 15 11 19 25
31 | 17 8 17 7 13 6 8 8 4 11 0 0 9 11 8 28 25 26 40 11 19 9 17 31
----+------------------------------------------------------------------------
1999| 0h 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
Mar| UT
Signal duration distribution for the above period
Duration (s) Number
< 0.1 3285
0.1 to 0.3 2770
0.3 to 1 2090
1 to 3 1886
3 to 10 1601
10 to 30 475
> 30 17
R.B. Minton
---------------------------------------------------------------------------
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. Omni-directional
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 observers are listing for
Kimio Maegawa's 53.75 MHz beacon.
Receiver: IC575
Antenna: 2 element Yagi, pointed to the zenith.
Observing method: FFTDSP software, manual count.
Hourly echoes over 10 dB SNR
1999
Apr|00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23JST
Apr|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|24 28 25 20 31 29 34 33 37 26 33 15 21 14 n n n n n@13 18 20 31 --
02|20 32 19 31 25 27 24 27 32 36 45 22 26@24 n n n e 6 5 14 15 27@25
03|21 25 21 23 28 32 31 30@23 n n n n@10 8 5 5 n @6@12 15 23 23@29
04|25 22 23 32 18 34 31 36 41 36 36 20 23 17 12 11 8 8 7 10 12 20 29@24
05|39 23 29 28 26 32 31 40 42 24 30@15 n n n 11 n n @6 4 11 16 23@27
06|36 26 19 19 16 31 34 41 42 40 29 28 24 32 15 12 n @4 10 8 14 19 17@21
07|29 24 21 32 25 19 33 38 25 29 19 16 13@10 n n n n n 8 10 9 17@18
08|15 21 20 21 18 25 26 16 27 19 n n n n n n n n @6 3 9 21 29@19
09|32 25 25 29 34 31 25 27 24 23 n n n n n 6 9 7 5 6 13 14 20@32
10|25 37 30 27 32 31 34 37 41@38@27 30 28 26 12 15 13 6 9 11 9 24 26 --
11|46 28 27 26 36 26 29 29 45 34 30 19 12 25 19 15 9 5 7 10 11 28 26@33
12|27 29 31 31 23 23 28 37 28 35 29 30 21 25 17 22 14 4 12 9 21 14 24@23
13|35 24 27 26 22 27 37 28 45 34 31 32 11@15 n 11 17 n n 3 n n 16@28
14|27 e 17 21 19 33 31 29 42 28 11 10 16 11 13 6 4 6 2 6 7 10 23@30
15|32 35 27 19 24 27 39 28 26 15 10 14 15 10 10 11 10 5 4 4 13 14 19@20
16|23 31 27 30 21 27 30 32 32 23 11 18 10 24 12 14 @6 11 5 11 19 9 31@29
17|32 24 36 31 21 32 38 28 28 18 12 13 18 24 12 11@15 7 9 8 7 18 18@20
18|29 18 22 26 23 22 30 40 31 24 28 29 25 19@18 20@14 4 4 9 12 15 28@20
19|22 24 22 27 24 26 26 33 36 41 30 25 30 34 18 14 8 5 3 7 14 21 26@30
20|24 30 28 22 18 26 33 43 43 34 28 20 16 e e 18 13 10 6 11 13 19 18@32
21|25 29 24 21 26 24 33 36 31 22 26 24 22 18 13 16 8 8 5 10 9 24 24@21
22|26 23 32 19 27 35 42 44 38 30 35 23 23 17 10 e e 10 8 4 9 14 23@32
23|36 40 44 28 29 31 43 50 52 34 23 27 26 29 26 14 n 7 7 8 7 17 38@34
24|39 34 32 37 36 28 41 43 37 26 26 32@24 34 19 19 18 8 8 12 10 21 15 --
25|28 27 35 27 27 39 38 31 30 22 25 16 16 27 17 15 8 4 6 5 6 23 22@31
26|26 28 19 23 32 35 34 31 31 20 30 15 29 45 22 12 9 11 8 8 16 23 23@34
27|29 27 29 21 28 37 36 44 37 29 31 27 34 30 20 15 @7 6 6 12 16 27 23@29
28|32 25 23 25 34 34 41 35 35 36 22 27 n n 19 15 15 3 2 3 11 15 20@14
29|27 23 25 20 34 37 32 31 18 15 11 13 11 7@13 n n 7 2 9 14 19 22@24
30|26 28 22 26 28 40 46 29 33 33 21 21 16 12 11 11 9 5 4 10 8 16 22@26
---+-------------------------------------------------------------------------
- Apr|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 Apr|00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21
22 23JST 1999
Echoes with duration > 5 s
1999
Apr|00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23JST
Apr|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 1 3 1 1 1
02| 1 1 1 1 4 3 3 3 1 2 1 1
03| 1 1 2 2 2 3 2 1 1
04| 2 3 2 2 5 6 1 1 1 1 1 2 1
05| 1 1 2 4 1 3 1 4 1 1
06| 2 1 2 2 2 3 3 1
07| 1 3 2 3 2 1 2 1 1
08| 1 3 3 5 3 1 1 1 1
09| 2 2 1 2 2 2 2 1
10| 1 4 1 3 3 2 4 2 3 1 1
11| 2 5 3 2 1 1
12| 1 2 1 2 2 1
13| 2 2 3 4 1 1 2 1 1
14| 1 2 2 1 2 1
15| 2 1 1 2 1 2
16| 1 2 3 1 1 4 1 1
17| 1 1 2 2 1 1 1 2 1 1 1
18| 1 2 2 1 1 2 2 3 1 1 2 1
19| 1 2 4 3 1 3 1 2 1 1 2 2 1
20| 1 1 2 1 2 1 4 7 6 1 1 1 1 2
21| 2 1 3 2 2 4 3 4 2 1 1 2
22| 2 5 2 6 3 6 3 1 2 1 1 1 3
23| 5 6 6 3 2 7 8 10 2 1 4 1 4 1 2 1 3
24| 2 5 6 8 3 4 4 3 6 1 1 7 1 1 2 2 1 2 --
25| 5 2 2 7 2 1 3 1 3 1 4 2
26| 1 2 4 1 2 3 2 1 1 1 1 1 1 1
27| 1 1 1 5 3 3 2 2 2
28| 1 1 1 1 2 4 5 5 4 2 3 1 1 1
29| 2 2 3 4 3 3 1 1 1 2
30| 4 3 5 2 2 2 1 1
---+-------------------------------------------------------------------------
- Apr|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 Apr|00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21
22 23JST 1999
Daily rate of long echoes (T > 20 s)
1999
Apr 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
---------------------------------------------------------------
Count 1 2 1 3 2 1 1 3 1 1 2 1 2 0 1
Apr 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
---------------------------------------------------------------
Count 0 2 3 2 5 4 4 7 6 6 0 2 1 1 0
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 radio noise.
e: contamination due to sporadic E opening.
f: no data available due to TX or RX failure.
JST = UT + 9 hours
. the activity of the April-Lyrids was from April 20 to April 25,
and was comparable to the activities of the previous years.
Sadao Okamoto
---------------------------------------------------------------------------
Observer: Ilkka Yrjola
Location: Finland (26 35' E, 60 54' N)
Frequency: 88.8 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-el. Yagi, G=4 dBd to SW, azimuth 45 deg (SW), polarisation H.
Data sampling system: threshold triggering, sampling rate 32 ms.
Computer logs total hourly elapsed reflection time, number of
triggers for the hour, the longest time the signal was
continuously above detection level for the hour.
Data on major showers available in the Compact MS-Soft format.
Software for viewing available from
www.saunalahti.fi/~oh5iy/radio50.zip (754 K).
Lyrids 1999
Meteor counts in one hour intervals starting at:
UT | 21 Apr 22 Apr 23 Apr 24 Apr
----+----------------------------------
0 | 128 169 352 141
1 | 160 161 219 169
2 | 180 182 185 141
3 | 239 284 521 296
4 | 190 269 618 208
5 | 310 329 535 319
6 | 277 513 624 433
7 | 580 494 764 392
8 | 233 472 605 510
9 | 277 626 484 341
10 | 325 452 307 247
11 | 181 291 321 254
12 | 128 294 276 193
13 | 121 252 211 213
14 | 159 181 249 150
15 | 185 167 129
16 | 96 163 131 76
17 | 56 233 201 108
18 | 67 253 121 93
19 | 187 223 76 111
20 | 146 306 163 152
21 | 135 243 139 104
22 | 212 240 133 169
23 | 205 362 123 96
----+----------------------------------
UT | 21 Apr 22 Apr 23 Apr 24 Apr
Note:
The scaling factors have been re-estimated per Dec. 1998 data from 29 days
and compared to monthly averages since 1993. This did indicate some need to
adjust the count and time parameter by some +15...20% to keep the curves
comparable to the older ones.
Ilkka Yrjola
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)
C/ Moianes 19-21 Esc. A 6º 1ª, E 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
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@izar.rug.acdot be, Pierredot deGroote@rug.acdot be
H. W. Kelsey, A.L.P.O.
Santa Maria, CA, USA
E-mail: 73073.1464@compuserve.com
Werfried Kuneth
Ferndorf, Austria
E-mail: kuneth@netway.at
http://www.qsldot net/oe8fnk
Alastair McBeath
IMO: International Meteor Organization
12A Prior's Walk, Morpeth, Northumberland, NE61 2RF, England, U.K.
E-mail: via Chris Steyaert
R.B. Minton
Astrometric Observatory
568 North First Street, Raton, NM 87740, USA
tel: +001 (505) 445 7009
Sadao Okamoto
E-mail: okamoto@jim.sugiyama-u.ac.jp
Martín Semegone
Asociación Argentina Amigos de la Astronomía (AAAA)
Doblas 118 P.2, Dto. 3, 1424 Capital Federal, Argentina
E-Mail: juanmar@labint.frba.utndot edu.ar
Chris Steyaert, VVS
Kruisven 66, B-2400 Mol, Belgium
tel: +32 (14) 31 51 04
E-mail: steyaert@vvsdot 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 home: oh5iy@sci.fi
http://www.sci.fi/~oh5iy/
Call: OH5IY, packet radio: OH5IY@OH5RBG.#KVL.FIN.EU
--
Christian Steyaert (RMOB9904) 8 May 1999
--
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