[Prev][Next][Index][Thread]
(meteorobs) Radio Meteor Obs. Bull. June 1998 Bootids!
Radio Meteor Observation Bulletin No. 59 July 1998
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.
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.
| June 1998
UT | 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
----+------------------------------------------------------------
0 | 2 1 1
1 | 1 1 2 1 1 1 3
2 | 2 2 1 1 1 1 1
3 | 4 2 2 4 1 1 1 2
4 | 6 1 1 2 1 1 4 3 2 1 1
5 | 1 2 2 3 4 7 1 9 2 5 5 1 1
6 | 4 2 6 5 2 7 4 2 5 1 1 1
7 | 2 1 2 5 5 4 1 1 3 5 14 2 5 1
8 | 1 2 3 2 4 1 3 28? 3 2
9 | 4 1 1 7 9 1 2
10 | 1 16 1 24 14 5 3
11 | 1 4 2 39? 8 1 9
12 | 3 7 1 9 8 1 4
13 | 4 4 15 2 1 4 5 2 2 1 6 16 1
14 | 3 3 2 4 4 6 5 6 7 15 1
15 | 1 3 1 5 2 7 3 2 3 10 8 40? 2 2
16 | 4 6 2 4 3 4 4 3 2 1 4 18 1 4
17 | 1 1 3 3 1 4 8 16 1 4 1
18 | 2 1 19 1 1 1 2 47? 1 2
19 | 2 22 9 1 31 2 2 1
20 | 1 12 16 2 1 29
21 | 1 15 2 1 1 8 1 31?
22 | 1 2 1 2 1 2 26? 1
23 | 1 2 1 2 32?
----+------------------------------------------------------------
UT | 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
| June 1998
Notes:
. nn? possibly affected by sporadic-E or FAI.
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
June 1998
Number of meteors heard in one hour interval
1998| UT
June| 10 11 12 13 14 15 16 17
----+-------------------------------
01 | - - - - - - - -
02 | - 22 49 32 4 - - -
03 | - - - - 47 41 - -
04 | 36 60 115 119 82 39 - -
05 | 40 41 114 104 119 83 - -
06 | - 63 99 106 111 110 75 -
07 | - 25 43 11 18 - - -
08 | 17 12 28 34 59 42 45 28
09 | 7 15 64 29 18 23 - -
10 | - 16 34 48 27 - - -
11 | - 6 I I I 8 - -
12 | - - - - - - - -
13 | - 6 5 2 9 - - -
14 | - 5 9 8 10 - - -
15 | 3 - - 25 28 - - -
16 | - - - - - - - -
17 | - - - - - - - -
18 | - - - - - - - -
19 | - 4 2 - - - 5 -
20 | - 6 10 4 - - - -
|
26 | - - 7 - - - - -
27 | - 1 3 1 - - - -
----+-------------------------------
June| 10 11 12 13 14 15 16 17
1998| UT
Notes:
. no corrections for radiant position made to the counts.
. ( - ) means no observations made.
. active showers: Arietids June 7
Zeta Perseids June 13
. I = Interference
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, 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].
June 1998
Raw counts of reflections with a duration of at least 0.027 s
during one hour interval starting at UT:
Jun | UT
1998 | 20h 21 22 23 00 01 02 03 04 05 06
------+------------------------------------------------------
1- 2&| 21 33 1 2 11 10 7 8 9 11 9
2- 3 | 32 32 45 61 57 75 137 152 150 124 106
3- 4 | Es Es 59 50 47 87 116 157 174 135 126
4- 5 | 36 44 34 42 56 89 153 170 159 276? 190
5- 6 | 39 92 38 65 63 83 123 201 150 261?
6- 7 | 38 50 65 86 73 79 129 242 261 220 178
7- 8 | 28 38 55 51 69 89 174 187 174 175 134
8- 9 | 34 40 48 67 54 125 227 189 171 157
9-10 | 24 28 41 65 69 60 152 214 199 161
10-11 | 48 40 33 57 56 71 148 242 187 220
11-12 | 51 34 40 47 67 80 182 170 153 136 116
12-13 | 12 31 32 46 71 113 219 200 188 193 219
13-14 | 83? 38 44 66 71 115 153 234? 259? 258? 164
14-15 | 26 28 47 60 77 83 138 220 192 211 124
15-16 | 22 33 51 55 51 92 110 128 107 143 88
16-17 | 18 31 34 52 60 92 132 158 143 142 156
17-18 | 19 60 34 56 75 91 152 179 206 165 Es
18-19 | 28 28 23 46 101 106 152 120 115 95
19-20 | 39 39 44 66 58 79 85 134 88 Es 143
20-21 | 40 37 33 35 70 80 56 113 83 85 57
21-22 | 59
22-23 |
23-24 | 82 36 30 66 64 76 101 151 139 141 163?
24-25 | 15 28 45 25 38 58
25-26 | 39 38 30 48 66 72 81 112 136 Es Es
26-27 | 32 32 43 44 50 55 109 132 119 106 86
27-28 | 25 34 51 78 82 122 184 127 190 55
28-29 | Es 59 49 49 52 50 64 90 95 95 42
29-30 | 26 42 41 39 49 53 70 134 84 84 68
30- 1 | 21 39 53 44 96 76 103 129 115 140 71
------+------------------------------------------------------
| 20h 21 22 23 00 01 02 03 04 05 06
Raw counts of reflections with a duration of at least 1.000 s
during one hour interval starting at UT:
Jun |
1998 | 20h 21 22 23 00 01 02 03 04 05 06
------+------------------------------------------------------
1- 2&| 3 2 0 0 0 3* 1 2* 2* 0 2*
2- 3 | 3 3 1 12 9 5 27 17 33* 19 15
3- 4 | Es Es 15* 6 0 8 7 22 28 23 20
4- 5 | 2 8 4 6 10 7 31* 31 32* 126? 69*
5- 6 | 4 26* 5 4 6 11 17 29 23 105?
6- 7 | 6 5 4 11 11 5 16 43 41 29 46*
7- 8 | 1 5 10 4 4 6 24 31 22 21 18
8- 9 | 4 6 8 10 2 19 43 29 35* 32*
9-10 | 1 2 8 8 8 4 21 28 39 31
10-11 | 14* 6 3 5 6 10 16 40 27 27
11-12 | 12* 4 4 2 8 9 25 25 14 18 15
12-13 | 5* 5 1 5 11 14 29 26 35 33 55*
13-14 | 29? 6 7 9 7 15 25 66? 39? 40? 11
14-15 | 3 0 10* 12 9 8 23 42 22 24 19
15-16 | 1 3 3 7 3 12 16 11 23* 26 19*
16-17 | 6* 2 1 10 10 9 17 35* 16 26 23
17-18 | 1 21* 3 8 10 12 30 33 36 25 Es
18-19 | 6* 7* 7* 3 16 10 12 17 23 17
19-20 | 7 6 13* 20* 6 4 9 13 14 Es 36
20-21 | 13* 5 5 4 16* 18* 5 12 15 17 11
21-22 | 15*
22-23 |
23-24 | 23* 6 2 8 6 8 16 36* 42* 48* 42?
24-25 | 2 5 11* 2 4 5
25-26 | 8* 1 6 1 11 9 9 11 41* Es Es
26-27 | 3 4 7 8 2 3 16 21 24* 28* 20
27-28 | 4 1 8 12 11 17 28 27* 59* 9
28-29 | Es 11 4 5 7 2 8 14 17 26* 1
29-30 | 3 13* 2 4 3 2 9 19 12 12 13
30-01 | 5* 5 8 2 7 7 16 22 14 25 10
------+------------------------------------------------------
| 20h 21 22 23 00 01 02 03 04 05 06
Notes:
. ? probably affected by sporadic-E, direct reception.
. local time = UT + 2 hours.
. thunderstorms on June 5, 21, 22, and 25.
. hardware or software problem on June 22-23
. * warning for relative high number of long duration reflections,
an indication for potential stream activity.
. & test on June 1 with antenna inclination of 35 degr, which dramatically
reduced the number of reflections (and hopefully also the amount of
interference)
. June Bootids activity on June 27-28
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 (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.
-------------------------------------------------------------
| Jun 1998 | 10x % reflec. time | horiz: day | vert: time UT|
----------------------------------------------------------------
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
---+------------------------------------------------------------
0 | 36 36 26 40 23 25 32 16 33 22 26 25 34 46 33
1 | 38 59 61 67 35 48 25 26 31 46 35 36 93 62 36
2 | 52 49 55 63 90 48 37 44 58 52 44 75 201 83 67
3 | 58 71 81 94 125 95 100 56 103 83 86 60 146 133 102
4 | 59 65 76 117 66 56 69 91 83 108 78 56 147 178 103
5 | 98 85 98 108 85 54 92 137 123 103 127 75 158 150 137
6 | 68 122 95 100 96 132 150 111 144 127 121 102 182 173 114
7 | 66 84 107 118 82 123 125 111 114 99 109 89 214 184 77
8 | 106 79 105 67 78 53 143 93 119 125 116 75 195 194 88
9 | 83 70 87 44 32 118 95 148 103 84 82 195 178 88
10 | 69 94 59 36 20 97 65 151 87 62 62 152 146 43
11 | 46 51 108 42 25 8 65 58 63 57 45 42 102 105 34
12 | 27 60 20 12 12 119 50 34 43 23 20 91 51 23
13 | 25 22 29 50 120 36 36 33 31 21 44 65 11
14 | 22 27 16 28 37 27 23 28 34 22 44 49 11
15 | 35 21 30 20 18 42 25 30 17 35 30 67 35 25
16 | 11 16 15 13 10 21 18 10 17 26 39 20 13
17 | 11 11 8 9 8 7 6 13 12 8 17
18 | 17 9 9 19 13 10 6 27 8 19 21 15 19
19 | 13 10 26 48 11 8 9 7 7 9 20 14 10
20 | 12 15 23 8 25 17 10 13 8 13 9 19 13 20
21 | 13 12 9 9 15 15 12 9 17 11 18 19 14 16
22 | 20 19 24 11 16 16 12 12 10 12 18 17 20 32 21
23 | 23 38 21 20 16 20 15 20 15 21 19 27 40 27 34
---+------------------------------------------------------------
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
-------------------------------------------------------------
| Jun 1998 | 10x % reflec. time | horiz: day | vert: time UT|
----------------------------------------------------------------
| 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
---+------------------------------------------------------------
0 | 35 37 45 26 37 54 40 35 40 33 43 43 60 54 39
1 | 73 45 51 67 42 58 51 45 46 48 43 72 79 53 65
2 | 54 44 64 74 67 57 82 51 100 65 53 136 70 52 60
3 | 88 65 107 93 100 81 105 85 120 94 106 139 142 99 76
4 | 88 71 105 91 88 131 113 70 84 94 67 136 177 85 93
5 | 124 131 100 96 116 123 85 92 118 100 112 162 183 102 95
6 | 151 101 124 125 117 95 84 94 91 112 183 133 136 80
7 | 80 77 71 86 56 71 76 89 70 58 142 126 58 68
8 | 47 82 114 78 125 81 72 72 73 157 132 76 51
9 | 39 42 57 109 83 62 42 64 66 148 157 47 71
10 | 38 39 67 82 46 49 55 54 141 111 46 58
11 | 17 20 31 96 51 40 20 19 40 129 84 30 41
12 | 10 13 15 15 84 23 20 26 22 16 16 112 51 48 31
13 | 13 21 19 12 39 25 13 11 7 14 31 71 43 19 27
14 | 18 16 22 9 19 9 19 16 19 45 25 21 19
15 | 13 14 35 20 24 35 24 19 21 37 21 21 26
16 | 16 8 12 15 20 17 16 16 67 34 17 12
17 | 6 10 11 14 20 8 14 16 57 22 21 13
18 | 15 8 12 13 9 12 19 9 12 8
19 | 8 8 15 25 12 5 15 14 18 35 16 10
20 | 13 11 18 26 18 19 13 21 24 36 50 13
21 | 16 14 22 17 15 58 19 18 17 19 21 19 18 23 26
22 | 20 14 22 13 19 32 31 24 22 20 28 26 34 25 21
23 | 33 21 21 31 27 31 45 35 25 28 33 53 39 36 33
---+------------------------------------------------------------
| 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30
Notes:
. the unexpected June Bootids activity can be seen from June 27, 1h UT
to June 28, 12h UT.
The dip in the maximum activity centered on 7h UT gives roughly
a Right Ascension of 205 deg for the radiant (lower than any of the
visually estimated values) and a declination of at least 45 deg.
The low velocity and the resulting zenith attraction cannot be neglected
in this case. Estimation by Chris Steyaert using the FORWARD program.
Pierre De Groote
---------------------------------------------------------------------------
Observer: Will Kelsey
Location: Santa Maria, CA, USA (120 26'9" W, 34 55'38" N)
Frequency: 106.9 MHz
Transmitter Location: KEAR FM San Francisco, CA, distance 352 km
Antenna: Yagi FM 6 element, heading NNW.
Receiver: Sangean 803A
Observing Method: Listening to audio.
Underdense/Overdense Scale:
C-Dense: 0.5 second or less
B-Dense: 0.5 to 3.0 seconds
X-Dense: 3.0 seconds or more
Estimated Signal Amplitude (ESA): 1 to 99 maximum
Interference (INT): Lo Med Hi
Each observation hour is recorded in three 20 minute intervals
______________________________________________________________________
June
1998 hr-UT X-Dense B-Dense C-Dense ESA INT Total
----------------------------------------------------------------------
1 1000-1100 2-4-1 2-1-0 40 Med 10
3 1100-1200 1-0-0 1-3-3 3-5-5 43 Lo 21
4 " 2-2-1 2-2-3 50 None 12
5 1000-1100 1-4-0 3-2-2 66 Med 12
6 1400-1500 1-2-2 2-0-2 56 " 9
7 1200-1300 1-0-0 4-7-3 5-4-4 43 None 28
8 " 5-4-3 5-4-3 63 " 24
9 " 1-4-7 4-3-7 54 Lo 26
10 1230-1330 2-4-2 3-4-4 47 None 19
11 1200-1300 0-1-0 2-5-1 6-5-3 61 " 23
12 " 3-0-2 0-1-2 38 Lo 8
13 1500-1600 1-0-0 7-5-1 10-5-1 60 Lo 30
14 " 1-0-0 1-2-3 4-1-3 33 None 15
15 1200-1300 1-0-0 1-2-2 5-4-2 35 " 17
16 " 1-1-2 6-1-3 43 " 14
17 1000-1100 3-3-0 2-3-4 20 " 15
18 1400-1500 2-3-2 2-2-5 38 Lo 16
19 1200-1300 4-1-3 3-2-5 72 None 18
20 " 2-2-1 4-0-0 55 Lo 9
21 " 4-1-2 2-1-2 42 None 12
22 1400-1500 0-1-0 1-2-2 4-2-3 53 Lo 15
23 1400-1300 4-3-3 7-1-3 38 Lo 21
24 1200-1300 0-1-0 1-2-3 5-0-2 41 Lo 14
25 " 2-1-1 1-2-2 22 None 9
26 1100-1200 0-2-0 1-3-1 43 None 7
27 1200-1300 5-8-2 8-2-6 61 Med 31
28 " 1-3-2 1-3-3 40 Med 15
29 " 0-5-4 2-3-4 61 None 18
30 1200-1300 3-1-0 2-4-5 33 None 15
----------------------------------------------------------------------
1998 hr-UT X-Dense B-Dense C-Dense ESA INT Total
June
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, pictures with interference, sporadic-E, E-layer
and FAI propagation are manually rejected. Sampling interval: one
4096 point FFT every 0.5 seconds.
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 3.5 seconds:
| June 1998
UT| 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
---+-----------------------------------------------------------------------
0| 10 3 3 2 5 7 10 7. 4 4 4 8 3 2 5 4 1
1| 8 6 3 7 7 8 5 6 6 11 5 3. 5 12 7 5 4 3
2| 8 6 7 8 7 10 14 14 5 15 11 10 8 8 4 1 7 5
3| 14 15 11 7 13 18 9 20 13 15 14 14 19 7 6 9 16 6
4| 22 14 15 16 14 22 25 18 15 8 11 14 5 10 16 8 10 8
5| 21 30 22 21 20 26 22 12 27 15 21 21 26 14 13 7 8 10
6| 22 30 24 25 22 33 29 11 24 19 23 24 13 12 11 9
7| 32 28 27 22 25 26. 20 18 21 13 20. 20 14 9 8 3
8| 16 24 19 24 13 24. 9 12 13 14 25 10 11 9 7 6
9| 16 18 23 21 14 23 11 10 11 10 10 11 1 1
10| 13 22 27 23 13 16 7 18 16 10 4. 9. 4 7. 8 6 2
11| 21 17 21 12 11 20 12 15 13 11 16. 8 11 10. 8 5
12| 16 17 25 13 13 17 10. 13 7 12 8 6 11 6 13
13| 15 15 8 23 5 9 6 8 17 16 13 6 8 8 8
14| 13 5 12 3 5 2. 8 10 7. 5. 6 0 4
15| 3. 2 1 1 3 4 9. 6 1 0 0 6 3 5
16| 0 3. 2 7 3 3 5. 2 12 2 2. 3 7
17| 1 1 0. 3 0 5 1 0. 2. 3 3 2 1 6
18| 1 0 0 1 4. 3 2 3 2 5 1 0 1 2 0
19| 1 1 1 7. 2. 1 1 6 1 3 1 1 0 3. 1 2
20| 2. 2 5. 7 4 4 2. 4 3 3 0 3 3 1
21| 5 4 4 0 1 5 4 5 0 6. 5 0 2 1 0
22| 11 1 2 1 9. 3 4 6 5. 2 7 1 0 3
23| 7 6. 1 3 4 3 5 4 4 7. 4 5 1 3 1 2
---+-----------------------------------------------------------------------
UT| 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
| June 1998
Please note that I made a change in recording level on June 26, showing much
more meteors after that time. So the above table is consistent, as well as
the following one:
| June 98
UT| 26 27 28 29 30
---+-------------------
0| 10.*28 7 21
1| *29 8 25
2| *31 9 19
3| 24 19 21
4| 22 17 17
5| 21. 15 16 19
6| 20 27 20 27
7| 33 29 17 32
8| 28 15 13 21
9| 24 8 11 24
10| 18 13 15 17
11| *27 31. 21
12| *41. 21 27
13| *31 29 19
14| *41 16 12 18.
15| *33 8. 6 6
16| 10 10 4 7
17| 6. 10 10 4 2
18| 0 4 1 0
19| 2 3. 6 4 5
20| 4 5. 7 8
21| 5 8 17 8 5
22| 6 *21 16 10 18
23| 15 *34 5 11 10
---+-------------------
UT| 26 27 28 29 30
| June 1998
Propagation overview for June 1998
E : Sporadic-E or E-layer propagation
F : FAI (field aligned irregularity)
- : Propagation only via meteor echos.
| June 1998
UT| 1 2 3 4 5 6 7 8 9101112131415161718192021222324252627282930
---+------------------------------------------------------------
0| - F F - - - F - - - - - - - - E - - - - - - - - - -
1| - - - - - - - - - - - - - E - F - - - - - - - - -
2| - - - - - - - - - - - - - - E - - - - - - - - - -
3| - - - - - - - - - - - - - - E - - - - - - - - - -
4| - - - - - - - - - - - - E - - E - - - - - - - - - -
5| - - E - - - - - - - - - - - - E E - - - - - - - - - -
6| - - E - E - - - - - - - - - - E - - - - - - - - - -
7| - E - - E E - - - - - - - - - E F E E - - - - - - -
8| - E - E E - - - - - E - - - - E E - - - - - - - - -
9| - E E E E - - - - - E - - - - - E - E - - - - - - -
10| - E E E E E - - - - - - E - - E E - E - - - - E - -
11| - E E E - - - - - - - - - - - E - - - E - - - - - E
12| - E E E - - - - - - - - - - - E - - - E - - - - - -
13| - E E - - - - - - - - - - E E - - - - - - - - -
14| - - E E - E - - - - - - - - E - E - - - - - - - E
15| - - - E E - - - - - - - - - - - - - - - - - - -
16| - - - - E - - - - - - - - - - - - E E E - - - -
17| - - - - E - - - - - - - - - - - - - - - E E - - - - -
18| - - E E E - - - - E - F - - - - - - - E E - - E - - -
19| E F E E F E - - - E F - F - E F - - - - E - - - E - - F
20| E F E E F E - E - F F - F F E F - - - - - - E - E - F F
21| E F E - - F - - - F - - F E E F - - - E - E - F F F E
22| E F E - - F - - - - - - - E E F - - - - - E - - F - E
23| E F - - - E - - - - - - - E E - - - - - - - E - - F
---+------------------------------------------------------------
UT| 1 2 3 4 5 6 7 8 9101112131415161718192021222324252627282930
| June 1998
Notes:
. no other correction except for "dead time" is used in the counts shown.
. local time conversion: 2 hour ahead of UT (04h00 UTC is 06h00 local)
. outburst of the June Bootids on June 27 and June 28, marked with "*"
. lots of sporadic-e and FAI propagation throughout June. Contrary to
May 1998, this month showed often continuous openings for several hours,
which led to reduced meteor count recording time.
Werfried Kuneth
---------------------------------------------------------------------------
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.
June | UT
1998 | 11 12 13 14 15 16 17 18 19 20 21 22 | *(1) **(2)
------+-------------------------------------------------+-----------
1 | 14 10 15 19 20 22 20 16 | 16.7 18.0
2 | 6 19 21 14 17 16 28 27 32 37 30 38 | 15.5 32.0
3 | 7 13 18 25 16 17 19 16 38 42 41 40 | 16.0 32.7
4 | 12 18 19 21 25 15 24 26 36 39 36 34 | 18.3 32.5
5 | 13 18 18 32 20 24 28 25 35 47 41 30 | 20.8 34.3
6 | 8 18 26 19 30 16 21 27 35 44 45 38 | 19.5 35.0
7 | 9 16 10 21 17 18 36 49 57 48 | 15.2 47.5
8 | 11 11 26 27 24 17 30 35 38 48 49 42 | 19.3 40.3
9 | 7 15 27 20 29 29 45 27 47 43 53 47 | 21.2 43.7
10 | 10 15 17 19 28 28 22 52 41 65 58 40 | 19.5 46.3
11 | 9 14 20 22 35 20 30 25 51 50 46 38 | 20.0 40.0
12 | 11 21 28 31 27 30 27 25 38 65 43 31 | 24.7 38.2
13 | 11 18 30 32 30 30 28 43 50 57 35 | 24.2 40.5
14 | 9 16 25 23 22 29 34 23 41 48 54 33 | 20.7 38.8
15 | 5 11 19 18 26 22 20 29 39 46 29 32 | 16.8 32.5
16 | 23 19 16 22 20 19 35 50 41 32 | 20.0 32.8
17 | 10 12 16 18 23 22 28 30 34 51 39 27 | 16.8 34.8
18 | 4 15 17 24 27 25 23 39 44 33 44 26 | 18.7 34.8
19 | 14 18 32 36 32 20 31 40 41 45 | 25.3 39.3
20 | 12 21 30 33 25 | 24.2
21 | 12 18 31 31 27 24 44 36 | 23.8 40.0
22 | 14 18 24 32 21 22 24 22 24 38 40 38 | 21.8 31.0
23 | 8 18 23 28 26 28 40 31 33 35 38 28 | 21.8 34.2
24 | 18 12 20 27 18 25 24 24 29 40 34 31 | 20.0 30.3
25 | 22 24 26 26 19 37 40 37 39 32 | 24.5 34.0
26 | 16 10 27 32 31 43 35 26 33 30 34 29 | 26.5 31.2
27 | 11 20 30 32 48 39 45 60 50 61 39 39 | 30.0 49.0
28 | 5 19 17 25 30 27 29 24 36 50 36 34 | 20.5 34.8
29 | 5 17 18 17 25 32 30 33 36 38 27 31 | 19.0 32.5
30 | 10 12 15 19 20 22 24 23 19 26 | 16.3 23.0
------+-------------------------------------------------+-----------
1998 | 11 12 13 14 15 16 17 18 19 20 21 22 | *(1) **(2)
June | UT
* (1) average hourly rate between 11h-17h UT
**(2) average hourly rate between 17h-23h UT
. local time = JST = UT + 9 hours
. Pons-Winneckids? outburst on June 27
Chikara Shimoda
---------------------------------------------------------------------------
Observer: Ilkka Yrjola
Location: Finland (26 35' E, 60 54' N)
Frequency: 88.8 MHz
Some of the transmitters, or one of them, shuts down for the night
and this causes a dip in the counts.
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).
You can download the V5.0 software package from my homepage
www.sci.fi/~oh5iy
eta Aquarids 1998
Meteor counts in one hour intervals starting at:
UT | 3 May 4 May 5 May 6 May
----+----------------------------------
0 | 244 129 214 232
1 | 193 267 246 253
2 | 178 271 290 254
3 | 188 345 447
4 | 294 427 418
5 | 431 530
6 | 571 449
7 | 373 410 549 631
8 | 521 589 591 278
9 | 315 324 437
10 | 190 210 233
11 | 177 181 171
12 | 177 218 227 162
13 | 272 205 156 225
14 | 90 129 117
15 | 92 122 88 112
16 | 130 59 82 94
17 | 66 50 105
18 | 60 59 66 66
19 | 78 77 84 71
20 | 108 94 104 123
21 | 109 101 112 133
22 | 103 126 216 156
23 | 118 190 210 171
----+----------------------------------
UT | 3 May 4 May 5 May 6 May
. Aurora on May 4 and 5, sporadic E on May 5
Arietids and zeta Perseids 1998
Meteor counts in one hour intervals starting at:
UT | 5 Jun 6 Jun 7 Jun 8 Jun 9 Jun 10 Jun 11 Jun
----+------------------------------------------------------------
0 | 265 281 367 299 195 218 290
1 | 382 336 316 351 251 454 397
2 | 319 448 402 600 493 518 447
3 | 462 553 461 806 612 603 778
4 | 692 770 483 814 721 760 836
5 | 650 865 738 987 898 837 771
6 | 708 951 728 891 892 783 699
7 | 719 766 906 932 766 770 742
8 | 585 727 596 678 539 571 506
9 | 409 525 477 390 359 431 391
10 | 369 332 384 239 223 297 275
11 | 363 382 367 315 263 253 208
12 | 439 532 493 716 492 560 519
13 | 490 556 516 596 535 586 676
14 | 421 455 497 541 374 455 461
15 | 309 235 353 256 339 347 362
16 | 185 178 293 202 183 174 189
17 | 114 153 152 117 102 155 127
18 | 118 162 87 70 131 107
19 | 94 119 138 87 142 96
20 | 127 150 175 123 139 114 123
21 | 157 143 166 126 168 149 214
22 | 222 176 300 175 191 148 209
23 | 207 254 236 232 164 189 227
----+------------------------------------------------------------
UT | 5 Jun 6 Jun 7 Jun 8 Jun 9 Jun 10 Jun 11 Jun
. sporadic E on June 6
Ilkka Yrjola
2. ANNOUNCEMENT
IAU Circular No. 6954 mentioned visual and radio observations in Japan
on June 27.5-25.7 of a stream with radiant between eta UMa and alpha Boo.
On June 29, Peter Jenniskens, President IAU C-22 Pro-Amat Working Group,
gave a fuller account of the observations so far, including European visual
observations. More observations appeared on the meteorobs and IMO mailing
lists. Radio amateurs reported also activity on the VHFDX mailing list, not
necessarily recognizing the nature of the increased activity.
It looks that this unexpected stream of slow meteors (14 km/s) was active
at a level comparable to the maximum of the better streams (such as the
Geminids) from early hours UT of June 27 to midday June 28 UT.
3. 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).
4. 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
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
H. W. Kelsey, A.L.P.O.
Santa Maria, CA, USA
E-mail: 73073.1464@compuserve.com
Werfried Kuneth
Ferndorf, Austria
E-mail: kuneth@net4you.co.at
Alastair McBeath
IMO: International Meteor Organization
12A Prior's Walk, Morpeth, Northumberland, NE61 2RF, England, U.K.
E-mail: via Chris Steyaert
Chikara Shimoda
178, Hario, Asahi-mura, Higashitikuma-gun Nagano, Japan
Fax: +81-263-99-3532
E-mail: c-shimo@mtd.biglobe.ne.jp
JN Homepage http://www2s.biglobe.ne.jp/~JN-/index.html
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 home: oh5iy@sci.fi
http://www.sci.fi/~oh5iy/
Call: OH5IY, packet radio: OH5IY@OH5RBG.#KVL.FIN.EU
--
Christian Steyaert (RMOB9806) 7 July 1998
--