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(meteorobs) Radio Meteor Obs. Bull. Aug 1997 Perseids
Radio Meteor Observation Bulletin No. 49 September 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.
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.
Perseids
| Aug 1997
UT | 10 11 12 13
---+----------------
0 | 56 * 102 257
1 | 49 * 276 237
2 | 69 * 191 234
3 | 71 115 216 208
4 | 102 192 210 251
5 | 124 155 184 278
6 | 132 130 289 298
7 | 158 134 314 300
8 | 110 126 383 261
9 | 105 154 327 177
10 | 113 74 259 171
11 | 79 65 155 137
12 | 55 69 176 178
13 | 56 61 277 95
14 | 70 48 231 111
15 | 46 24 204 59
16 | 59 33 121 57
17 | 63 37 53 67
18 | 183? 50 62 79
19 | 46 38 67 71
20 | 65 49 101 56
21 | 88 89 75 92
22 | 81 68 134 101
23 | * 132 176 92
---+----------------
UT | 10 11 12 13
| Aug 1997
. * thunderstorm
. ? probably affected by sporadic-E, direct reception
Enric Fraile Algeciras
---------------------------------------------------------------------------
Observer: Eisse Pieter 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 177XLT Scanning Radio, sensitivity: 0.5 uV
Observation method: Listening and counting in 5-minute intervals.
Mean "sporadic" activity of long-duration reflections >1 second,
between 1997 July 6 and 1997 August 3.
Between brackets the statistical error of one-sigma (n-1).
Starting at UT:
6h00m 6h30m 7h00m 7h30m 8h00m 8h30 9h00m 9h30m
-------------------------------------------------------------
10(2) 10(1) 7(1) 8(1) 6(2) 7(1) 6(2) 7(1)
Mean "sporadic" activity between 1997 July 5 and 1997 August 2.
Between brackets the statistical error of one sigma (n-1).
Starting at UT:
16h00m 16h30m 17h00m 17h30m 18h00m 18h30m 19h00m 19h30m
-------------------------------------------------------------
37(8) 36(4) 36(6) 36(5) 37(6) 42(6) 45(4) 49(8)
Uncorrected counts of long-duration reflections >1 second.
Between brackets the total reflection-time in minutes.
Starting at UT:
|6h00m 6h30m 7h00m 7h30m 8h00m 8h30m 9h00m 9h30m
----------+------------------------------------------------------
August 11 | 13 15 11 15 11 - 10 15
1997 12 | 16 24 19 25 33 21 17 15
| (1.0) (4.1) (10.5) (12.8) (13.6) (7.6) (6.0) (5.6)
13 | 23 19 18 18 13 13 14 21
Uncorrected counts on 1997 August 12.
Between brackets the total reflection-time in minutes.
Starting at UT:
16h00m 16h30m 17h00m 17h30m 18h00m 18h30m 19h00m 19h30m
---------------------------------------------------------------
63(3.3) 67(1.1) 68(0.9) 76(0.8) 89(1.6) 72(2.9) 74(0.7) 68(1.6)
Peter Bus
---------------------------------------------------------------------------
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].
August 1997
Raw counts of reflections with a duration of at least 0.027 s
during one hour interval starting at UT:
Aug | UT
1997 | 20h 21 22 23 00 01 02 03 04 05 06
------+-------------------------------------------------------
1- 2 |
2- 3 | 67 99 96 125 199 175 195 203 156 103 80
3- 4 | 63 105 128 123 143 213 187 189 266 172 86
4- 5 | 67 71 130 164 201 178 203 170 200 147 174
5- 6 | 70 147 117 138 131 168 207 203 185 164 118
6- 7 | 71 104 119 142 166 195 200 239 215 222 137
7- 8 | 99 109 134 139 177 207 181 197 175 127 113
8- 9 | 101 91 117 152 203 209 209 260 290 278 283
9-10 | - 107 144 142 219 299 278 236 218 194 129
10-11 | 114 126 165 209 277 211 206 233 254 279 148
11-12 | 132 165 206 199 235 352 281 269 289 272 358
12-13 | 262 224 230 247 277 261 292 241 219 167 230
13-14 | 117 281 165 182 185 242 225 187 194 187 129
14-15 | 92 36 6 1 2 1 2 6 179 178 4
15-16 | 69 110 124 132 116 121 149 162 156 409 278
16-17 | 40 84 111 111 128 135 162 152 97 105 79
17-18 | 56 131 94 97 136 142 163 149 113 129 123
18-19 | 83 121 114 136 131 116 207 149 121 147 103
19-20 | 37 73 86 88 124 129 126 122 118 108 105
20-21 | 38 100 96 89 91 99 132 147 115 166 183
21-22 | 22 29 49 76 87 86 85 85 84 59 276
22-23 |
23-24 | 37 49 83 96 97 100 98 122 136 114 76
24-25 |
25-26 |
26-27 | 78 60 80 77 100 98 108 118 142 118 142?
27-28 |
28-29 |
29-30 | - 33 45 66 76 76 89 93 112 114 86
30-31 | 20 39 50 90 86 71 78 88 103 133 64
31-01 | 39 45 75 80 72 121 147 104 133 173 119
------+-------------------------------------------------------
1997 | 20h 21 22 23 00 01 02 03 04 05 06
Aug | UT
Aug | UT
1997 | 07h 08 09 10 11 12 13 14 15 16 17
------+------------------------------------------------------
11 | 297 - - 113 85 200? 50 93 115 60 123
12 | 594 - 226 179 138 194 353? 109 128 84 106
13 | 434? - 507? 385? 259? 193 159 156 216 183 116
------+------------------------------------------------------
1997 | 07h 08 09 10 11 12 13 14 15 16 17
Aug | UT
Notes:
. highest Perseid activity on Aug 12, 6-8h UT
. & sporadic-E, direct reception.
. Aug 14-15: transmitter failure?
. thunderstorms on Aug 24-26
. ? probably affected by sporadic-E, direct reception
. 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
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.
-----------------------------------------------------------
| Aug 1997 | 10x % reflec. time | horiz: day | vert: time |
----------------------------------------------------------------
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
---+------------------------------------------------------------
0 | 87 66 79 77 126 46 39 65 72 75 76 140 125 85 47
1 | 88 77 122 102 107 69 102 58 79 139 66 171 114 143 87
2 | 189 109 134 119 94 75 75 78 134 88 152 232 164 152 71
3 | 169 132 186 120 96 123 142 86 95 70 150 257 230 121 111
4 | 119 119 106 125 138 97 105 103 143 96 108 308 252 177 185
5 | 94 140 87 85 102 60 119 53 72 110 99 213 119 124 73
6 | 65 102 143 64 87 81 89 115 124 76 80 219 166 78 90
7 | 97 92 73 55 100 58 83 47 55 41 61 30 86 63
8 | 55 99 44 90 46 61 26 81 16 49 61
9 | 44 78 104 39 72 50 66 31 26 43 65
10 | 29 58 40 29 25 56 47 46 68 54 104
11 | 27 63 20 8 37 64 34 61 98 54
12 | 24 23 12 36 20 37 44 35 58 83
13 | 13 21 81 70 16 44 19 25 34 27 88 49 28 83
14 | 12 19 49 8 2 10 21 8 51 20 79 58 42 44
15 | 19 15 12 26 12 23 15 17 32 10 44 88 27
16 | 14 24 32 38 36 26 22 22 17 66 60 163 68 16
17 | 23 29 11 17 17 41 14 13 25 15 34 137 67 36
18 | 23 56 21 49 25 25 39 14 29 33 56 145 58 28
19 | 34 37 34 19 31 21 35 9 29 27 30 106 25 43 26
20 | 19 28 27 25 28 22 67 23 25 24 92 148 37 34
21 | 46 40 38 16 32 40 36 43 31 43 62 131 37 61 42
22 | 42 36 37 37 35 57 36 36 38 65 62 97 51 57 37
23 | 70 29 32 55 42 23 40 45 29 57 73 92 67 52 29
---+------------------------------------------------------------
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
-----------------------------------------------------------
| Aug 1997 | 10x % reflec. time | horiz: day | vert: time |
--------------------------------------------------------------------
| 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
---+----------------------------------------------------------------
0 | 32 57 39 48 46 42 60 68 32 49 29 23 50 56 41 46
1 | 60 78 58 65 60 60 49 65 37 52 41 30 69 75 45 61
2 | 72 111 51 74 63 62 73 70 45 72 52 41 85 90 69 54
3 | 75 97 52 115 73 87 97 93 62 60 75 53 97 89 73 94
4 | 121 44 41 94 80 63 71 61 63 63 137 86 112 121 101 153
5 | 70 63 37 83 87 57 38 84 61 57 85 33 80 95 83 130
6 | 37 75 25 39 42 10 13 77 46 43 106 50 28 63 103 66
7 | 29 47 12 17 23 7 29 53 14 47 152 33 64 59 42
8 | 24 47 11 12 15 14 58 28 20 89 41 47 53 47
9 | 33 68 20 30 25 25 27 78 23 22 29 25 44 62 19
10 | 67 54 26 25 13 33 28 41 79 23 18 33 41 70 26
11 | 45 65 26 39 32 36 25 34 42 17 24 39 14 50 60
12 | 31 39 48 35 25 19 27 44 24 10 10 7 13 34 33
13 | 35 33 49 15 18 14 21 18 34 4 8 12 13 15 47 34
14 | 18 23 14 17 16 9 15 18 54 10 3 10 10 16 27 21
15 | 19 20 33 10 35 17 20 12 21 9 5 6 39 28 36 19
16 | 15 11 14 18 20 28 14 11 15 16 9 17 13 19 17
17 | 24 7 26 19 6 22 16 10 13 13 10 16 8 12 11
18 | 18 18 11 21 20 20 17 28 9 11 13 35 21 14 27
19 | 35 27 20 20 17 30 45 25 16 18 33 20 23 21 26 28
20 | 22 16 31 20 23 23 19 23 25 39 51 31 38 28 31 46
21 | 31 23 27 30 22 29 27 29 30 21 23 28 47 31 35 34
22 | 43 28 34 35 31 35 28 38 31 17 23 25 56 34 28 39
23 | 23 34 28 28 27 34 37 27 34 20 32 33 45 29 37 43
---+----------------------------------------------------------------
| 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Notes:
. ? probably affected by sporadic-E.
. not so strong Perseid activity as last year (but interesting daytime
observations had to be eliminated due to interference).
. alpha Aurigids at the end of the month.
. local time = UT + 2 hours.
Pierre De Groote / comments by C. Steyaert
---------------------------------------------------------------------------
Observer: Werfried Kuneth
Location: Ferndorf, Austria (13 37' E, 46 45' N)
Antenna: 3 element Yagi, direction south, elevation 65 deg
Receiver: AR-8000 at 53.7600 MHz, SSB mode.
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 on the same
frequency (+/- 10 Hz) and are processed within the same 40 Hz
receiver channel. Several high mountains in transmitter direction
prevent direct and tropospheric reception.
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.
Meteor counts of reflections longer than 6.5 seconds: assumed
to be overdense.
| Aug 1997
UT| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
---+------------------------------------------------------------
0| 49. 15 27 13 27 26 24 16 11 34 36 53 30 23
1| 47 21 26 29 16 25 13 23 26 31 36 40 34 26
2| 46 22 23 16 19 34 20 19 29 35 51 59 32 28
3| 47 22 24 14 27 25 34 35 31 29 48 53 41 30
4| 31 17 18 8 16 22 31 27 35 23 46 42 36 39.
5| 15 13 16 8 13 38. 22 26 27 24 24 51 35 46
6| 16 18. 11 5 7 17 13 16 6 30 27 58 30 43
7| 22 9. 5. 3 11 22 22 8 14 30 21 52 25 35
8| 6 10 9 6 11 27 13 6 27 21 55 28 22
9| 7 4 9 12 13 8 31. 13 66 30 25
10| 10 6 2 13 15 18 13. 19 38 25. 18
11| 4 1 7 6 13 4 21. 11 26 16. 14
12| 1 3 6 4 4 7 6 7 3. 6 29 12
13| 6. 1 9. 4 1 2. 1 1 5. 10
14| 4 1 0 1 9. 17 7 14 2.
15| 0 1 3. 3 0 5
16| 7.
17| 1 5. 2.
18| 0 10 19 5
19| 6 1 6. 5 1 5. 8 12 3
20| 1 5 5 0 9 3. 2 4. 14. 12 11 18
21| 8 6 3 3 6 9 8 8 10. 14 22
22| 9 13 6 7 14 15 4 11 8 27 7. 11 9
23| 4 21 10 21 20 16 7 17 24 21 36. 15 22
---+------------------------------------------------------------
UT| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
| Aug 1997
| Aug 1997
UT| 22 23 24 25 26 27 28 29 30 31
---+----------------------------------------
0| 12 6 4 4 0 7 12 15 2
1| 14 9 0 6 12 9 4
2| 16 6 10 6 14 6 5
3| 18 12 4 9 7 8 15 7
4| 19 3 11 7 5 10 9 6
5| 17 11. 8 6 12 9 6 15 11
6| 13 7 7 5 11 4 10 18 7
7| 10 19 7 5 8 4 11 20
8| 7 7 2 10 14. 3 13
9| 9 5 5 10. 2 3 8
10| 2 4 2 6 8 6
11| 13 3 5. 0 6. 4 6
12| 8 5. 4 0 7. 4 5
13| 3 2 5 1 5. 9 3 5
14| 3 0. 3. 0. 1 4.
15|
16| 3 0.
17| 2. 2. 2. 5.
18| 3. 0 0
19| 6 2.
20| 0. 9. 7 4. 0. 3. 0 2. 7
21| 6 3 4 0. 3 3 8 4
22| 6 9 3. 2 0. 7 9 7 4
23| 16. 5 13 2 4 10 12 7 4
---+----------------------------------------
UT| 22 23 24 25 26 27 28 29 30 31
| Aug 1997
The Perseids maximum on Aug 12-13 is not very explicit in the above counts.
I found the maximum to be clearer in the fireball counts, which I have for
2 different channels:
**Comparison of the radio fireballs counts for two different directions**
Channel "A": two transmitters from Italy, direction south, as described above
compared with Channel "C": one transmitter from Germany, northwest, distance
about 700 km, recorded at 62.2500 Mhz. Same recording technique as avove.
Even these long reflections (fireballs) depend on the specific transmitter-
receiver geometry, as the counts for the 2 channels are de-phased.
Only counts of reflection duration longer than 50 seconds are shown here,
assumed to be fireballs.
| Channel "A" Channel "C"
| Aug 1997 Aug 1997
UT| 3 4 5 6 7 8 9 10 11 12 13 14 15 11 12 13 14
---+---------------------------------------------------- ---------------
0| 1 0 1 2 2 2 0 2 1 1 0 0 0 0
1| 0 0 0 0 1 0 0 1 2 3 0 0 0 2 0
2| 0 0 1 0 1 0 1 1 6 5 1 1 1 1 0
3| 0 0 0 2 4 2 2 2 4 6 2 3 0 1 1
4| 1 1 0 0 0 1 0 0 4 6 5 5. 1 0 0
5| 0 0 2 2. 1 1 2 0 1 4 7 3 1 4 0
6| 2 0 0 2 0 1 0 2 2 4 3 2 0 3 2
7| 0. 0 0 0 4 0 1 4 3 4 2 3 1 3 1
8| 1 1 0 0 2 2 1 0 0 15 2 0 2 1 1
9| 0 1 1 0 2 2. 1 12 1 0 3 1 1
10| 0 0 0 0 1 0. 1 7 2. 1 5 0 1
11| 0 0 0 3 1 6. 0 0 0. 1 10 0 0
12| 2 1 0 0 1 0 0. 0 3 0 13 0
13| 2. 1 0 0. 0 0 0. 0 3 0.
14| 0 0 0 2. 0 0 0 0. 3 0
15| 0 0. 0 0 3 3
16| 2.
17| 0 2. 0. 0
18| 0 1 3 0 3 0
19| 0 0 0. 0 0 0. 1 0 0 0 0
20| 0 0 0 1 0. 0 0. 0. 1 0 0 0. 0. 0
21| 0 0 0 0 0 0 0 0. 0 0 0 1 0
22| 0 0 1 0 0 0 0 1 0. 0 0 0 0 0
23| 0 1 3 0 0 0 0 0 6. 0 0 0 0 0
---+---------------------------------------------------- ---------------
UT| 3 4 5 6 7 8 9 10 11 12 13 14 15 11 12 13 14
| Aug 1997 Aug 1997
Notes:
. blank value means either few or no data available, interference,
sporadic-E, E-layer or FAI propagation, or offline during
thunderstorms and holiday.
. local time conversion: 2 hours ahead of UT (04h00 UTC is 06h00 local)
Werfried Kuneth
---------------------------------------------------------------------------
Observer: Sadao Okamoto
Location: Damine, Japan (137.53 E, 35.07 N)
Transmitter: JA9BOH/b beacon for RMO (50 W CW 53.7500 MHz)
by JA9BOH Kimio Maegawa
Antenna: 2 element Cross Yagi 4 dBi aiming to Zenith.
Location: Sabae city (136.2 E, 35.9 N)
Receiver: IC575
Antenna: 2 element Yagi, pointed to the zenith
Notes: @xx numbers are converted hourly rate with less than hour data.
nxx numbers are uncertain data due to high noise level.
"--" means lost counts because of high noise level or machine failure.
"e" means lost counts because of Es opening.
Time is JST = 9 + UTC.
All echoes
1997
Aug|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
Aug|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|119 88 79 65 58 45 43 41 39 31 11 23 15 21 23 9 15 -- -- 14 19 26 49@56
02 |72 76 66 63 75 64 64 51 28 33 19 23 21 -- 22 24 12 9 21 25 26 40 50@66
03 |80 81 80 83 75 56 59 46 41 12 19 32 12 -- --@14 9 15 17 7 20 36 42@67
04 |65 63 50 70 66 78 58 55 34 29 30 21 21 -- 22 14 16 13 19 17 31 21 60@66
05 |65 58 63 73 68 62 43 39 41 24 21 28 21 25 17 19 25 22 12 11 21 39 49@45
06 |63 57 66 46 53 58 50 40 49 e e 20 19 23 26 16 18 20 16 9 31 37 51@60
07 |49 50 48 40 59 59 48 43 36 37 17 22 16 19 18 17 20 14 24 13 37 39 45@46
08 |65 58 78 61 59 59 52 43 40 29 23 26 18 24 17 24 25 13 15 15 29 35 49@54
09 |56 50 59 53 39 42 48 39 36 30 29 22 17 18 21 17 16 -- 18 15 32 38 38@45
10 |55 45 55 55 62 66 53 49 49 27 26@30n27 17 18 17 19 14 14 13 18 29 40@48
11 |56 46 57 63 70 60 43 47 30n21 -- -- 23 42 17 31 31 20 12 18 29 43 49@60
12 |62 58 70 88 84 84 70 59 62 44 31 21 22 37 e e e e e 18 33 37 52@75
13 |64 73 68 89 94 89 87 72 61 51 38 29 18 32 25 29 23 27 16 15 28 36 54@60
14 |63 53 68 92 86 67 80 53 62 43 40 30 31@34 25 21 28 17 17 21 33 39 53 --
15 |52 52 72 83 77 63 65 61 51 51 40 36 33 45 21 17 29 13 18 17 15 48 50@48
16 |53 40 60 59 72 63 59 55 46 40 31 19 28 36 22 e e e e 14 26 40 41@45
17 |54 66 61 61 64 90 71 50 38 e e e e@35 27 18 23 20 19 15 19 32 40@32
18 |45 40 51 62 50 65 56 63 46 22 27 29 27 27 36 34 18 14 17 25 23 37 39@47
19 |52 48 61 66 51 61 66 65 35 -- -- -- -- 25 29 19 16 15 12 17 42 29 48@44
20 |48 42 51 68 55 78 74 45 29 36 32 29 29 26 35 13 23 19 13 22 34 43 32@53
21 |46 53 56 65 57 62 53 50 40 30 37 25 30 31 22 19 18@16@12 16 22 36 43@30
22 |37 56 53 59 60 45 64 47 54 24 26 35 en16n16 23 19 19 12 16 26 34 41@46
23 |43 36 57 54 53 41 62 61 36 47 21 30 21 30 21 18 19 16 12 24 22 31 40@67
24 |56 47 36 56 52 64 47 44 35 31 25 22 20 23 e 12 e e e 18 25 34 44@53
25 |45 66 54 60 46 56 52 49 33 36n19n14n16n13n14 13n13 18 17n23n20n37n35@47
26 |51 50 38 60 46 51n49 54 39n30 19n31 16 29 30n11 n8 -- e 18 20 34 32@42
27 |58 39 49 38 45 56 55 51 38 21 21 15 12 18 14n14n15 18 22 17n21 35 30@31
28 |55 40 48 65 50 55 54 46 33 34 26n15n18n12 n9 n9n16n11 11 16 22 24 34@32
29 |47 53 54 55 62 50 58 54 33 26 27 18 n6 n8n12 n7n19 18n16 14 21 39 49@55
30 |46 51 40 53 55 58 52 41n40n31n12n11n10n16 n7 n7 11 12 8 16 26 36 32@48
31 |59 59 55 60 59 51 61 37 42 51 28 31 25n25 20n22 17 18 22 16 20 35 48@45
---+-----------------------------------------------------------------------
Aug|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 Aug|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
Aug|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
Aug|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 |12 10 18 8 6 6 2 8 6 3 2 2 1 2 8 5
02 | 8 6 6 3 6 10 6 4 2 3 3 1 1 1 11
03 | 8 8 12 16 14 7 10 7 5 1 1 1 2 1 6
04 | 2 1 5 9 11 9 4 5 1 6 2 3 2 3 2 2 3
05 | 4 6 6 10 7 6 3 2 1 2 3 1 3 1 1 3
06 | 5 7 10 2 10 7 4 3 2 2 2 1 2 1 1 2 1 1 1
07 | 3 6 11 6 6 9 6 3 2 2 2 1 2 1
08 | 1 7 11 9 10 5 4 2 4 1 5 2 1 1 1 1 1 1
09 | 6 5 10 12 5 5 8 3 5 3 2 1 2 1 2 2
10 | 3 2 4 9 8 5 5 3 12 4 1 2 1
11 | 3 8 10 8 9 11 11 8 5 6 2 1 1 1 4 2 2 7
12 | 5 12 27 22 29 29 16 19 18 12 4 1 1 5 1 3 9
13 |14 21 16 24 39 33 31 17 8 10 5 5 1 2 1 1 1 2 1 5
14 | 9 14 15 16 28 11 18 12 7 6 4 3 4 3 1 1 1 4 2
15 | 5 7 10 13 20 16 19 14 8 3 8 3 2 1 1 1 1 2
16 | 3 6 13 12 10 8 8 4 2 2 1 1 4 1 2 1
17 | 4 4 5 3 8 7 5 9 3 1 2 1 2 1
18 | 2 3 5 6 1 9 9 3 1 2 1 1 3 1 1 1 2
19 | 2 8 2 7 5 4 6 8 3 1 2 1 1 1
20 | 3 2 8 3 4 6 9 5 4 4 1 1 1 1 1 1
21 | 2 5 1 6 7 4 4 4 3 4 6 2 1 1 1 1
22 | 8 4 4 3 6 2 2 3 1 3 1 1 1 1 1 1
23 | 2 5 5 4 1 4 3 3 1 2 1 1 1 2
24 | 2 1 3 2 2 4 3 2 2 1 2 2 1
25 | 3 4 3 2 4 3 7 1 1 2 1 1 3
26 | 3 3 1 4 4 5 3 4 1 1 1 1
27 | 1 2 3 2 4 6 3 1 1 1 1 1 2 1 1 1 1 1
28 | 5 5 5 2 3 1 1 1 1 1 2
29 | 2 1 3 9 2 5 1 1 1 2 1
30 | 2 4 2 1 3 4 6 8 5 2 1
31 | 2 4 1 3 6 6 5 3 1 1 1 1 1 1 1 1
---+-----------------------------------------------------------------------
Aug|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 Aug|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
Sadao Okamoto / via Kimio Maegawa
---------------------------------------------------------------------------
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!)
Meteor counts in one hour intervals starting at:
Perseids 1997
| August 1997
UT | 11 12 13 14
----+----------------------------------
0 | 492 808 788 487
1 | 602 830 771 506
2 | 638 851 910 647
3 | 701 1043 994 540
4 | 803 836 935 535
5 | 660 531 907 516
6 | 662 709 819 698
7 | 545 1423* 820 557
8 | 533 1395* 828 303
9 | 411 1246* 853 386
10 | 372 911 500 412
11 | 183 745 511 317
12 | 311 567 312 277
13 | 229 573 257 202
14 | 227 326 222 179
15 | 265 367 201 203
16 | 235 369 239 232
17 | 126 339 249 291
18 | 158 365 207 303
19 | 247 315 299 172
20 | 396 574 270 397
21 | 510 510 401 236
22 | 439 492 327 422
23 | 456 730 545 370
----+----------------------------------
UT | 11 12 13 14
| August 1997
* observed Perseids maximum on Aug 12, 7-9h UT (in agreement with last
year's high activity on Aug 12, 0-2h UT , see RMOB9608)
Ilkka Yrjola / via M. De Meyere
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
Eisse Pieter Bus
Groningen, Netherlands
E-mail: epbus@worldaccessdot nl
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
67-9 Shimo Asojima Ohno Fukui 912 JAPAN
E-mail: kmaegawa@ip.fukui-nct.ac.jp
Alastair McBeath
IMO: International Meteor Organization
12A Prior's Walk, Morpeth, Northumberland, NE61 2RF, England, U.K.
E-mail: via Chris Steyaert
Sadao Okamoto
E-mail: okamoto@jim.sugiyama-u.ac.jp
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
homepage: http://WWW.SCI.FI/~OH5IY/
Call: OH5IY, packet radio: OH5IY@OH5RBG.#KVL.FIN.EU
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Christian Steyaert (RMOB9708) 8 September 1997
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