Radio Meteor Observation Bulletin No. 40 December 1996 1. FORWARD SCATTER METEOR OBSERVATIONS Observing method: listening Observer: E.P.Bus Location: near Salamanca, Spain (5 26' W, 41 12' N) Frequency: 87.9 MHz Transmitter Location: Lousa, Portugal, 50 kW, distance 268 km Antenna: Yagi, 3 elements, Azimuth 242 o (=WSW), elevation 36 o Receiver: Bearcat UBC 177XLT Scanning Radio, sensitivity: 0.5 microvolt Observing method: Listening Leonids 1996 Long duration reflections >1 sec during one hour intervals starting at 4h UT: 1996 UT Nov 17 4h 5h 6h 7h 8h # Refl 23 13 16 35 23 The most favourable antenna geometry for detecting Leonids is around 4h 30m UT. Unfavourable antenna geometry between 6h45m and 9h15m UT. After correction for Observability Function (after Hines) the Leonids showed the strongest activity since 1993. A small maximum was monitored around 4h45m UT (Solar Longitude 235.16 degrees) and a high maximum around 7h25m UT (Solar Longitude 235.29 degrees), shortly after that the Earth passed the node of the orbit of comet 55P/Tempel-Tuttle (235.255 degrees). Previous maxima were monitored at Solar Longitudes 235.82 degrees in 1994 and 235.32 degrees in 1995. (All longitudes for Epoch 2000). Peter Bus / via Ton Schoenmaker --------------------------------------------------------------------------- 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 66.50 Sofia Bulgaria 10 24hrs 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 o (= East), elevation 27 o 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]. November 1996 Leonids Raw counts of reflections with a duration of at least 0.027 s during one hour interval starting at UT: Nov | UT 1996 | 21h 22 23 00 01 02 03 04 05 06 07 08 09 10 ------+---------------------------------------------------------------------- 1- 2 | 31 29 41 47 53 35 63 42 46 89 87 2- 3 | 12 18 15 17 19 28 28 29 30 25 31 3- 4 | 18 22 23 30 38 48 51 44 36 54 26 4- 5 | 7 19 14 34 39 40 41 23 37 34 36 5- 6 | 15 13 19 28 30 38 32 25 27 41 48 6- 7 | 7- 8 | 8 19 18 26 23 29 25 20 43 48 23 8- 9 | 6 13 23 27 33 21 29 25 29 44 38 9-10 | 10-11 | 9 12 14 17 15 18 18 30 24 27 26 11-12 | 12-13 | 10 10 9 11 5 12 8 13 19 29 36 13-14 | 8 15 20 29 33 59 35 48 54 50 41 14-15 | 7 11 29 38 38 33 65 41 48 79 49 15-16 | 9 14 15 16 25 18 19 35 57 147 172 108 161 46 16-17 | 25 23 48 106* 233* 199* 316* 393* 333* 313* 394* 364* 248* 143 17-18 | 15 22 29 23 42 43 47 69 60 66 61 45 44 45 18-19 | 9 18 18 35 24 66 26 42 44 59 68 19-20 | 25 26 16 31 32 39 36 43 53 58 48 20-21 | 11 16 17 26 30 27 29 54 38 34 37 21-22 | 19 42 24 35 31 37 43 36 25 25 21 22-23 | 14 25 35 33 56 55 45 30 49 54 57 23-24 | 12 17 14 31 42 49 45 33 32 25 45 24-25 | 11 18 35 40 38 38 40 40 35 45 36 25-26 | 17 24 39 34 24 39 57 42 49 62 39 26-27 | 18 27 20 28 42 26 37 27 26 43 23 27-28 | 20 6 27 31 37 46 30 28 29 37 17 28-29 | 17 29 52 54 57 64 81 46 40 38 49 29-30 | 14 32 43 51 54 33 39 46 35 36 46 30-01 | 15 16 37 22 39 37 32 36 39 52 83 ------+---------------------------------------------------------------------- 1996 | 21h 22 23 00 01 02 03 04 05 06 07 08 09 10 Nov | UT Notes: . local time = UT + 1 hour * intense Leonid activity during the morning of Nov 17. The Leonid radiant rises at 22h30m, and sets at 14h UT. Best forward scatter conditions for this setup between 7h and 8h UT. Peak activity on Nov 17, 4h UT. . Radio-amateur comments: Johan, PE1LAU, Netherlands: "Leonids were very nice this time" (Nov 17, 7h-11h UT). I heard only few pings (=short reflections), it were every time bursts from 10 to 80 s at least! At one moment I thought it was like Es signal". Lasse, KP02, Finland: "what fun I had on Sunday morning (=Nov 17)... Great signals between 3h43 UT and 4h05 UT". Steffen, DD0VF, Dresden: "long burst on Nov 17, 3h 06 UT, 123 seconds... In the late morning of Nov 17th the longest burst was about 2 minutes with 4 different stations". Maurice De Meyere --------------------------------------------------------------------------- Observer: Werfried Kuneth Location: near Villach, Austria (13 37' E, 46 45 ' N) Antenna: 3 element Yagi Receiver: AR-8000 at 48.25000 MHz, SSB mode Narrow passband filter, no preamplifier. Transmitter: 250 kW TV video carrier in Madrid (Spain), distance 1550 km, southwest. 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. More details see This month I will report reflections duration (instead of reflection time percentage). Raw counts (minimum reflection duration of 0.5 seconds) Nov | UT 1996 | 0h 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 -----+---------------------------------------------------------------- 11 | 78 106 119 69 198 136 142 126 141 159 138 132 115 99 64 12 | 82 87 103 100 144 162 175 139 128 135 124 131 103 101 79 71 13 | 102 94 124 103 75 170 175 130 140 157 131 128 55 33 14 | 67 69 73 74 78 189 142 125 154 167 131 123 113 106 40 15 | 113 16 | 191 160 46 39 93 29 17 | 190 239 271 226 265 241 305 207 197 254 212 172 152 101 72 18 | 120 98 130 119 157 247 269 188 186 194 169 87 90 89 70 19 | 55 148 162 105 144 103 63 90 52 58 66 43 20 | 77 77 92 96 103 116 88 21 | 70 81 84 101 119 198 204 173 169 186 155 125 95 115 77 58 22 | 144 100 150 107 137 215 204 171 168 162 159 124 131 128 69 -----+---------------------------------------------------------------- 1996 | 0h 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 Nov | UT Raw counts (minumum reflection duration of 3 seconds) Nov | UT 1996 | 0h 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | 21 22 23 -----+-------------------------------------------------------------- 1 | 7 5. 8 5 1 8 0. 6 5 3 10 5 10 6 5. 2. | 2. 1 4 2 | 3 9 2 4 7 15 11 9 9 6 6. 7. | 2. 2. 3 | 5 4. 0. 7 2 2 2. 2 1. 3. | 1 4 2 4 | 5. 4 6 3 1. 7 11 6 4 7 6 4 1 2 4 1. 2.| 6 1 5 5 | 3 4 6 3 7 9 20 6 4 13 7 2 5 2 3 2 | 3 6 3 6 | 2 6 3 8 9 3 9 3 5 0 1 | 5. 7 6 7 | 8 4 3 3 7 6 7 6 12 5 4 2 3 3 3 5 0.| 1 4 2 8 | 7 5 4 4 3 7 5 7 7 1. 0. 3. 3. 2. 9 2 1 | 2 2 4 9 |10 7 5 2 2 7 16 3 4 7 5 5 5 1 2 4 2 | 2 0 3 10 | 8 13 7 10 11 14 10 3. 4 8 1 | 6 2 11 | 9 9 12 2.10 10 5 5 6 5 3 11 8 2 2 4.| 5 4 6 12 | 5 6 3 5 3 7 12 7 5 9 5 3 2 3 2 3 2 | 7 13 |11 4 9 4 0. 6 9 4 2 11 4 12 4. 3. | 4 8 14 | 1 6 6 9. 4 14 5 7 9 4 7 7 5 9 1. | 5 7 6 15 | 5 | 16 | 17 8 3. 4. 1 2. | 4 4 8 17 |23 41 46 40 54 42 62 43 52 43 23 15 10 3 4 | 4 8 10 18 | 8 14 9 8 25 23 19 15 6 13 5 3 6 5 3 4 | 6 3 19 | 5. 6 8 3 9 3 6 10 3 3 3 4 0.| 1 4 3 20 | 7 5 7 4 5 4 2 | 0. 5 5 21 | 5 5 7 2 7 7 2 6 3 8 8 7 5 1 0 3 3.| 7 7 22 |12 10 4 4 7 6 11 5 10 5 9 5 7 5 2. | 23 | 4 6 21 11 8 3. 6 9 13 10 | 2. 9 24 | 8 7 6 9 4. 5 16 9 5 8. 1. | 6 4 7 25 | 4 6 4 7 3 9 9 4 13 15 9 5 5 5 4. 1. 3.| 5 8 26 | 4 9 6 2 8 4 9 7 15 7 6 9 3 6 5 6 | 4 6 6 27 | 4 8 8 9 10 6 7 4 7 6 5 7 2 5 4 1 2.| 4 6 0 28 | 3. 1. 2 5 6 11 5 10 6 11 8 6 8 10 3 4 4 | 4 6 6 29 | 5 5 7 4 9 10 8 4 3 11 12 1. 5 5 2 | 10 18 10 30 |11 15 10 7 4 13 15 5. 5 4 7 8 10 2. 5.| 0 5 7 -----+-------------------------------------------------------------- 1996 | 0h 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | 21 22 23 Nov | UT Raw counts (minumum reflection duration of 10 seconds) Nov | UT 1996 | 0h 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | 21 22 23 -----+-------------------------------------------------------------- 11 | 2 0 0 0. 3 2 1 1 2 1 0 0 2 0 0 0.| 1 0 0 12 | 0 1 0 0 0 1 1 2 1 4 2 1 0 0 0 0 0 | 0 13 | 2 1 2 1 0. 2 2 1 0 2 1 2 1. 0. | 1 3 14 | 0 1 1 2. 1 6 2 0 2 0 1 2 1 1 0. | 0 0 0 15 | 0 | 16 | 7 1 0. 1. 0 0. | 0 0 2 17 | 8 14 22 21 21 20 23 22 22 15 10 4 2 0 0 | 1 0 0 18 | 3 2 0 2 9 7 7 7 1 3 2 0 0 0 0 0 | 0 0 19 | 1. 1 2 0 3 2 1 1 0 0 1 0 0.| 0 0 0 20 | 1 0 2 0 0 1 0 | 0. 1 1 21 | 2 0 1 0 1 4 1 1 0 0 1 0 1 0 0 0 1.| 0 2 22 | 1 1 0 0 0 1 2 0 0 0 0 0 1 0 0. | ------+--------------------------------------------------------------- 1996 | 0h 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 | 21 22 23 Nov | UT The Leonids showed up very well on November 17, and best in the 10 seconds (the longest) counts. Notes: . a dot (.) after the number stands for a lower observation period: 20-40 min. . blank value means either few or no data available, interference, power failure or transmitter shutdown. . local time conversion: 1 hours ahead of UT (07h00 UT is 08h00 local) . lots of thunderstorms on Nov. 15 and 16. Werfried Kuneth --------------------------------------------------------------------------- Observer: Kimio Maegawa Transmitter: 50 W CW 53.7500 MHz Transmitter antenna: 2 element Cross Yagi 4dBi, zenith Transmitting Location: Sabae city (136 11' E, 35 56' N) Receiver: IC726 500 Hz BW SSB, sensitivity -150 dBm sensit Receiver antenna: 3el Yagi 7 dBi (70 deg, SE direction) height 10 m Receiving Location: Ohno city (136 53' E, 36 00' N) Data processing : Receiver output is fed into DX2-66 MHz PC and analyzed by AF9Y's FFTDSP42 software. Then stored every 4.22 min automaticaly with GIF format. Play back GIF files and count echoes manually by the doppler shift rejecting tropo signal or airplane echo. Hourly echo counts A: all echoes L1: long echoes (T > 2.5 s) L2: long echoes (T > 15 s) 13 Nov 14 Nov 15 Nov 16 Nov 17 Nov UT | A L1 L2 A L1 L2 A L1 L2 A L1 L2 A L1 L2 ----+------------------------------------------------------- 00h | 52 0 0 54 3 0 89 5 2 77 1 2 80 8 12 01 | 66 1 0 46 1 0 78 2 1 86 3 0 73 2 6 02 | 46 3 0 30 2 0 53 3 0 67 3 1 69 5 3 03 | 35 3 0 22 1 0 50 3 0 55 2 0 49 1 1 04 | 58 4 0 38 0 0 38 0 0 47 2 0 36 0 0 05 | 40 1 0 31 2 0 32 1 1 46 2 0 44 0 0 06 | 19 0 0 30 0 0 32 2 0 33 1 0 26 2 0 07 | 19 0 0 30 2 0 32 2 0 22 1 0 26 1 1 08 | 26 1 0 45 6 0 18 0 0 16 2 0 17 0 0 09 | 31 1 0 28 3 0 26 2 0 @19 @0 @0 20 1 0 10 | 44 2 0 26 1 0 25 1 0 16 0 0 28 2 0 11 | 46 1 0 36 0 0 44 5 1 36 1 0 @31 @2 @0 12 | 68 1 0 51 1 0 52 2 0 51 2 0 - - - 13 | 76 4 1 57 5 1 69 8 0 41 2 0 111 7 1 14 | 69 2 0 62 2 0 82 9 0 77 1 0 76 3 0 15 | 78 2 1 80 3 0 63 4 0 82 2 0 99 5 0 16 | 93 4 0 70 2 1 106 10 1 94 11 1 121 7 3 17 | 95 5 0 78 12 1 89 7 1 104 6 6 122 11 5 18 | 117 5 0 110 11 0 110 13 1 130 10 6 147 7 5 19 | 110 9 0 96 5 1 110 2 2 118 18 6 125 14 7 20 | @118@11 0 @89 @9 0 @97 @5 0 @122@12 @9 105 6 7 21 | @109@14 1 106 7 1 111 12 1 132 13 13 22 | 91 6 0 99 12 3 100 8 0 82 9 11 23 | 85 2 1 97 6 0 93 2 1 95 10 12 ----+------------------------------------------------------- UT | A L1 L2 A L1 L2 A L1 L2 A L1 L2 A L1 L2 13 Nov 14 Nov 15 Nov 16 Nov 17 Nov Notes: . @ means less than 60min. . local time = JST = UT + 9 hours . additional information is available at Home Page http://www.tcp-ip.or.jp/~kaze/rmd.htm Anonymous FTP ftp:rasc5.kurasc.kyoto-u.ac.jp/pub/nakamura/hro Graph: 96leo_km.gif, Images: leo96boh.lzh Kimio Maegawa --------------------------------------------------------------------------- Observer: Ton Schoenmaker Location: Roden, Netherlands (6 26' E, 53 08' N) Frequency: 72.11 MHz Transmitter location: Wroclaw, Poland, 130 kW, distance 756 km Antenna: Horizontal Yagi, 5 elements, geographical azimuth 105 degrees (ESE), elevation 15 degrees Receiver: Homemade convertor 65-67 MHz to 28-30 MHz + Barlow-Wadley 0-30 MHz receiver; total sensitivity 0.3 uV for 20 dB S/N with a bandwidth of 3 kHz Observing method: Servogor strip-chart recorder, 120 or 600 mm/h Leonids (yes!) and Alpha-Monocerotids (no!) in November The numbers below give the hourly percentage of total meteor reflection time during a few nights around the Leonids and the Alpha-Monocerotids. Only reflections longer than 10 seconds were taken into account. A broad maximum of Leonids was observed between 01h and 09h UT on 17 November 1996, but also the observability function (Hines, Steyaert) was most favourable during that period. During the above-horizon-period of the radiant of the Alpha-Monocerotids no activity was measured on 20/21 November. | November 1996 UT | 10-11 15-16 16-17 17-18 20-21 ----+----------------------------------------- 22h | 0.3 1.7 7.5 23 | 0.0 14.0 3.9 1.0 00 | 0.6 0.0 26.2 12.1 1.5 01 | 1.0 1.1 40.0 4.2 0.6 02 | 1.8 1.0 35.0 6.9 1.7 03 | 0.8 2.2 58.5 4.2 2.9 04 | 0.4 6.8 56.0 6.4 4.0 05 | 2.8 4.9 60.3 6.7 2.8 06 | 1.4 16.5 * 6.5 1.1 07 | 2.2 * * 7.2 1.4 08 | 21.8 45.8 2.9 3.3 09 | 9.6 33.9 2.5 1.1 10 | 16.3 4.7 11 | 14.6 ----+----------------------------------------- UT | 10/11 15/16 16/17 17/18 20/21 | November 1996 * problems with pen of recorder Ton Schoenmaker --------------------------------------------------------------------------- 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 1996 | 11 12 13 14 15 16 17 18 19 20 21 22 | *(1) **(2) -----+-------------------------------------------------+----------- 1 | 17 19 25 21 17 13 25 39 23 29 29 27 | 18.7 28.7 2 | 10 24 22 19 17 10 22 18 34 25 22 | 18.4 21.8 3 | 18 15 23 15 15 17 18 21 21 23 20 27 | 17.2 21.7 4 | 17 15 22 13 22 15 18 19 24 21 26 22 | 17.3 21.7 5 | 23 26 26 26 22 15 20 18 24 21 25 26 | 23.0 22.3 6 | 13 22 21 22 14 25 28 23 20 22 21 23 | 19.5 22.8 7 | 8 15 14 | 12.3 8 | 24 15 24 23 24 29 28 23 26 | 21.0 25.5 9 | 8 24 19 18 12 24 23 30 17 18 29 28 | 17.5 24.2 10 | 12 21 14 16 19 14 22 | 16.0 22.0 11 | 28 23 15 20 13 21 19 18 27 31 23 | 19.8 23.2 12 | 17 22 13 20 12 15 24 15 19 20 21 29 | 16.5 21.3 13 | 17 15 19 20 15 23 21 18 33 25 22 20 | 18.2 23.2 14 | 17 16 16 16 14 23 21 21 25 17 29 24 | 17.0 22.8 15 | 14 17 25 16 17 15 16 22 18 27 29 27 | 17.3 23.2 16 | 13 25 21 14 20 30 26 24 30 23 36 44 | 20.5 30.5 17 | 22 27 25 17 16 24 35 34 37 27 40 35 | 21.8 34.7 18 | 19 14 17 18 22 19 29 26 34 18 31 29 | 18.2 27.8 19 | 11 23 8 17 14 16 20 18 20 23 34 18 | 14.8 22.2 20 | 18 22 20 13 17 13 24 21 28 32 14 18 | 17.2 22.8 21 | 17 18 18 10 17 22 13 21 21 24 20 23 | 17.0 20.3 22 | 9 18 21 15 16 19 19 31 25 21 21 26 | 16.3 23.8 23 | 13 15 16 13 14 19 21 18 18 19 18 20 | 15.0 19.0 24 | 13 11 19 13 21 22 15 27 20 21 19 | 16.5 17.0 25 | 14 11 9 9 11 16 21 18 22 | 11.7 20.3 26 | 10 13 16 19 18 21 27 21 22 33 22 15 | 16.2 23.3 27 | 16 18 21 17 24 14 20 19 29 19 24 19 | 18.3 21.7 28 | 15 20 17 17 22 21 14 31 29 24 26 31 | 18.7 25.8 29 | 14 13 26 16 16 21 20 28 23 21 27 26 | 17.7 24.2 30 | 8 18 13 12 16 18 14 26 28 24 21 11 | 14.2 20.7 -----+-------------------------------------------------+----------- 1996 | 11 12 13 14 15 16 17 18 19 20 21 22 | *(1) **(2) Nov | UT * (1) average hourly rate between 11-17 UT **(2) average hourly rate between 17-23 UT - local time = JST = UT + 9 hours Chikara Shimoda --------------------------------------------------------------------------- Observer: Kazuhiro Suzuki HRO (Radio Meteor Observation using HAM) Location: Toyokawa Meteor Observatory (137.32 deg E, 34.81 deg N) Shiinoki, Toyokawa-city, Aichi, 442, JAPAN Transmitter: JA9BOH 53.7500 MHz, CW 50 W Antenna: Dipole (height 7 m, to zenith) Receiver: IC-575 (ICOM) LSB BW 2.5 kHz Transmitter location: Sabae (in Fukui pref.), about 150 km north north-west from receiving station. Method of echo sampling: After image procedure was done by PC with FFT software, echoes(>10 dB(S/N)) were counted. Total echo rates Nov | UT 1996 | 15 16 17 18 19 20 21 22 23 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 ------+------------------------------------------------------------------------ 31- 1 | 44 73 67 45 50 48 44 54 47 52 32 26 34 25 22 24 20 18 13@17 21 26 28 37 1- 2 | 34 46 46 38 32 33 51 44 48 34 33 36 30 20 18 16 16 15 16 19@21 26 30 33 2- 3 | 35 54 43 56 45 31 33 37 37 38 40 32 26 31 21 25 15 14 15 19 17 30 27 35 3- 4 | 40 46 43 44 34 48 30 32 33 42 37 29 26 22 18 20 16 15 16 22 25 39 34 49 4- 5 | 37 76 65 71 65 62 54 50 48 47 48 38 35 25 24 24 16 19 14@17 26 37 36 45 5- 6 | 59 68 66 54 54 63 51 50 66 54 54 36 37 26 24 28 19 14 21@29@27 35 31 26 6- 7 | 46 53 61 61 59 53 51 59 47 47 34 35 30 34 27 21 18 23 20 16@20 38 36 44 7- 8 | 45 57 58 64 47 51 56@60 49 55 37 44 35 33 30 19 25 21 19 21 24 41 33@34 8- 9 | 54 58 62 59 62 50 66 53 44 45 42 34 29 25@25 18 19 16 17 19 28 32 37 31 9-10 | 51 50 53 48 45 39 43 53 36 32 45 30 31 23@21@18 18 15 13 18 19 28 28 37 10-11 | 36 44 55 44 47 41 36 46 45 40 43 29 26 20 16 21 14 15 16@21@21 29 27 24 11-12 | 33 39 37 39 32 35 33 32 26 25 23 20 21 17 18 13 14 14 13@17@19 31 32 31 12-13 | 26 41 39 33 34 36 37 42 45 39 34 27 24 27 27 16 14 1 416@21@17 27 29 32 13-14 | 28 36 37 33 35 31 37 38 28 28 21 20 23 21 20 17 13 16 15@18 21 28 32 29 14-15 | 41 49 51 56 52 44 38 32 33 33 27 25 23 23 18 15 14 13 13@14 19 28 27 35 15-16 | 34 46 48 60 35 46 41 30 37 29 29 19 25 17 15 18 14 16 14 16@21 25 25 16-17 | 25 41 46 38 41 34 41 50 41 47 25 28 31 21 13 14 15 12 12@13@15 20 24 22 17-18 | 25 32 42 32 30 31 32 28 34 27 34 28 19 25 21 18 17 12 13@15@17 23 25 18 18-19 | 20 30 27 34 44 31 32 30 29 29 28 28 16 15 20 14 12 13 12@11@13 28 37 33 19-20 | 39 38 46 34 40 53 36 39 22 34 24 23 24 17 16 16 15 15 15@14@21 28 31 40 20-21 | 24 39 52 41 45 39 49 46 37 34 31 29 23 16 18 14 17 14 17 16@28 23 32 25 21-22 | 28 36 31 42 31 38 50 35 39 25 24 24 24 19 18 16 13 17 13 16@20 24 35 33 22-23 | 28 47 57 50 50 36 42 32 39 34 25 35 24 22 23 21 17 17 14@19@23 32 33 28 23-24 | 40 31 36 35 39 32 38 32 39 42 35 30 30 23 24 18 17 14 16@18@19 35 26 44 24-25 | 33 49 56 60 47 54 42 40 43 33 28 33 27 19 17 20 16 17 14@21@20 26 32 38 25-26 | 39 58 45 56 58 59 66 48 44 51 30 36 27 20 20 16 16 13 16@18@19 26 41 44 26-27 | 38 53 56 57 46 38 33 47 45 33 35 38 25 20 21 19 13 15 13@15 18 22 25 39 27-28 | 35 51 56 44 59 53 57 42 45 38 43 21 28 23 22 23 19 11 14@15@18 31 32 48 28-29 | 42 44 66 60 57 46 51 56 45 44 35 31 23 23 28 15 14 13 17 17@18 26 26 28 29-30 | 44 49 75 75 74 54 55 49 61 41 38 33 36 32 27 30 26 16 15@17 22 27 26 36 ------+------------------------------------------------------------------------ 1996 | 15 16 17 18 19 20 21 22 23 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 Nov | UT Hourly rate of long (> 20 s) echoes Nov | UT 1996 | 15 16 17 18 19 20 21 22 23 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 ------+------------------------------------------------------------------------ 6- 7 | 1 1 7- 8 | 1 1 1 8- 9 | 1 1 3 1 9-10 | 1 1 1 1 10-11 | 1 1 11-12 | 1 2 1 12-13 | 1 2 1 13-14 | 2 1 14-15 | 2 1 2 2 3 1 2 1 15-16 | 1 1 1 2 1 0 0 1 2 1 2 1 0 0 0 0 0 0 0 0 0 0 0 16-17 | 0 1 7 4 5 3 8 11 12 14 8 4 1 0 0 0 0 0 0 0 0 0 0 0 17-18 | 1 1 2 3 0 1 5 1 3 5 3 1 0 0 0 0 0 0 0 0 0 0 0 0 18-19 | 0 0 1 0 0 1 1 1 3 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 19-20 | 0 0 1 2 1 0 0 1 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 20-21 | 1 1 1 1 21-22 | 1 1 2 1 22-23 | 1 1 1 23-24 | 1 1 24-25 | 1 1 25-26 | 1 1 1 26-27 | 1 1 27-28 | 1 1 1 3 1 28-29 | 1 1 2 2 1 29-30 | 2 1 1 1 ------+------------------------------------------------------------------------ 1996 | 15 16 17 18 19 20 21 22 23 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 Nov | UT Dead time (in 0.1 minute) of observation due to persistant meteor echo. For example, 116 means 11.6 minutes. All dead times observed zero for 04h - 14h UT. Nov | UT 1996 | 15 16 17 18 19 20 21 22 23 00 01 02 03 ------+------------------------------------------- 16-17 | 01 11 40 26 34 23 80 116 124 112 77 44 21 17-18 | 07 07 13 22 0 07 51 03 19 30 25 03 0 ------+------------------------------------------- 1996 | 15 16 17 18 19 20 21 22 23 00 01 02 03 Nov | UT Notes: . local time = JST = UT + 9 hours. @ means converted hourly rate. Kazuhiro Suzuki --------------------------------------------------------------------------- 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 o (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 (new version!) Counts in one hour intervals starting at: | 1996 UT | 16 Nov 17 Nov 18 Nov 19 Nov ----+----------------------------------- 0 | 322 775* 347 282 1 | 359 1025* 376 306 2 | 321 1252* 496 311 3 | 342 1216* 387 302 4 | 348 1423* 415 282 5 | 503 1355* 362 323 6 | 383 1684* 283 331 7 | 325 1391* 381 361 8 | 455 1425* 279 245 9 | 411 677* 313 308 10 | 305 361 248 266 11 | 422 288 229 275 12 | 300 439 223 246 13 | 184 432 193 194 14 | 172 208 228 187 15 | 184 155 188 157 16 | 201 167 182 188 17 | 201 215 194 192 18 | 199 224 210 243 19 | 275 229 246 248 20 | 275 206 275 279 21 | 272 250 288 274 22 | 338 279 304 277 23 | 391* 329 279 295 ----+----------------------------------- UT | 16 Nov 17 Nov 18 Nov 19 Nov | 1996 * very strong Leonid activity during the morning of Nov 17. 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 E.P. Bus Eerste Spoorstraat 16, NL-9718 PB Groningen, Netherlands tel: +31 (0)50 3134211 E-mail: via tonsch@ksw.rug.nl Maurice De Meyere Hullekensstraat 24, B-9831 Deurle, Belgium tel: +32 (9) 282 35 26 Call: ON4NU, packet: ON4NU@ON4AWP E-mail: via Chris Steyaert University of Ghent, Astronomical Observatory Krijgslaan 281(S9), B-9000 Gent, Belgium E-mail contact: paul.vauterin@rug.ac.be Werfried Kuneth Villach, Austria Call: OE8FNK E-mail: 100021.514@compuserve.com Kimio Maegawa Fukui National College of Technology, Electro-Information Course E-mail: kmaegawa@ip.fukui-nct.ac.jp (weekdays), HAG00032@niftyserve.or.jp tel: 0778-62-1112-408 (PB) fax 0778-62-3414 Call: JA9BOH PM86fa Ton Schoenmaker Meester Homanstraat 8, NL-9301 HP Roden, Netherlands tel: +31 (0)50 5013382 Call: PA0EFA E-mail: tonsch@ksw.rug.nl Chikara Shimoda 178, Hario, Asahi-mura, Higashitikuma-gun Nagano, JAPAN FAX:+81-263-99-3532 E-mail: DZB91458@pcvan.or.jp Chris Steyaert, VVS Kruisven 66, B-2400 Mol, Belgium tel: +32 (14) 31 51 04 E-mail: steyaert@vvs.innet.be Compuserve: 72650,3513 Kazuhiro Suzuki 249-1, Shiinoki, Tameto-cho, Toyokawa, 442, JAPAN FAX:+81-5337-6-2852 E-mail: kaze@tcp-ip.or.jp Radio Meteor Data (RMD), JAPAN: http://www.tcp-ip.or.jp/~kaze/rmd.htm 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 tel: work: +358 (05)0204152797 fax +358 (05)0204152999 home: +358 (05)3743745 Call: OH51Y -- Christian Steyaert (RMOB9611) 7 December 1996 -- ------------------------------------------------------------------------ | Chris Steyaert Tel : +32 (14) 31 51 04 | | V.V.S. Astronomical Association | | Belgium E-mail : steyaert@vvs.innet.be | | Kruisven 66 Compuserve: 72650,3513 | | B 2400 Mol, Belgium 51° N, 5° E | ------------------------------------------------------------------------