Radio Meteor Observation Bulletin No. 15 November 1994 1. FORWARD SCATTER METEOR OBSERVATIONS Observer: M. De Meyere Location: Deurle, Belgium (3 37' E, 51 00' N) Frequency: 66.17 MHz Transmitter Locations: Katowice, PR3, Poland, 65.99 MHz, 14 kW, Distance 1100 km P. Neant, PR3, Romania, 66.17 MHz, 40 kW, Distance 1400 km Czestochowa, PR3, Poland, 66.23 MHz, 20 kW, Distance 1080 km Gdansk, PR3, Poland, 66.29 MHz, 40 kW, Distance 1100 km Antenna: crossed Yagi, 4 elements, Azimuth 270 o (=East), elevation 30 o Antenna amplifier: 25 dB max level 90 dBmuV Receiver: commercial, Progresson 447A, TESLA, Bratislava Sensitivity: 8 muV for S/N = 26 dB (300 Ohm) 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]. Raw counts of reflections with a duration of at least 0.027 s during one hour interval starting at UT: October 1994 Orionids Oct | 1994 | 20h 21 22 23 00 01 02 03 04 05 06 07 --------------------------------------------------------------------- 1- 2 | 28 40 52 31 38 29 11% 1% 30 91 91 72 2- 3 | 33 55 42 47 32 5% 1% 23 69 71 67 60 3- 4 | 69 103 116 85 63 13% 1% 63 126 143 131 138 4- 5 | 74 105 124 136 114 6% 6% 79 162 159 150 142 5- 6 | 101 101 150 115 94 9% 7% 124 186 183 173 154 6- 7 | 74 117 144 113 113 7% 6% 156 170 179 171 149 7- 8 | 77 102 128 118 103 26% 2% 56 179 153 157 165 8- 9 | 89 127 159 126 90 107 23% 8% 71 188 152 153 9-10 | 77 86 140 114 90 12% 12% 143 169 175 165 122 10-11 | 86 120 132 132 93 55% 12% 81 128 140 128 128 11-12 | 83 104 113 81 70 41% 3% 58 150 139 112 100 12-13 | 96 145 116 98 105 5% 30% 123 145 124 118 70 13-14 | 87 93 127 87 77 3% 6% 80 143 134 127 107 14-15 | - - - - - - - - - - - - 15-16 | 93 114 145 91 83 94 44% 5% 63 129 147 148 16-17 | 93 114 127 106 107 23% 1% 81 158 164 197 121 17-18 | 88 104 166 149 103 29% 9% 126 203 231 188 180 18-19 | 103 162 191 188 156 18% 16% 201 297 285 213 207 19-20 | 103 151 153 161 168 28% 9% 142 284 227 226 204 20-21 | 92 122 196 160 148 25% 18% 129 227 187 176 179 21-22 | - 140 176 143 133 29% 5% 183* 332* 394* 249* 199 22-23 | 108 150 213 170 183 201 84% 24% 162 283* 272* 229 23-24 | & & 160 143 146 23% 7% 156 237 169 204 141 24-25 | 107 153 150 124 135 29% 9% 90 175 153 170 151 25-26 | 97 148 174 166 132 22% 21% 195 158 167 188 150 26-27 | 95 158 166 137 121 18% 7% 168 155 172 174 118 27-28 | 104 132 167 150 128 13% 11% 112 176 170 172 139 28-29 | 95 146 166 144 112 39% 7% 65 162 169 193 154 29-30 | 101 132 174 124 112 128 30% 32% 128 160 150 131 30-31 | 111 149 163 134 126 18% 23% 123 158 186 178 146 31-01 | 136 150 168 161 110 124 91% 151 177 206 202 154 ------|------------------------------------------------------------------ 1994 | 20h 21 22 23 00 01 02 03 04 05 06 07 Oct | Notes: . change in hardware setup on Oct 3 (a dedicated PC-AT is now in place). . % : transmitter outage during the whole hour or a part of it. Low counts indicate that no other interference, which could be confused with meteors, is picked up. Few transmitters are broadcasting between 2h-4h local time (Sat-Sun 3h-5h local time) or sometimes longer. (When winter hour is in use: local time = UT + 1h). The switch to winter hour took place during the night of Sept 24-25. . & : manually eliminated for direct reception. * strong activity can be noticed on 22 Oct 3h - 6h UT and 23 Oct 5h - 6h UT. The Orionid radiant rises at 20h30m, and sets at 11h15m. Best forward scatter conditions for this setup around 5h - 7h UT. M. De Meyere / C. Steyaert 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 has gradually been expanded. Typically it contains: summaries of recent observations, 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 unsubscribe) 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 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 Chris Steyaert, VVS Kruisven 66, B 2400 Mol, Belgium tel: +32 (14) 31 51 04 fax: +32 (14) 22 13 73 E-mail: steyaert@vvs.innet.be Jeroen Van Wassenhove, VVS 's Gravenstraat 66, B 9810 Nazareth, Belgium tel: +32 (9)385 61 09 E-mail: 100101.734@compuserve.com Paul Vauterin, University of Ghent, Astronomical Observatory E-mail: paul@izar.rug.ac.be -- Christian Steyaert (RMOB9410) 7 November 1994 --