
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
--
