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(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
--