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(meteorobs) Radio Meteor Obs. Bull. Aug 1998 1/2
Radio Meteor Observation Bulletin No. 61 September 1998
** Fifth anniversary - with thanks to all observers **
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.
| Aug 1998
UT | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
----+------------------------------------------------------------
0 | 66 97 52 79 63 47 52 61 22 34 21 38 40 19
1 | 87 71 64 62 57 49 52 44 22 31 38 37 39 29
2 | 63 38 71 45 54 29 43 52 15 11 14 18 28 19
3 | 44 76 69 28 41 48 34 62 8 21 28 31 28 14
4 | 55 70 60 45 55 54 65 42 22 20 44 36 31 20
5 | 65 92 75 64 58 49 70 52 30 25 42 63 40 15
6 | 49 76 72 48 51 44 42 76 28 22 46 60 33 25
7 | 46 45 57 61 46 48 50 83 20 24 65 68 35 23
8 | 22 47 58 50 47 39 52 56 21 27 44 54 26 20
9 | 39 75 37 62 43 45 55 47 35 15 75? 45 37 24
10 | 32 61 62 43 40 36 37 53 26 15 1 38 55 34
11 | 23 36 44 38 39 34 35 67 13 22 47? 42 35 69
12 | 21 111& 32 50 30 24 56 73 19 18 42 34 30 93
13 | 20 348& 19 16 41 44 38 23 10 21 36 38 23 52
14 | 28 96 33 26 36 27 39 49 17 23 29 25 68 17
15 | 26 52 36 29 44 36 31 30 15 18 45 41 25 10
16 | 25 28 32 26 35 33 19 25 13 16 26 28 21 18
17 | 26 17 27 27 32 17 20 30 18 22 18 29 25 18
18 | 23 18 27 19 22 22 32 39 78 16 17 17 29 25
19 | 24 20 20 12 29 22 41 0 37 6 17 24 13 16
20 | 30 22 31 23 21 46 23 16 15 10 24 17 15 9
21 | 54 39 34 24 19 66 44 35 18 8 12 31 18 16
22 | 76 60 41 38 52 52 43 33 15 30 30 49 26 10
23 | 80 90 62 50 51 44 45 79 18 27 20 55 37 13
----+------------------------------------------------------------
UT | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
| Aug 1998
| Aug 1998
UT | 23 24 25 26 27 28 29 30
----+--------------------------------
0 | 14 8 13 11 13 18 21 12
1 | 11 5 13 4 9 9 15 11
2 | 12 9 12 11 10 7 17 19
3 | 16 18 15 5 5 9 9 12
4 | 12 12 8 10 10 9 14 13
5 | 12 27 20 8 18 10 9 14
6 | 10 17 8 10 11 30 11 13
7 | 13 14 9 9 20 6 12 13
8 | 21 8 8 7 12 13 16 14
9 | 4 9 10 11 7 12 15 9
10 | 5 6 9 12 10 10 12 12
11 | 3 6 3 1 7 7 11 7
12 | 5 4 8 3 11 4 4 14
13 | 6 3 2 5 6 3 8 31
14 | 3 3 6 5 8 3 8 32
15 | 4 4 10 8 6 9 3 8
16 | 3 5 9 5 6 8 7 6
17 | 4 6 10 11 3 12 3 6
18 | 4 8 5 5 3 6 5 6
19 | 9 5 7 9 4 3 6
20 | 29 11 5 4 5 8 9
21 | 41 11 12 10 8 9 2
22 | 14 12 13 17 12 5 8
23 | 19 11 15 10 10 20 17
----+--------------------------------
UT | 23 24 25 26 27 28 29 30
| Aug 1998
Notes:
. & invalid data stored
. power loss and UPS unload between Aug 15 - 22
. ? possibly affected by sporadic-E or FAI.
Es between 09h36 and 11h36 on Aug 12, during Perseid activity
. the secondary Perseid peak is visible on Aug 12, 15h
Enric Fraile Algeciras
---------------------------------------------------------------------------
Observer: Michael Boschat
Location: Halifax, Canada (63 36'W, 44 39'N, 58 meters above sea level)
Listening Frequency: 83.24 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
August 1998
Number of meteors heard in one hour interval
1998| UT
Aug | 10h 11 12 13 14 15 16 17 18 19 20 21 22
----+---------------------------------------------------
1 | 5 - - - - - - - - - - - -
2 | 10 - 2 1 - - - - - - - - -
3 | 3 1 3 - 3 - - - - - - - -
4 | - - - - 15 - - - - - - - -
5 | - - - - - - - - - - - - -
6 | 3 3 1 - - - - - - - - - -
7 | - - - - - - - - - - - - -
8 | - - - - - - - - - - - - -
9 | - - - - - - - - - - - - -
10 | - - - - - - - - - 2 9 2 -
11 | 19 15 22 23 14 - - - - - - 3 1
12 | - 15 8 22 23 13 4 - 3 5 - - -
13 | 1 2 1 2 - - - - - - - - -
14 | 5 1 2 5 2 - - - - - - - -
15 | 25 17 10 13 18 4 - - - - - 3 1
16 | 3 - - 3 12 3 - - - - - - -
17 | - - - 17 29 19 16 - - - - - -
18 | 5 2 2 7 14 9 - - - - - - -
19 | - - - - - - - - - - - - -
20 | 3 11 16 28 11 15 - - - - - - -
21 | - - - - 3 12 - - - - - - -
22 | - 2 1 4 3 - 6 - - - - - -
23 | - - 2 3 2 - - - - - - - -
24 | 8 19 I I 9 - - - - - - - -
25 | 3 1 2 2 2 - - - - - - - -
26 | - - - - - - - - - - - - -
27 | - - - - - - - - - - - - -
28 | - - - - - - - - - - - - -
29 | - - - - - - - - - - - - -
30 | - - - - - - - - - - - - -
31 | 3 3 9 - - - - - - - - - -
----+---------------------------------------------------
Aug | 10h 11 12 13 14 15 16 17 18 19 20 21 22
1998| UT
1998| UT
Aug | 01h 02 03 04 05 06 07 08 09
----+-----------------------------------
10 | - 15 5 11 18 - - - -
11 | - - - - - - - - -
12 | 12 - - 1 - - - - -
13 | - - - - - - - - -
14 | 2 - - - - - - - 3
15 | - 3 8 - - - - - -
16 | - - - - - - - - -
17 | - - - - - - - - -
18 | - - - - - - - - -
19 | - - - - - - - - -
20 | - - - - - - - - 11
----+-----------------------------------
Aug | 01h 02 03 04 05 06 07 08 09
1998| UT
Notes:
. no corrections for radiant position made to the counts.
. ( - ) means no observations made.
. Active showers: S. Iota Aquarids maximum on Aug 4
N. Delta Aquarids Aug 8
Perseids Aug 12
Kappa Cygnids Aug 18
N. Iota Aquarids Aug 20
Gamma Leonids Aug 28 - radio shower
. I= Interference
Mike Boschat
---------------------------------------------------------------------------
Observer : Eisse Pieter (Peter) Bus
Location : Groningen, Netherlands (6 degrees 33' E, 53 degrees 13' N)
Frequency : 72.11 MHz
Transmitter Location: Wroclaw, Poland, 130 kW, Distance 740 km
Antenna : Yagi, 3 elements, geographical azimuth 106 degrees (ESE),
elevation 13 degrees.
Receiver : Bearcat UBC 860 XLT 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 1998 July 5 and 1998 August 2.
Between brackets the statistical error of one-sigma (n-1).
Hour rates starting at UT:
12h 13h 14h 15h 16h 17h
--------------------------------------------
7(4) 7(3) 6(3) 6(4) 5(4) 5(2)
The "sporadic" activity between 16h and 18h UT is exactly the same as observed
in 1997.
Mean "sporadic" activity of all reflections between 1998 July 5 and
1998 August 2.
Between brackets the statistical error of one-sigma (n-1).
Hour rates starting at UT:
12h 13h 14h 15h 16h 17h
--------------------------------------------
80(14) 64(8) 64(10) 67(13) 74(10) 75(8)
The "sporadic" activity between 16h and 18h UT is almost the same as observed
in 1997 (73, 72).
Throughout 1998 the mean "sporadic" activity is almost the same as observed
in previous years. In my observations there is no sign that the sender at
Wroclaw (72.11 MHz) is shut down or reduced the power.
See remarks by Ton Schoenmaker and Wim Zanstra in RMOB9802 (No.54).
As there was some weak sporadic-E and other (ionospheric?) interference on
August 11 and 12, only long-duration reflections >1 sec are given.
Between brackets the total reflection-time in minutes.
Perseids 1998
Uncorrected hour rates starting at UT:
12h 13h 14h 15h 16h 17h
--------------------------------------------------------------
August 11 14(2.5) 16(1.2) 13(1.2) 12(1.5) 13(0.5) 13(1.3)
August 12 28(5.2) 28(7.5) 45(14.8)31(15.0)17(4.1) 13(1.5)
Counts corrected for dead-time, "sporadics" and observability function, show
for the Perseids a half-wide maximum at 14h50m UT = solar longitude 139.72
degrees (2000.0).
Half-wide maximum of long duration reflections >1 sec in previous years for
the Perseids are observed at solar longitudes 139.65 degrees in 1995,
139.67 in 1996 and 139.69 in 1997.
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
66.47 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].
July 1998
Raw counts of reflections with a duration of at least 0.027 s
during one hour interval starting at UT:
Jul | UT
1998 | 20h 21 22 23 00 01 02 03 04 05 06
------+------------------------------------------------------
1- 2 | 39 45 67 65 83 64 107 131 108 ? ?
2- 3 | 28? 40 50 58 52 65 72 61 82 ? ?
3- 4 | 28? 34 52 56 55 74 83 95 75 ? ?
4- 5 | 38 43 53 69 48 56 72 111 79 ? ?
5- 6 | 44 44 53 66 70 72 89 126? 109 69 60
6- 7 | 38 42 52 62 77 66 90 129 100 116 56
7- 8 | 37 56 50 51 55 79 93 104 82 57 56
8- 9 | 47 38 45 59 52 62 89 78 90 94 ?
9-10 | 29 58 52 80 60 57 82 98 53 75 78
10-11 | 26 41 47 43 51 61 71 85 89 102 62
11-12 | 31 43 54 67 83 58 93 96 75 99 52
12-13 | 22 51 60 66 66 67 88 88 81 77 55
13-14 | 20 53 38 55 59 72 79 84 74 84 65
14-15 | 31 46 55 40 54 51 81 93 ? 60 69
15-16 | 47 41 48 69 58 49 79 91 71 ? ?
16-17 | 31 64 72 62 47 68 91 109? ? 85 ?
17-18 | ? ? 54 48 57 62 &101 70 76 72 54
18-19 | 37 57 57 50 67 68 74 71 74 64 32
19-20 | 56 29 47 88 54 61 63 75 69 ? ?
20-21 | 50 50 33 45 60 49 73 58 84 62 ?
------+------------------------------------------------------
1998 | 20h 21 22 23 00 01 02 03 04 05 06
Jul | UT
Raw counts of reflections with a duration of at least 1.000 s
during one hour interval starting at UT:
Jul | UT
1998 | 20h 21 22 23 00 01 02 03 04 05 06
------+------------------------------------------------------
1- 2 | 2 9 12 6 12 4 14 23 24* ? ?
2- 3 | 7? 6 3 5 3 8 10 3 17* ? ?
3- 4 | 7? 5 11* 11 5 12 8 15 21* ? ?
4- 5 | 5 5 7 6 10* 7 9 13 9 ? ?
5- 6 | 7 9* 5 1 6 8 9 20? 14 10 12
6- 7 | 8* 6 4 5 11 6 8 8 13 17 13*
7- 8 | 5 7 3 8 7 5 15 15 13 7 2
8- 9 | 8 4 7 5 5 7 12 14 11 26* ?
9-10 | 4 11 6 7 7 7 10 15 7 10 18*
10-11 | 4 2 7 3 5 13* 6 10 14 15 11
11-12 | 4 1 4 3 12 5 13 13 4 18 7
12-13 | 1 7 9 4 4 17* 8 15 15 6 9
13-14 | 3 6 3 6 9 6 6 11 8 15 10
14-15 | 3 9 1 9* 9 2 12 13 ? 5 5
15-16 | 8 11* 2 5 5 6 7 7 11 ? ?
16-17 | 4 12 11 5 3 11 8 17 ? 18* ?
17-18 | ? ? 6 5 9 10 &41* 6 4 10 7
18-19 | 6 6 7 12* 12 13 10 5 5 5 4
19-20 | 7 2 3 22* 4 5 11 9 22* ? ?
20-21 | 7 5 3 2 4 7 5 7 11 10 ?
------+------------------------------------------------------
1998 | 20h 21 22 23 00 01 02 03 04 05 06
Jul | UT
August 1998
Raw counts of reflections with a duration of at least 0.027 s
during one hour interval starting at UT:
Aug | UT
1998 | 20h 21 22 23 00 01 02 03 04 05 06
------+------------------------------------------------------
1- 2 | 63 30 57 78 80 91 77 108 129 67 63
2- 3 | 37 59 53 95 80 94 81 136 77 121 83
3- 4 | 23 53 44 61 80 106 86 94 91 128 65
4- 5 | 50 68 42 63 61 52 94 ? 111 68 61
5- 6 | 43 65 88 85 76 95 98 114 131 ? ?
6- 7 | ? ? 60 66 70 71 95 122 81 ? ?
7- 8 | 88 46 69 58 59 72 89 84 44 ? ?
8- 9 | ? ? ? 67 81 55 57 70 72 71 38
9-10 | 65 36 111 58 74 64 66 86 63 62 ?
10-11 | ? ? ? 93 83 66 98 92 73 ? ?
11-12 | ? ? 101 79 106 101 68 120 91 ? ?
12-13 | 212 151 114 174 146 234 269 306 173 187 180
13-14 | 127 184 140 119 148 163 184 139 155 133 181
14-15 | 21% 81 22% 10% 13% 4% 6% 2% 0% 12% 6%
15-16 | ? 35 21 71 87 106 154 133 127 101 61
16-17 | - - - - - - - - - - -
17-18 | 64 55 58 81 59 158 141 107 105 64 95
18-19 | ? ? ? ? 64 89 105 114 111 77 65
19-20 | 47 75 61 63 92 76 112 111 110 ? ?
20-21 | 41 72 46 70 62 81 90 84 108 73 76
21-22 | 38 52 77 80 82 99 106 119 188 103 88
22-23 | 52 68 51 75 72 47 87 101 105 96 73
23-24 | 16 34 38 35 46 47 57 89 60 49 87
24-25 | 11 39 49 56 86 86 119 100 101 115 91
25-26 | 29 51 55 39 46 48 85 85 57 70 76
26-27 | 18 41 56 63 38 19 27 26 20 40 39
27-28 | 19 31 47 72 61 84 118 67 72 82 77
28-29 | 60 56 53 52 70 70 67 92 97 88 77
29-30 | 31 52 74 59 74 90 103 128 115 119 75
30-31 | 50 56 43 70 67 87 121 99 133 102 82
31-01 | 48 53 57 83 62 84 101 125 127 131 103
------+-------------------------------------------------------
1998 | 20h 21 22 23 00 01 02 03 04 05 06
Aug | UT
Raw counts of reflections with a duration of at least 1.000 s
during one hour interval starting at UT:
Aug |
1998 | 20h 21 22 23 00 01 02 03 04 05 06
--------------------------------------------------------------
1- 2 | 20* 4 13* 17* 6 19* 14 19 23 5 8
2- 3 | 9* 11 11* 25* 15 8 5 28* 14 20 15
3- 4 | 5* 10 8 6 13 20 14 18 19* 31* 18*
4- 5 | 4 11 3 8 4 3 9 ? 31* 11 20*
5- 6 | 9* 13 15 11 16* 16 6 16 38* ? ?
6- 7 | ? ? 7 10 10 8 7 13 23* ? ?
7- 8 | ? 6 22* 8 13* 10 14 12 12* ? ?
8- 9 | ? ? ? 10 19* 8 7 6 5 6 13*
9-10 | 10 4 37* 7 13 8 10 15 15* 18* ?
10-11 | ? ? ? 13 15 17* 17 15 21* ? ?
11-12 | ? ? 16 17* 23* 20 17* 8 25* ? ?
12-13 | 53* 30 21 41* 24 55* 48 80* 40* 53* 36
13-14 | 28* 51* 41* 23 42* 32 36 20 26 39* 64*
14-15 | 2% 16 2% 4% 2% 0% 3% 0% 0% 6% 1%
15-16 | ? 16* 1 20* 8 25* 31* 18 34* 18 7
16-17 | - - - - - - - - - - -
17-18 | 16* 6 4 4 10 78* 22 16 19 7 28*
18-19 | ? ? ? ? 2 11 16 20 13 9 8
19-20 | 6 14 6 5 15 10 17 11 29* ? ?
20-21 | 3 9 8 3 4 8 8 10 18 2 11
21-22 | 3 9 5 6 11 16 17 7 54* 20 13
22-23 | 3 11 6 10 6 10* 7 14 7 12 9
23-24 | 6* 7* 2 1 2 5 7 18* 7 7 30*
24-25 | 2 3 5 8 9 5 16 9 12 16 11
25-26 | 5 10 4 5 5 4 11 12 3 15* 15
26-27 | 3 6 8 7 7 7* 4 6* 1 3 8
27-28 | 7* 3 6 6 3 11 8 2 9 11 18*
28-29 | 27* 8 1 9 10 7 6 9 7 10 1
29-30 | 6 9 16* 6 10 14 15 22 13 17 8
30-31 | 10 8 5 4 8 8 20 9 20 30* 25*
31- 1 | 12* 8 13 15 10 15 15 5 37* 45* 32*
------+-------------------------------------------------------
1998 | 20h 21 22 23 00 01 02 03 04 05 06
Aug |
Notes:
. ? probably affected by sporadic-E, direct reception.
. local time = UT + 2 hours.
. * warning for relative high number of long duration reflections,
an indication for potential stream activity.
. & potential outburst on July 18 between 2h10 - 2h25 UT (see RMOB9807)
. % yearly transmitter outage on Aug 15, indicating that one main
transmitter (Budapest) contributes to the received reflections.
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.
-------------------------------------------------------------
| Aug 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 | 119 89 116 82 39 81 63 101 92 103 64 129 159 210 82
1 | 123 95 129 101 52 84 74 109 135 87 105 133 250 148 107
2 | 136 94 165 93 58 138 87 105 124 126 120 155 323 247 130
3 | 180 143 166 102 89 148 159 156 171 106 108 183 353 206 117
4 | 121 148 136 107 61 84 79 32 232 115 64 143 315 244
5 | 121 76 101 110 45 33 64 22 114 97 34 73 296 141
6 | 97 71 75 85 82 53 48 27 98 58 68 114 273 191
7 | 71 54 46 41 60 20 51 21 26 39 29 61 173 104
8 | 53 90 55 34 51 25 60 61 47 54 31 87 232 145
9 | 79 48 51 38 40 26 32 32 61 56 32 81 148 117
10 | 95 72 55 56 40 28 50 35 37 38 107 155 179
11 | 66 55 21 28 50 49 96 64 30 37 109 146 85
12 | 37 34 22 14 22 14 56 65 32 52 172 95
13 | 17 32 16 9 28 20 41 44 61 65 48 208 94
14 | 13 35 15 8 17 20 15 47 25 40 37[343] 81
15 | 20 28 11 15 15 35 51 34 14 45[300] 78 62
16 | 33 32 26 15 41 21 49 80 51 187 38 36
17 | 11 16 24 48 20 30 39 39 146 64
18 | 16 34 33 29 41 37 56 53 178 58 56
19 | 43 26 33 11 26 45 7 46 41 61 159 89 62
20 | 26 48 24 32 23 77 66 62 25 78 175 81 39 61
21 | 31 21 32 29 35 20 25 13 45 22 31 117 138 52 44
22 | 47 37 41 18 51 46 45 50 76 51 49 137 109 58 39
23 | 64 107 41 43 61 52 56 66 84 63 60 145 88 73 41
---+------------------------------------------------------------
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
--------------------------------------------------------------
| Aug 1998 | 10x % reflec. time | horiz: day | vert: time UT |
--------------------------------------------------------------------
| 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
---+----------------------------------------------------------------
0 | 50 43 55 45 70 51 69 61 52 54 34 38 48 43 37 47
1 | 76 75 56 63 79 40 66 59 37 63 54 50 53 50 43 48
2 | 105 48 87 62 55 77 83 73 63 65 53 63 54 42 51 85
3 | 110 90 110 94 65 125 76 91 68 81 124 69 66 51 63 70
4 | 180 80 100 68 56 100 114 64 81 78 72 63 62 69 63 66
5 | 116 63 50 61 46 48 78 79 128 102 48 74 74 63 65 59
6 | 72 82 62 42 62 74 60 55 45 74 75 53 61 76
7 | 58 22 47 48 51 68 46 91 32 72 43 68 61 25
8 | 86 21 42 109 54 62 43 53 32 78 58 58 39 31
9 | 67 31 38 42 122&111 79 16 57 53 54 39 77 74 26
10 | 60 51 26 174& 48 47 23 28 43 19 57 54 39
11 | 83 42 32 40 63 45 34 55 34 26 25 52 46 17
12 | 56 25 19 12 23 58 58 36 14 21 16 10 24 39 34 15
13 | 27 20 22 8 15 49 30 45 27 20 40 9 44 26 22 9
14 | 15 16 10 13 15 43 22 15 21 19 7 28 23 24 8
15 | 22 14 15 12 13 26 14 21 12 14 12 7 10 18 16 14
16 | 38 15 34 16 31 13 19 23 14 18 21 12 31 18 18 11
17 | 19 18 7 6 14 47 14 25 34 6 11 19 9 13 12
18 | 16 9 11 25 69 19 18 23 12 12 18 10 17 17
19 | 21 12 24 26 28 22 22 14 16 15 21 21
20 | 19 15 21 15 25 28 22 14 26 27 20 29 19 19 47
21 | 26 14 35 32 38 41 38 22 24 18 23 23 30 37 30
22 | 33 24 33 30 20 32 30 42 27 32 33 31 41 46 28 25
23 | 38 45 45 29 49 50 50 35 34 32 28 38 33 36 43 29
---+----------------------------------------------------------------
| 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
Notes:
. a difficult month with many periods with interference
. [] the secondary Perseids peak
. & stream activity on Aug 21, 9h - 11h UT?
Pierre De Groote
---------------------------------------------------------------------------
Observer: Ou Yang Tian Jing
Location: Wu Han, Hu Bei, P.R. of China (114 17' E, 30 30' N)
Frequency: 95.9 MHz
Transmitter location: FM of Korea
Antenna: 5-element Yagi, azimuth 315 deg, elevation 15 deg.
Receiver: receiver with digital tuner (DS R-3000)
Observing method: listening
| 1998 August
UT | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
---------------+-------------------------------------------------------
19h30m-20h00m | - 10 - 6 9 8 3 7 6 - - 8 6 5 10 -
20h00m-20h30m | - 11 3 8 13 10 11 6 - 7 3 5 4 2 6 4
20h30m-21h00m | - 1 1 2 11 - - 9 - 8 1 - 5 4 7 -
| 1998 August
UT |17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
---------------+----------------------------------------------------------
19h30m-20h00m | 6 3 2 3 - 8 2 4 8 3 - 4 4 8 5
20h00m-20h30m | 8 3 3 3 - 8 3 4 3 1 6 6 7 8 12
20h30m-21h00m | 9 2 5 3 - - 4 3 5 6 6 9 - - 6
Note:
. local time = UT + 8 hours
Jiang