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(meteorobs) Radio Meteor Obs. Bull. Aug 1998 2/2
---------------------------------------------------------------------------
Observer: Will Kelsey
Location: Santa Maria, CA, USA (120 26'9" W, 34 55'38" N)
Frequency: 98.5 MHz
Transmitter Location: Sacramento, CA. KRAK, 50 Kw at 362 km.
Antenna: Yagi FM 6 element. Heading North
Receiver: Sangean 803A
Observing Method: Listening to audio recording
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
_____________________________________________________________________
August
1998 hr-UT X-Dense B-Dense C-Dense ESA INT Total
----------------------------------------------------------------------
4CAP 1030-1130 1-0-0 1-0-1 4-4-6 29 None 17
5SIA 1145-1245 0-0-1 0-3-3 3-5-5 60 " 2
6 " 1200-1300 5-5-0 3-7-7 48 " 27
7 " 1220-1320 7-1-0 6-4-0 56 Hi 18
8 " 1200-1300 1-0-0 1-8-2 3-5-4 50 None 24
9PER 1015-1115 2-0-0 3-3-5 6-10-8 49 " 37
10PER 1015-1115 1-0-0 1-2-1 5-3-1 57 " 14
11 " 1015-1115 2-0-0 3-2-6 6-5-7 32 Lo 31
11 " 1400-1500 2-0-0 5-5-4 8-4-4 38 Lo 32
12 " 1000-1100 1-1-2 5-8-9 5-6-9 59 None 46
12 " 1400-1500 3-2-0 6-4-9 4-5-6 64 Lo 39
13 " 1000-1100 2-0-2 6-6-7 11-10-11 47 None 55
13 " 1400-1500 0-1-1 0-2-3 5-5-3 65 None 20
14 " 1000-1100 1-0-0 3-8-2 6-8-5 64 " 33
15PER 1000-1100 1-4-1 3-5-2 56 " 16
16 1100-1200 0-1-0 1-3-4 4-4-15 33 " 32
17 " " 3-3-3 5-7-9 40 None 30
18 " " 2-3-2 1-5-9 32 Lo 22
19 " " 2-0-0 2-5-2 9-7-8 43 None 35
20 1100-1200 1-1-3 4-10-13 47 Lo 32
21 " " 4-3-1 4-5-8 48 Lo 25
22 " " 1-3-1 4-3-1 54 None 13
23 " " 0-1-0 6-4-5 10-9-12 47 " 47
24 " " 1-4-0 5-2-4 69 Lo 16
25 " " 0-1-0 1-1-1 9-7-9 48 None 29
26 1100-1200 2-1-2 6-4-3 44 Med 18
27AUR " " 0-2-2 5-4-5 10-8-11 64 None 47
28 " " " 5-3-1 9-16-9 56 " 43
29 " " " 7-7-2 9-10-14 41 " 49
30 " " " 3-4-4 10-12-8 46 " 41
31AUR 1100-1200 0-3-1 3-7-6 10-19-7 50 None 56
----------------------------------------------------------------------
1998 hr-UT X-Dense B-Dense C-Dense ESA INT Total
August
Notes:
. activity period of streams
CAP: Capricornids
SIA: Southern iota Aquarids
PER: Perseids
AUR: Aurigids
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 53.76060 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 13 seconds, assumed to be overdense
| Aug 1998
UT| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
---+------------------------------------------------------------
0| 1 7 7 3 11 9 3 9 4 8 6 17 7 7
1| 6 6 8 2 11 7 6 8 5 10 7 12 7 4
2| 4 3 6 9 5 6 5 5 11 4 12 8 4 7
3| 12 4 10 7 5 7 6 3 12 6 20 13 15 7
4| 7 1 8 1 4 3 5 6 2 6 14 14 10 7
5| 0. 3 4 5 2. 2. 4 1 6 3 9 7 11 10 5
6| 5. 1 1 6 3 8 7 2 5. 2 3 13 5 7 4
7| 4 2 3 2. 4 1 7 0 3 4 11 9 2 5
8| 2 1 5 2 2 3 5 6 10 12 7
9| 4 2 1 4 2. 0 6 4 13 9 18. 12 4
10| 1 0 3 4 1 4 8 2 4 9 13 4
11| 0. 1 2. 0 0 0 0. 6 1 1 3 3. 7
12| 1 1 0 4 1 1 3 2. 3 2 5 4 5.
13| 2 5 0 2 1 1 1 3 3 0. 0 1 1 0 2.
14| 0 0 0 0 0 0 1 0 0. 3 6 3 2.
15| 0 0 0 0. 0 0 3 0 2. 12 1 0
16| 0 1 1 0 0. 0 0 1 5 0
17| 0 2 0 0 2 0 0 0. 4 4 2
18| 0 0 3. 0. 3 2. 0. 1 5 0. 1
19| 0 0 2. 2. 1 2. 1 2. 2 0
20| 3 0 1 0 3 1 3. 3. 0 4. 0 2.
21| 0 2 3 1 0 4. 1 2 1 2 7 10. 4 6
22| 5 8 1 2 5 7 2 0 3 5 8 7 1 0.
23| 1 11 2 8 3 3 2 4 10 4 9 7 2. 2
---+------------------------------------------------------------
UT| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
| Aug 1998
| Aug 1998
UT| 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
---+----------------------------------------------------------------
0| 7 2 2 5. 4 1 1 0 0 1 2 1 1 1 4
1| 11 4 3. 5 3 4 1 1 0 1 2 1 1 1 2
2| 8 2 5 1 1 1 1 1 4 0 1 3 1 2 1
3| 6 2 2 5 4 3 6 1 4 4 3 3 5 3 4
4| 4 3 4 5 2 6 3 0 3 1 2 3 1 3 0
5| 2 1 2 4. 4 4 1 6 4 3 2 0 0 0 5 4
6| 4 1 1 2 1 5 3 5 4 1 4 2 4. 5
7| 3 1 5 2. 3 0 1 1 1 1 0 3 1 1
8| 4 7 4. 4 1 3 1 0 3 1 0. 1 4
9| 0. 0 2. 0 2 0 0 0 0 1 3 0
10| 1 0 0. 1 0. 0 1 3 3 0 3 0. 1
11| 0 0 1 0. 4 2. 1 0 1 0 1 0 0
12| 0. 3 0 1 4 1 0 0 0. 3 0 0 0 0 1
13| 1 0 0 1 0. 1 0 0 0 0 0 0. 0 0 0 0
14| 0. 0 0. 0 1 0 1 1 1 0 0 0 0 1 1 1
15| 1 0 0 0 0 0 0 1 0 1 0 0 0.
16| 0 0 0 0 0 0 0 0 0 0 0
17| 2. 0. 0 0 0 0. 0 0 0 2. 0 0.
18| 1 0. 0. 0 3 0. 4 0. 0. 0 0. 0 0 0. 0
19| 1 0. 0. 0 0 0 0 1 0 0
20| 0. 0 0 1 0 0 0 0.
21| 1 0. 4. 0 1 2. 0 1 0 0 1 0
22| 3 0 0. 2 2 0 1 0 0 0 1 0 0 1 0
23| 2 2 2 1 3 3 2 2 1 1 4 1 1 0 1
---+----------------------------------------------------------------
UT| 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
| Aug 1998
Propagation overview for August 1998
E : Sporadic-E or E-layer propagation
F : FAI (field aligned irregularity)
- : Propagation only via meteor echos.
| Aug 1998
UT| 1 2 3 4 5 6 7 8 910111213141516171819202122232425262728293031
---+--------------------------------------------------------------
0| - - - - - - - - - - - - - - - - - F - - - - - - - - - - -
1| - - - - - - - - E - E - - E - - - - - - E - - - - - - - - -
2| - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
3| - - - - E - - - - - - - - - - - - - - - - - - - - - - - -
4| - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
5| - - - - - E - - - - - - - - - - - - E - - - - - - - - E - - -
6| - - - - - - - - - - - - - - - - - - E E - - - - - - - E - - E
7| - - - - - - - - E - - - - - E - - - E E - - - - - - - - - - E
8| - - - E E - - - E - - - - - E - - E E E - - - - - - - - - - E
9| E - - - E - - - E - - - - - E E E E E E - E - - - - - - - - -
10| - - - - - - E - E - - - E - E E E - - - - - - - - - - - - - -
11| E - E - - - E - E - - - E E E E E - - - - - - - E - - - - - -
12| - - E - - - - - E - - - - - - E E - - E - - - - E - - - - - -
13| - - - - - - - - - - - - E - - - - - - E - - - - - - - - - - -
14| - - - - - - - - E E - E - F - - - - - - - - - - - - - - - - -
15| - - - - - - - - E - - - - - - - - - - - - - - - - - - - - - -
16| - - - - - E - E - - - - - - - - - - - - - - - - - - - - -
17| - - E E - - E - E E - - E - E E - E - - - - - - - - - - -
18| - - E E E - E - - E - - - - E - F E - - - - - - E E - - - -
19| - - E F - - E F - F - E E - E F E E - - - E F E F E - - F F
20| - - - - - F E - F F F E - - F F F E E - E - E F E - - F - E F
21| - F - E - F - F - - F F - F F F F E E - E - F F - - - E - E -
22| - - - E - - - - - - - - - - E E - F E - - E F - - - - E - E -
23| - - - - - - - - - - - - E - - - F E - - - - - - - - - - - -
---+--------------------------------------------------------------
UT| 1 2 3 4 5 6 7 8 910111213141516171819202122232425262728293031
| Aug 1998
Notes:
. no other correction except for "dead time" is used in the counts shown.
. The Perseids showed just normal activity on August 12 and 13.
The first peak seems to have occured at 14h-15h UT on Aug. 12
. The Sun (speaking of sporadic-E and FAI) is more active this time
than in last years, but left the meteor counts unaffected, except
for the reduced observation time.
. local time conversion: 2 hour ahead of UT (04h00 UTC is 06h00 local)
. The above report is just a short version. Anybody interested in the
full report, which is quite lengthy (with counts duration
distribution, total reflective time, fireball times, detailed
classification of each single recorded picture) is available by
e-mail (see below, useful addresses).
. while the Perseids were at maximum on Aug 12 a spectacular fireball
with a visual magnitude of -12 showed up over Udine, Italy, which was
also very well recorded at Ferndorf, Austria and Udine, Italy by
means of FFTDSP. Time: 21h49m14s UT on Aug 12, 1998. A more
detailed report as well as the recorded spectrograms (29 kB) are
available by e-mail.
Werfried Kuneth
---------------------------------------------------------------------------
Observer: Sadao Okamoto
Location: Damine Meteor Observatory, Japan (137.53 E, 35.07 N)
Transmitter: HAM beacon (JA9YDB) for RMO (50 W CW, 53.7500 MHz) by
JA9BOH Kimio Maegawa. No modulation except for identification.
Antenna: 2 element Cross Yagi 4 dBi aiming to Zenith. Omni-directional
in azimuth and elevation above 15 deg elevation.
Location: Fukui-NCT at Sabae city (136.2 E, 35.9 N)
At present time about 10 observers are listing for
Kimio Maegawa's 53.75 MHz beacon.
Receiver: IC575
Antenna: 2 element Yagi, pointed to the zenith.
Observing method: FFTDSP software, manual count.
Hourly echoes over 10 dB SNR
1998
Aug| 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23JST
Aug| 15 16 17 18 19 20 21 22 23 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 UT
---+---------------------------------------------------------------------------
01| 85 84 68101 85 69 61 e e e e 9@27 -- 29 n 19 14 10 15 20 35 53@60
02| 78 65 81 74101 71 55 63 32 38 n 21 15 19 9 17 19 22 14 13 24 41 53@71
03| 60 71 61 85 70 54 86 43 30 35@24 e e e e 23 12 19 e e 18 24 37@60
04| 66 71 72 62 83 73 57 40@31 e e@12@30 30 13 5 12 10 9 11 23 28 52@67
05| 61 74 70 77 79 71 60 46 36 25 20 25 22 21 n@13 14 10 9 16 17 40 68@66
06| 70 57 70 75 76 66 59 46 26 32@24 e@20 34 26 17 18 8 9 23 21 37 42@49
07| 59 70 51 61 72 75 67 33 44 30 20 29 36 e e n 14 21 20 19 15 28 40@46
08| 73 71 65 f
09| f
10| f f e 22 25 26 17 23 e e e 10 18 31 38@52
11| 56 63 53 85 80 81 75 56 42 30 e e e 27 18 13 16 17 12 17 19 26 42@49
12| 55 64 67 75 82 73 72 52 e 27 e e e 29 19 17 17 17 16 12 27 32 59@85
13| 98 76 93 88 92 83 95 68 43 40 21 21 29 35@16 24 13 19 20 16 24 34 55 --
14| 67 69 67 92100 82 64 65 54 37 37 41 19 30 25 23 12 17 12@14@29 35 53@43
15| 61 48 78 76 67 62 91 52@32 e 36 e@13 25 27 15 23 14 15 10 26 29 46@44
16| 48 44 60 59 40 64 57@52 e e e e e 20 13 21 26@16 16 10 22 38 45 --
17| 63 54 55 66 54 54 31 48 23 13 14 13 15 17 18 19@15 e 11 13 32 32 40@47
18| 35 43 52 56 44 45 39 38 33 25 20 19 23 25 n 20@12 18 13 20 18 32 51@41
19| 43 53 50 51 43 35 44 39 27 24 26 26 22 19 17 n n@24 e 11 17 27 33@43
20| 50 43 43 42 44 45 46 31 25 23 25 20 11 14 14 16 17 18 10 17 22 38 34@44
21| 44 31 56 55 47 52 47 38 26 n 18 12 24 24 12 19 17 17 9 12 25 41 41@37
22| 44 50 48 39 47 58 55 35 36 17 18 13 13 26 20 13 23 19 13 16 31 34 41@49
23| 39 48 58 58 65 49 49 52 36 30 25 n@19 13 13 10 24 12 e e 23 32 38@38
24| 48 51 51 72 74 51 48 45 32 28 23 29 e 34 21 -- 18 17 16 13 19 37 43@46
25| 39 38 41 44 40 48 54 30 33 28 21 17 24 29 19 18 17 15 14 15 21 32 42@37
26| 42 56 n 54 42 39 46 28 36 39 33@35 e 36 32 22 32 17 12 21 16 23 35@38
27| 43 52 46 57 51 42 57 39 37 25 32 32 28 26 18 22 16 13 11 15 21 32 44@31
28| 42 41 51 56 49 52 37 39 43 19 30 24 26 18 15 22 18 13 15 19 24 32 40@37
29| 46 42 40 61 53 44 55 37 44 35 23 33 23@27 26 30 22 16 17 9 32 29 39 --
30| 41 40 44 58 61 58 49 52 47 31 21 23@25@33 17 23 21 17 23 10 22 23 39@42
31| 43 48 53 54 41 56 58 48 31 31 20 16 26 26 15 23 12 10 16 19 15 21 42@41
---+---------------------------------------------------------------------------
Aug| 15 16 17 18 19 20 21 22 23 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 UT
Aug| 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23JST
1998
Echoes with duration > 5 s
1998
Aug| 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23JST
Aug| 15 16 17 18 19 20 21 22 23 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 UT
---+---------------------------------------------------------------------------
1| 4 6 7 10 9 3 5 1 3 2
2| 2 7 11 15 20 10 1 4 2 3 1 5 1
3| 4 6 8 7 6 4 6 3 3 1 1 1 2 6
4| 10 6 9 9 13 13 2 5 3 1 2 2 1 1 4
5| 5 4 14 8 11 15 12 1 2 3 2 4 1 3 1 1 1 1 2 3
6| 5 10 7 7 8 6 5 5 3 3 3 1
7| 4 6 6 5 10 7 10 3 3 3 3 3 1 2 1 2 5
8| 9 16 7 f
9| f
10| f 2 1 1 5 1 3
11| 5 8 9 21 11 14 7 11 3 5 1 1 1 1 5 4
12| 7 11 15 14 14 21 20 15 3 1 1 4 6@20
13| 24 24 32 35 25 28 26 18 16 10 2 3 4 2 1 2 5 5 --
14| 15 12 12 27 26 23 18 10 10 7 10 7 3 1 1 2 1 3
15| 5 5 13 9 18 14 13 9 7 3 1 3 1 2 1 1 4 1
16| 4 3 3 9 5 17 7 8 1 4 1 2 --
17| 7 3 8 4 5 4 2 7 2 3 1 2 1
18| 4 3 4 2 2 3 2 1 2 1 2
19| 2 2 4 2 1 5 2 2 3 2 1 1 2
20| 3 6 1 2 5 4 3 3 1 1 1 1 1 1 1
21| 2 4 3 2 2 5 3 2 2 3 1 2 2 1 2 1 2
22| 1 1 4 2 4 3 2 2 2 1 1 1 1 1 2 1 2
23| 1 4 6 1 5 12 2 4 3 3 2 1 2 1 1
24| 1 3 3 5 3 4 3 1 4 1 1 1 1 1 1
25| 3 3 5 4 4 1 6 1 4 1 1 6 1 1
26| 4 3 3 3 1 2 3 3 3 3 2 2 3 1 2 3 1
27| 4 4 4 5 2 3 3 8 1 3 3 1 2 1 1 3 1
28| 2 5 6 6 3 3 1 1 3 1 1 1 1 2 2 1 2 2 2
29| 1 4 2 7 3 1 4 4 2 3 1 1 1 1 1 1
30| 1 5 4 5 4 7 3 11 2 1 1 1 2 1 1 2
31| 2 1 3 2 5 4 1 2 1 2 1 2 1 1 1 1 2 3 4
---+---------------------------------------------------------------------------
Aug| 15 16 17 18 19 20 21 22 23 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 UT
Aug| 00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23JST
1998
Daily rate of long echoes (T > 20 s)
1998
Aug 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
-----------------------------------------------------------------
Count 5 12 7 7 13 13 17 f f (4) 23 47 69 54 23
Aug 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31
---------------------------------------------------------------------
Count 16 7 3 6 3 5 2 2 5 3 4 2 5 3 8 3
Notes:
-: lost counts because of high noise level or machine failure.
@: hourly rate estimated by effective observation time less than 60 min.
n: contamination due to radio noise.
e: contamination due to sporadic E opening.
f: no data available due to TX or RX failure.
Between Aug 8 and Aug 10 there were problems with the transmitter and
no valid data were recorded.
JST = UT + 9 h
Sadao Okamoto / via Kimio Maegawa
---------------------------------------------------------------------------
Observer: Ton Schoenmaker
Location: Roden, Netherlands (06 26' E, 53 08' N)
Frequency: 77.257 MHz
Transmitter: Kielce, Poland; 100 kW, horizontal polarization
Antenna: 4-element horizontal Yagi, geographical azimuth 105 degrees (ESE),
elevation 15 degrees
Receiver: home-made convertor followed by Barlow-Wadley XCR-30 Mark II;
total sensitivity 0.3 uV for 20 dB S/N, bandwidth 3 kHz
Observing: rectified signal from 455 Khz I.F. recorded with a Servogor
strip-chart recorder with a chart speed of 120 mm/hour
Because of the uncertain status of the Polish FM transmitters, possible new
transmitter candidates were investigated amongst the TV carriers of the East-
European band RIII. A more or less isolated carrier was found at 77.257 MHz,
probably a TV station in Kielce, Poland. It is a pity that the station shuts
down irregularly, although this shutting down is a good check on false
recordings.
The following table gives the uncorrected counts of signals stronger than
0.3 uV (column "A") and counts of signals lasting longer than 15 seconds and
peaking to at least 0.1 uV (column "B"). The counts of long lasting "B"
signals are a better indicator for the "new" peak around 12 August 15h UTC.
August 1998
| 10 | 11 | 12 | 13 |
UTC | A B | A B | A B | A B |
----+-----------+------------+------------+------------+
03 | | 26 5 | 17 4 | |
04 | | 29 9 | 24 10 | 51 16 |
05 | | 23 8 | 26 16 | 52 22 |
06 | | 26 7 | 34 16 | 42 13 |
07 | | 24 2 | 26 10 | |
08 | | | 12 7 | |
09 | | | 5 6 | |
10 | | | 22 6 | |
11 | | | 13 6 | 46 10 |
12 | | | 17 6 | 39 5 |
13 | | 20 2 | 17 14 | 26 5 |
14 | | 20 1 | 22 13 | 28 3 |
15 | | 19 1 | 26 16 | 23 3 |
16 | | 11 1 | 39 10 | 26 2 |
17 | 27 2 | 24 3 | 34 7 | 21 4 |
18 | 17 2 | 22 2 | 22 12 | 22 3 |
19 | 19 1 | 21 4 | 35 8 | 21 1 |
20 | 24 0 | 16 4 | 34 5 | |
21 | | | 42 16 | |
----+-----------+------------+------------+------------+
UTC | A B | A B | A B | A B |
| 10 | 11 | 12 | 13 |
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.
Aug | UT
1998 | 11 12 13 14 15 16 17 18 19 20 21 22 | *(1) **(2)
------+-------------------------------------------------+-----------
1 | 20 19 27 39 33 33 42 46 43 39 30 30 | 28.5 38.3
2 | 12 27 30 49 36 44 40 38 37 36 28 25 | 33.0 34.0
3 | 12 18 22 26 30 27 40 31 28 28 22 9 | 22.5 26.3
4 | 16 18 30 30 37 43 35 37 31 26 20 | 26.2 32.0
5 | 11 17 20 25 27 27 25 22 21 26 22 22 | 21.2 23.0
6 | 10 16 23 22 26 35 34 42 35 30 25 25 | 22.0 31.8
7 | 11 14 27 21 36 15 33 25 24 28 28 21 | 20.7 26.5
8 | 8 16 19 22 24 | 17.8
9 | 13 21 29 27 13 24 24 30 17 16 | 22.5 20.7
10 | 9 11 13 18 18 26 28 27 26 22 24 19 | 15.8 24.3
11 | 10 17 12 21 31 33 30 41 38 41 25 26 | 20.7 33.5
12 | 23 35 29 45 44 52 50 53 43 24 26 39 | 38.0 39.2
13 | 16 20 30 27 29 36 43 38 39 37 26 25 | 26.3 34.7
14 | 11 27 27 26 16 24 20 21 17 20 26 19 | 21.8 20.5
15 | 19 12 28 22 27 25 26 34 34 35 22 22 | 22.2 28.8
16 | 12 16 17 18 25 24 28 20 17 | 17.6 22.3
17 | 11 18 22 24 20 | 19.0
18 | 17 18 13 24 22 20 25 20 23 17 | 18.0 21.2
19 | 13 18 20 19 14 24 24 23 27 19 18 20 | 18.0 21.8
20 | 8 16 24 24 21 18 23 21 19 21 15 | 18.6 19.5
21 | 12 13 19 15 17 19 23 22 22 20 26 16 | 15.8 21.5
22 | 16 22 22 21 11 19 15 19 15 16 16 16 | 18.5 16.2
23 | 11 16 20 14 14 19 22 16 17 21 21 17 | 15.7 19.0
24 | 14 16 24 19 23 22 28 18 | 18.0 22.0
25 | 16 22 19 17 20 22 23 21 23 20 19 21 | 19.3 21.2
26 | 8 22 19 15 21 27 20 20 22 20 19 | 18.7 20.2
27 | 8 15 16 20 16 18 17 21 25 28 18 21 | 15.5 21.7
28 | 13 16 16 18 19 19 25 38 18 21 27 22 | 16.8 25.2
29 | 16 16 20 19 15 21 25 22 24 28 24 19 | 17.8 23.7
30 | 14 18 14 15 14 13 11 21 14 21 16 19 | 14.7 17.0
31 | 11 10 13 23 22 13 16 16 17 13 13 10 | 15.3 14.2
------+-------------------------------------------------+-----------
1998 | 11 12 13 14 15 16 17 18 19 20 21 22 | *(1) **(2)
Aug | UT
* (1) average hourly rate between 11h-17h UT
**(2) average hourly rate between 17h-23h UT
. local time = JST = UT + 9 hours
Chikara Shimoda
---------------------------------------------------------------------------
Observer: Ilkka Yrjola
Location: Finland (26 35' E, 60 54' N)
Frequency: 88.8 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-el. Yagi, G=4 dBd to SW, azimuth 45 deg (SW), polarisation H.
Data sampling system: threshold triggering, sampling rate 32 ms.
Computer logs total hourly elapsed reflection time, number of
triggers for the hour, the longest time the signal was
continuously above detection level for the hour.
Data on major showers available in the Compact MS-Soft format.
Software for viewing available from
www.saunalahti.fi/~oh5iy/radio50.zip (754 K).
Perseids 1998
Meteor counts in one hour intervals starting at:
UT | 11 Aug 12 Aug 13 Aug 14 Aug
----+----------------------------------
0 | 230 691 775 823
1 | 420 546 991 656
2 | 421 483 1058 519
3 | 498 476 1014 755
4 | 319 584 1029 736
5 | 351 586 1236 535
6 | 457 849 768 856
7 | 514 723 1067 689
8 | 339 928 1328 628
9 | 509 739 1243 450
10 | 412 923 894 667
11 | 379 650 730 323
12 | 390 553 895 541
13 | 404 882 494 Es
14 | 284 1569 339 456
15 | 209 1314 389 331
16 | 163 962 339 233
17 | 191 651 279 133
18 | 227 957 289 242
19 | 161 539 224 213
20 | 360 720 532 268
21 | 316 613 533 270
22 | 396 1095 712 321
23 | 447 683 744 428
----+----------------------------------
UT | 11 Aug 12 Aug 13 Aug 14 Aug
. sporadic E on Aug 14
Ilkka Yrjola
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
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3. 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
Eisse Pieter Bus
Groningen, Netherlands
E-mail: epbus@wxsdot nl
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
Ou Yang Tian Jing
Wu Han, Hu Bei, P.R. of China
E-mail: jxpsky@neasedot net and jiangxph@public.wh.hb.cn
http://www.neasedot net/~jxpsky
H. W. Kelsey, A.L.P.O.
Santa Maria, CA, USA
E-mail: 73073.1464@compuserve.com
Werfried Kuneth
Ferndorf, Austria
E-mail: kuneth@netway.at
Alastair McBeath
IMO: International Meteor Organization
12A Prior's Walk, Morpeth, Northumberland, NE61 2RF, England, U.K.
E-mail: via Chris Steyaert
Sadao Okamoto
E-mail: okamoto@jim.sugiyama-u.ac.jp
Ton Schoenmaker
Meester Homanstraat 8, NL-9301 HP Roden, Netherlands
E-mail: schoenmaker@server4.nfradot nl
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 (RMOB9808) 7 September 1998
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