2002年獅子座流星雨 龍潭觀測報告

自10月開始,2002年的獅子座流星雨就開始進行準備工作.因為使用已4年的天線這半年來雜訊一直無法有效清除,於是趕緊更換新的天線.以防影響觀測結果.龍潭近一年來雜訊也開始增多,一些是來自E層反射電視訊號和一些人為電波外(晚上),附近的工廠也有一些干擾(白天)...

在10月初,日本流星協會也來信邀請站長加入此次國際觀測活動.日流協會在筑波大學小川先生和京都大學的中村卓司先生努力下,在這幾年開始邀請國際間一些電波觀測站合作觀測.本站也自2年前開始參加亞州地區觀測網.另有中國和韓國,澳洲等觀測站陸續加入.

今年的獅子座流星雨在IMO的預報下,亞洲地區不是極大期的觀測地區.所以無法測得極大期是可預見的.但可以觀測地球進入彗星塵埃前的分佈情況,此次台灣地區尚有台北市立天文科學教育館HRO觀測站和師大附中的學生天文社團HRO組分別在不同點一起觀測.待結果出來後再另外報告.

11月18日,台灣地區因東北季風加強,整個北部都是陰雨潮濕的天氣,肉眼等光學觀測都無法進行.18日晚上,龍潭地區整夜下雨,但3組電波觀測團隊仍進行24小時監測流星動向.龍潭站自11月9日開始觀測至21日結束工作.結果報告如下:

*.圖左上:19日早上的龍潭觀測站,雖然天氣  還在下雨,但仍在忙錄觀測流星雨.

*.圖右上:觀測室內的兩部電腦一直24小時即時分析流星信號和紀錄工作.

*.圖左:19日早上9點,電腦上仍分析出有大量流星進入大氣層...

上圖為9日到22日的HR曲線圖.下為觀測數據和較大流星出現時間表.

2002 Leonids at AS0238(LongTan Observatory) 50.0169MHz(by Young Chiech Tsao)

Observer:    Young Chiech Tsao (BM2EQB)

Location:    LongTan Observatory

LonTan, TauYan, Taiwan R.O.C. (121 14'37" E, 24 52'54" N by GPS)

Frequency:   50.0169 MHz USB mode 3 kHz width.

Antenna:     Comet made 50 MHz Yagi HB 4 element (gain 10.3 dBi)

             astronomical azimuth 225 deg (=NE), elevation 7 deg.

Transmitter: MIYAZAKI University Japan, USB mode, 50 W (24 hours),

             distance about 1125 km from Lon Tan.

Receiver:  ICOM R-75  all band receiver

Sensitivity: 0.25 uV for 10 dB S/N  for USB mode

Observing method: the beacon 1000 Hz voice signal (by FFTDSP) is

             received by a low frequency filter (1000 Hz)and fed into

             the D/A converter and computer in real time.

Data sampling system: using an 8 bits A/D card to PC/AT and Qbasic program with 1/8 second sampling interval to store the> 1.0 s reflections.

     November 2002

LT  08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23 00 01 02 03 04 05 06 07

UT  00 01 02 03 04 05 06 07 08 09 10 11 12 13 14 15 16 17 18 19 20 21 22 23

 9/                                     03 03 05 04 06 04 05 03 06 09 09 20 17 18 20 19 15           

10/ 21 24 19 14 15 11 11 02 08 07 07 09 07 11 09 05 05 10 13 18 18 15 14 15

11/10 05 07 02 06 04 07 03 04 09 08 11 09 08 13 13 04 12 22 14 24 24 17 12

12/20 23 09 16 03 in  07 04  in  07 10 05 09 08 14 12 10 16 19 06 17 23 28 27

13/ 17 10 14 12 05 07 03 06 07 06 08 07 08 11 07 08 08 14 08 21 15 23 10 11

14/ 09 06 07 12 09 12 06 05 03 04 07 06 04 05 08 15 08 12 13 18 20 12 19 13

15/ 21 05 16 04 10 08 04 04 in  09 04 03 06 03 04 07 12 12 17 17 26 29 18 16

16/ 15 12 15 07 11 08 07 04 04 03 04 09 07 08 06 07 15 19 21 27 26 21 20 27

17/ 21 26 19 10 09 07 04 03 04 11 14 14 08 09 09 07 04 12 07 12 12 06 19 08

18/ 16 22 15 08 11 09 06 05 05 04  in  in  in  06 04 07 07 10 22 52 54 55 48 63

19/ 58 32 42 39 32 12 11 09 06 04 11 10 15 22 07 18 28 24 23 26 17 27 20 15          

20/ 19 35 32 25 17 13 06 02 03 06 07 09 11 07 12 11 12 17 13 13 24 26 18 21

21/ 22 16  in  in  17 12 06 02 02 07 06  in  in  in  in  in  08 09 21 27 18 25 24 19

Notes:

.  "IN=(local) artificial interference.

.  "E" = sporadic E layer mode of reflection.

    ?.suspect  peak for shower or Es

*.Date and Time system is in accordance with  UT system and the time difference is 8hour from Taiwan

(UT+8).

ECHO STRENGTH LIST/ *LT=Local Time (UT=LT-8)

DATE(LT)  TIME(LT)    STRENGTH(dBi)   CONTINUED TIME(sec)

------------------------------------------------------------------------------ 

 1102       16h33m         20                               

 1103       04h56m                        120

 1103       05h49m         20            60

 1103       06h09m         20            60

 1103       11h56m         20

 1110       00h19m                          60

 1110       03h03m         20

 1110       05h22m         20

 1110       11h03m         20

 1110       13h20m         20

 1111       03h01m         20             60

 1111       06h01m                          60

 1111       07h01m         20

 1112       02h09m         20

 1112       05h43m                          60

 1112       10h04m                          60

 1113       00h05m         20

 1113       08h04m                          60

 1114       00h02m                          60

 1115       03h09m         20

 1115       04h05m                          60

 1115       04h35m         20

 1115       05h45m                          60

 1115       15h08m         20

 1116       03h03m                          60

 1116       06h51m                         120

 1116       08h16m                          60

 1116       08h17m                          60

 1117       04h14m         20

 1117       05h57m                          60

 1117       07h23m                         120

 1118       06h04m                          60

 1118       06h07m                          60

 1118       06h12m                          60

 1118       06h17m                         180

 1118       06h31m                         120

 1118       06h42m                         120

 1118       06h48m                         180

 1118       07h14m                         360

 1118       07h21m                         240

 1118       07h30m                         180

 1118       07h47m                         120

 1118       07h54m                         120

 1118       08h02m                         480

 1118       08h17m                         120

 1118       08h26m                          60

 1118       08h28m                         120

 1118       08h33m                         120

 1119       02h55m                          60

 1119       03h45m                         180

 1119       04h24m                         180

 1119       04h44m                         120

 1119       04h50m                         120

 1119       05h38m                         120

 1119       05h50m                          60

 1119       09h02m                          60

 1119       09h06m                         120

 1119       09h16m                         120

 1119       09h24m                         240

 1119       09h32m                         180

 1119       09h38m                         120

 1119       09h41m                          60

 1119       09h48m                         120

 1119       09h54m                         120

 1119       10h06m          20

 1119       10h09m          20

 1119       10h11m                         120

 1119       10h23m          20

 1119       10h25m                         120

 1119       10h33m                         120

 1119       10h52m                         120

 1119       10h55m                         120

 1119       11h01m                         120

 1119       11h11m          20             120

 1119       11h37m          20

 1119       11h43m                         120

 1120       00h03m                         120

 1120       03h25m                         120

 1120       03h54m                          60

 1120       05h50m                         120

 1120       07h05m                         120

 1120       07h18m                         120

 1120       11h07m                          60

 1121       06h22m         20

 1121       08h53m         20

 1121       08h56m         20

 1122       02h31m                          60

 1122       04h28m         20

 1122       08h14m         20

 1122       08h58m         20     

-----------------------------------------------------------------------------                

*.no strength of data means the strength is under 20dBi

 以上文字和數據為龍潭觀測站所有.