Leonids 1998: Observational Results!
Sino-Dutch Leonid Expedition 1998


Team "XINGLONG": Radio Results


Leonids 1998

Observer        : Eisse Pieter (Peter) Bus
Location        : Lin Ting Kou, P.R. China
                  (117 degrees 30.3'E, 39 degrees 37.8'N)
                  85 km south of the Xinglong Observatory of 
                  Beijing Astronomical Observatory
Frequency       : 96.7 MHz
Transmitter
Location        : Zhengzhou, P.R. China, (114 degrees 55' E,
                  34 degrees 50' N), distance 581 km.
Antenna         : Dipole, geographical azimuth 204 degrees (WSW), 
                  elevation 17 degrees.
Receiver        : Sony ICF-SW7600 commercial receiver, 
                  sensitivity 0.8 uV.
Observation 
Method          : Listening and counting in 5-minute intervals.

Long lasting reflections > 1 sec on 16/17 november 1998.

Between 15h30m and 16h20m UT 10 long lasting reflections were
observed. After about 16h20m UT until about 3h20m UT almost 
completely saturation of the signals occured. Therefore no 
individual reflections were counted during this period.

Between 3h20m UT and 4h UT 21 long lasting reflections >1 sec 
were observed. On 4h UT the observations were ended.


Long lasting reflections > 1 sec on 17 november 1998.

Uncorrected hour rates starting at UT:

15h  16h  17h  18h  19h  20h  21h 
----------------------------------
4    5    6    4    6    4    3


Notes: 

Preliminary analysis for 16/17 November shows a flat high activity 
for about 20 hours with no distinguish peak. 
This activity is almost the same as observed with Radar in 1965.
On November 17, also no distinguish peak is observed.

For mid-point of the transmitter-receiver path counts:

Radiant is  rising on November 17 at about 15h30m UT.
Radiant is setting on November 17 at about 05h50m UT.
       
Most favourable antenna-geometry for detecting Leonids 
between 1h and 4h UT and between 17h30m and 21h30m UT.
Unfavourable antenna-geometry between 22h and 0h30m UT.

Peter Bus

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