Title :
Rapid changes in depolarization due to thunderclouds obtained from the CS-3 beacon signal observation
Author :
Maekawa, Y. ; Chang, N.S. ; Miyazaki, A. ; Segawa, T.
Author_Institution :
Osaka Electro-Commun. Univ., Neyagawa, Japan
Abstract :
In August and September 1990, several ice depolarization events associated with summertime thunderclouds were observed at the CSK Osaka earth station using the CS-3 beacon signal (19.45 GHz, RHCP, EL=49.5 degrees ). The observation of the CS-3 beacon signal has revealed characteristic changes in XPD (cross-polarization discrimination) and cross-polar phase caused by high-altitude ice crystals in thunderclouds. In light of recent thunderstorm electrification theory and other thundercloud observations, these kinds of rapid changes are related to the intercloud discharge near the cloud top, which does not necessarily correspond to the lightning flashes seen on the ground. The impact of thunderstorm events upon dual-polarization satellite communication links using linear horizontal and vertical polarizations is considered.<>
Keywords :
clouds; electromagnetic wave polarisation; ice; radiowave propagation; satellite relay systems; thunderstorms; tropospheric electromagnetic wave propagation; 19.45 GHz; CS-3 beacon signal observation; CSK Osaka earth station; SHF; cross-polar phase; cross-polarization discrimination; dual-polarization satellite communication links; high-altitude ice crystals; horizontal polarisation; ice depolarization events; intercloud discharge; summertime thunderclouds; vertical polarisation; Aerodynamics; Attenuation; Clocks; Clouds; Crystals; Ice; Phase detection; Polarization; Radar scattering; Satellite ground stations;
Conference_Titel :
Antennas and Propagation Society International Symposium, 1992. AP-S. 1992 Digest. Held in Conjuction with: URSI Radio Science Meeting and Nuclear EMP Meeting., IEEE
Conference_Location :
Chicago, IL, USA
Print_ISBN :
0-7803-0730-5
DOI :
10.1109/APS.1992.221825
