Occurrence statistics and drifts of daytime 150-km echoes studied using observations from the Equatorial Atmosphere Radar in Indonesia and ionosonde network

Details Occurrence statistics and drifts of daytime 150-km echoes studied using observations from the Equatorial Atmosphere Radar in Indonesia and ionosonde network Occurrence statistics and drifts of daytime 150-km echoes studied using observations from the Equatorial Atmosphere Radar in Indonesia and ionosonde network

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsa13a1472m&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SA13A-1472

Physics

[2415] Ionosphere / Equatorial Ionosphere, [2439] Ionosphere / Ionospheric Irregularities

Scientific paper

Between 130 and 170 km altitude in the daytime equatorial ionosphere, the so-called 150-km FAIs (Field-Aligned Irregularities) have been observed since 1960’s with several VHF radars, but generation mechanisms of the 150-km FAIs are still unknown. We report statistical results of the 150-km FAIs observed with the Equatorial Atmosphere Radar (EAR) at Kototabang, Indonesia. Since August 2007, 150-km FAIs measurements have been carried out with the EAR for 5-10 days every month. By analyzing the 150-km FAIs observed with the EAR during a period from August 2007 to August 2009, we have revealed statistical characteristics of the 150-km FAIs over Kototabang. The results can be summarized as follows. 1) We investigated the vertical and zonal Doppler velocity of 150-km FAIs. The averaged vertical Doppler velocity increased in the morning, reached a maximum (21m/s) around 10LT, and then decreased in the afternoon. This feature is consistent with the empirical model of vertical plasma drifts in the F-region [Scherliess and Fejer, 1999]. The averaged zonal Doppler velocity of the 150-km FAIs observed with the EAR is westward. Its amplitude is smaller than the F-region zonal drift velocity measured by Jicamarca incoherent scatter radar [Fejer et al., 1991]. 2) We found that occurrence rate of the daytime 150-km FAIs over Kototabang exceeded 50% between a periods from May to December, but that the FAIs were hardly observed in March and April. These seasonal variations are consistent with that of occurrence rate in sporadic E layer at Kototabang. We also investigate occurrence rate of sporadic E layer at Chumphon and Chaing Mai, Thailand. Chaing Mai is located at the geomagnetic conjugate point of Kototabang, and Chumphon is close to the geomagnetic equator in the almost same longitude at Kototabang.

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