Okinawa Radio Wave Observatory, Radio Research Laboratory
Radio Research Laboratory
抄録(英)
Bottomside ionospheric observation was made with a microcomputer-controlled FM/CW ionosonde at Syowa Station, Antarctica. This ionosonde provides ionograms for the transmitter frequencies from 2 to 16MHz and also sequential data of virtual height (h') at a fixed frequency with a time resolution of 10s. Since the peak power of the FM/CW ionosonde is 20W, continuous observation was possible without disturbing other radio observations and HF radio communications. The continuous observation at a fixed frequency 2.6MHz shows periodic variations in the virtual height and echo intensity with periods of one to several tens of minutes. Periodic variations with a period of several tens of minutes may indicate a propagation or excitation of internal gravity waves during a geomagnetically quiet period, while a variation with a period of 1min could be caused by an oscillatory precipitation of energetic auroral particles.
雑誌書誌ID
AA10756224
雑誌名
Proceedings of the NIPR Symposium on Upper Atmosphere Physics
Preliminary results of the multimode FM/CW ionosonde experiment
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KJ00000035896
(1.02MB)
概要
