Preliminary results of the multimode FM/CW ionosonde experiment

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概要

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• 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.

• 国立極地研究所の論文

著者

• Nozaki Kenrou

  Okinawa Radio Wave Observatory Radio Research Laboratory

• Kikuchi Takashi

  Radio Research Laboratories

関連論文

• Phase and amplitude of VLF Omega signals observed simultaneously at three stations in Iceland in association with magnetospheric substorms
• A case study of VLF phase and amplitude variation at 12.1 kHz (Aldra) in Iceland
• Simultaneous observation of VLF phase and absorption anomalies at Syowa Station, Antarctica in association with magnetospheric substorms
• VLF Phase Anomalies Associated with Substorm
• A new multimode FM/CW ionosonde
• Preliminary results of the multimode FM/CW ionosonde experiment

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