Simultaneous quasi-periodic optical and HF radar signatures observed in the postnoon sector

• Murata Yozo

  Department of Polar Science, the Graduate University for Advanced Studies

• Sato Natsuo

  National Institute of Polar Research

• Yamagishi Hisao

  National Institute of Polar Research

• Yukimatu Akira Sessai

  National Institute of Polar Research

• Kikuchi Masayuki

  National Institute of Polar Research

• Makita Kazuo

  Takushoku University

• Ogawa Tadahiko

  Solar-Terrestrial Environment Laboratory, Nagoya University

• Yang Huigen

  Polar Research Institute of China

• Liu Ruiyuan

  Polar Research Institute of China

• Walker A. David M.

  Space Physics Research Institute, University of Natal

抄録

Zhongshan Station in Antarctica is located close to the polar cusp/cleft latitude. The field of view of the Syowa East HF radar also covers Zhongshan Station. Simultaneous quasi-periodic phenomena of optical aurora, HF radar backscatter power and Doppler velocity, and ground based magnetograms were observed in the magnetic postnoon sector (〜330 MLT to 1510 MLT) on 3 August 1997. The characteristics of the quasi-periodic event are summarized in the following; 1) East-west aligned band/arc type discrete aurora showed quasi-periodic luminosity variations with period of -6-10 min, 2) Quasi-periodic variations of the optical aurora had one to one correspondence with the variations of HF radar backscatter powers and magnetic pulsations, 3) The HF backscatter region was located at the lower latitude of the quasi-periodic optical aurora, 4) Quasi-periodic variations of line-of-site Doppler velocity detected by HF radar showed very close relation to the magnetic pulsations observed at Zhongshan in Antarctica and the IMAGE magnetometer array in the northern hemisphere, 5) The IMAGE data revealed that the region of quasi-periodic HF radar backscatter (irregularities) corresponds to the region of intensity maximum of magnetic pulsations.

収録刊行物

• Advances in polar upper atmosphere research

  Advances in polar upper atmosphere research 14 34-44, 2000-08

  国立極地研究所

詳細情報

• CRID: 1570291226876583040
• NII論文ID: 110000037515
• NII書誌ID: AA11397422
• ISSN: 13451065
• 本文言語コード: en
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