Simultaneous ground-based and satellite observations of natural VLF waves in Antarctica: A case study of downward ionospheric penetration of whistler-mode waves
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概要
- 論文の詳細を見る
ホイスラモード波の電離層透過特性を詳細に調べるために、2006年南極において地上とあけぼの衛星によるVLF(数百Hz〜17.8 kHz)帯の自然電磁波動の同時観測を行った。この観測において、地上とあけぼの衛星で波動強度の周波数特性がよく似た自然VLF波動のイベントを得た。本研究では、この同時観測結果に基づきfull-wave解析を用いることによって理論的にホイスラモードの下降伝搬を計算している。事例解析として2006年3月15日のコーラスの同時観測イベントに対して、あけぼの衛星で観測された波動伝搬ベクトルは140〜160度に分布した。一方で理論計算では、電離層透過のための波動伝搬ベクトルは155.6度、その角度幅約2度になる必要があるという結果を得た。さらに、電離層透過に対する波動エネルギーの減衰は、観測値の17〜19 dBに一致して理論計算では20.4 dBと推定された。
著者
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Ozaki M.
Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan.
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Yagitani S.
Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan.
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Nagano I.
Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan.
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Kasahara Y.
Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan.
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Yamagishi H.
National Institute of Polar Research, Tachikawa, Tokyo 190-8518, Japan.
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Satom N.
National Institute of Polar Research, Tachikawa, Tokyo 190-8518, Japan.
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Kadokura A.
National Institute of Polar Research, Tachikawa, Tokyo 190-8518, Japan.
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Satom N.
National Institute Of Polar Research Tachikawa Tokyo 190-8518 Japan.
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Yagitani S.
Kanazawa University Kakuma-machi Kanazawa 920-1192 Japan.
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Kasahara Y.
Kanazawa University Kakuma-machi Kanazawa 920-1192 Japan.
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Nagano I
Kanazawa University Kakuma-machi Kanazawa 920-1192 Japan.
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Yagitani S.
Kanazawa University
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Kadokura A.
National Institute Of Polar Research Tachikawa Tokyo 190-8518 Japan.
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Kadokura A.
National Institute Of Polar Research
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Nagano I.
Kanazawa University Kakuma-machi Kanazawa 920-1192 Japan.
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Yamagishi H.
National Institute Of Polar Research Tachikawa Tokyo 190-8518 Japan.
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Yamagishi H.
National Institute Of Polar Research
関連論文
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