稲妻によるイオノスフィアの散発的なE層の強化
1Rutherford Appleton Laboratory, Chilton, Oxfordshire OX11 0QX, UK. C.J.Davis@rl.ac.uk
Nature
|June 10, 2005
まとめ
雷雨は,イオノスフィアの散発的なE層を著しく強化する. 嵐のすぐ上に観測されるこの雷による効果は,ラジオ波の伝播を変化させます.
科学分野:
- 大気物理学 大気物理学
- イオノスフィア科学とは
- 電磁気学は,電磁気学である.
背景:
- 雷雨とイオノスフィアの関連性は,1920年代から示唆されてきた.
- 下層イオノスフィアとの雷の相互作用は,モデリングと測定によってサポートされています.
- 雷によるイオノスフィアの散発的なE層の調節は,さらなる統計的検証を必要とします.
研究 の 目的:
- 嵐が中緯度の散発的なE層に与える影響を統計的に分析する.
- 雷が観測されたイオノスフィアの変化の原因であるかどうかを判断する.
- 雷と散発的なE層の強化を結びつける潜在的なメカニズムを調査する.
主な方法:
- 雷の活動に関連したイオノスフィアのデータの統計分析.
- 雷雨に対するイオノスフィアの反応と,雷を伴わない気象システムの比較.
- 散発的なE層の特性 (密度,高さ) と雷の発生との相関.
主要な成果:
- 雷雨の直上にある散発的なE層の統計的に有意な増強と標高減少が特定されました.
- 雷が欠けている低圧システムでは,有意なイオノスフィアの反応は検出されなかった.
- 局所的な散発的なE層の強化は,雷の活動に直接関係しています.
結論:
- 稲妻は,中緯度の散発的なE層を明らかに調節し,局所的な増強と降下を引き起こします.
- 観測されたイオノスフィアの強化は,一般的な天候パターンではなく,雷の直接的な結果です.
- 可能性のあるメカニズムには,垂直に拡散する重力波や電気放電,おそらくその組み合わせが含まれます.
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