コーラス波による電子散乱によるパルスオーロラ
S Kasahara1, Y Miyoshi2, S Yokota3
1Department of Earth and Planetary Science, School of Science, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo, Japan.
Nature
|February 16, 2018
まとめ
科学者たちは 熱い電子が 合唱波を散らばって 脈動するオーロラを 引き起こしていることに気づきました この驚異的な大気中の光を 駆動する鍵となるメカニズムの 直接的な証拠です
科学分野:
- 宇宙物理学
- 大気科学
- プラズマ物理学
背景:
- オーロラ・サブストームは,磁気圏からの太陽風エネルギー放出によって動的な上層大気現象である.
- 脈動するオーロラは エネルギーに満ちた電子が 落下することで生じる 準周期的な瞬きによるものです
- 磁気圏の電子とホイッスルモードの合唱波の相互作用が,この降水の原因であると推測されている.
研究 の 目的:
- コーラス波によるエネルギーの電子散乱の直接的な観測証拠を提供するためです.
- 脈動するオーロラを生成するメカニズムを 確認するために
主な方法:
- 2017年3月に電子センサーと電磁場機器を装備した磁気圏宇宙船を用いた観測.
- 準周期的な電子流の分析
- 地上オーロラ画像装置による同時観測.
主要な成果:
- コーラス波によって散らばった 活発な電子を直接観測した.
- 電子の流れが 脈動するオーロラを生成するほど 濃い
- 地上からのオーロラの観測が確認された
結論:
- この研究は コーラス波と 活発な電子の降水と 脈動するオーロラを 関連付ける最初の直接的な観測証拠を提供します
- この発見は オーロラ現象の原因となる 宇宙物理学の重要なメカニズムを 検証しています
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