太陽の近くのエネルギー粒子環境の探査
D J McComas1, E R Christian2, C M S Cohen3
1Department of Astrophysical Sciences, Princeton University, Princeton, NJ, USA. dmccomas@princeton.edu.
Nature
|December 6, 2019
まとめ
NASAのパーカー・ソーラー・プローブは 太陽の近くで エネルギーのある粒子を観測し 様々な加速過程を明らかにしました これらの発見は 既存の太陽エネルギー粒子現象モデルに 異議を唱え 宇宙天候の理解を 改善します
科学分野:
- * 太空物理学と宇宙プラズマ物理学
- * 太陽エネルギー粒子 (SEP) の加速と輸送
- * 内部ヘリオスフィアと太陽のコロナ物理学
背景:
- * 太陽エネルギー粒子 (SEP) は"衝動的" (太陽フレア) と"漸進的" (冠状質量放出) 出来事によって加速されます.
- * 過去の観測は,主に1天文単位で,太陽に近い加速物理を遮る輸送効果に直面しました.
- * 粒子の性質の不一致は,2つのプロセスモデルを超えた複雑さを示唆する.
研究 の 目的:
- * パーカー・ソーラー・プローブのデータを用いて,太陽に近いエネルギー粒子放射環境を調査する.
- * 太陽の近くでのSEP加速と輸送メカニズムを直接観察し分析する.
- * 現在のSEP加速モデルにおける曖昧さを解消する.
主な方法:
- * パーカー・ソーラー・プローブによる初期軌道でのエネルギー粒子観測.
- * エネルギースペクトルと組成を含む粒子イベントの特性分析.
- * 粒子イベントと太陽現象の相関 フレアとコロナ質量放出
主要な成果:
- * 衝動的およびCMEに関連するイベントを含む太陽近くの多様なエネルギー粒子イベントの観測.
- * ローカルとリモート加速プロセスの証拠,コロータの相互作用領域を含む.
- SEP加速の単純な2プロセスモデルに挑戦しています.
結論:
- * 太陽に近い環境には様々なSEP加速メカニズムがあります
- * 直接観測は粒子加速と移動の理解における曖昧さを解消する.
- * 発見は,太陽に近い太陽エネルギー粒子を支配する物理学の重要な洞察を提供します.
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