F-コロナ減少とK-コロナ微細構造の近日観測
R A Howard1, A Vourlidas2, V Bothmer3
1US Naval Research Laboratory, Washington, DC, USA. Russ.Howard@nrl.navy.mil.
Nature
|December 6, 2019
まとめ
新しいパーカー・ソーラー・プローブの観測は,太陽の近くの塵のないゾーンと,磁気流のロープや島を含む小さな太陽噴火の詳細なプラズマ構造を明らかにしています. これは太陽のコロナ動態と進化の洞察を与えてくれます
科学分野:
- 太陽物理学
- プラズマ物理学
- 宇宙科学
背景:
- 太陽のコロナ (K-コロナとF-コロナ) の遠隔観測は距離によって制限されている.
- 以前の研究では 理論的に予測された太陽の近くの 塵のないゾーンが確認できませんでした
- 構造と小さな太陽のイベントの開始は不確実です.
研究 の 目的:
- パーカー・ソーラー・プローブを使用して,かつてないほど近い距離 (0.16-0.25 AU) で太陽のコロナをイメージする.
- 太陽の近くにある 塵のない領域の 存在を調査するためです
- 小さな太陽噴火の 微細なプラズマ構造を解明するためです
主な方法:
- パーカー・ソーラー・プローブの近日点を通過する時の太陽の冠を画像化している.
- 粉塵の分布を推測するために,短い延長でF-冠の強さを分析する.
- 太陽噴火の微細なプラズマ構造を解明する.
主要な成果:
- 短い延長でF-冠の強度の減少が観察され, 塵のないゾーンを示唆しています.
- 小さな太陽噴火の微細なプラズマ構造を解明し,磁気流のロープと磁気島を特定した.
- 大規模な冠状のトポロジーを確認し,冠状のストリーム内のサブストリームを明らかにしました.
結論:
- パーカー・ソーラー・プローブの観測は 太陽の近くにある 塵のない領域の証拠を提供している.
- この研究は,これまで観測されていなかった 磁気構造を小さな太陽噴火で解明しました
- 冠状のストリームは,連続した密度の変動を持つ小さなサブストリームで構成されています.
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