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ユリセスのラジオとプラズマ波の観測は,南部の高緯度ヘリオグラフィックで実施された
まとめ
ユリセス宇宙船のデータは,太陽周期の相,緯度,太陽距離に関連した電気および磁気波の変動を明らかにしています. 高緯度の観測では,太陽風の変動が少ないため,激しい波の発生が少ないことが示されました.
科学分野:
- 宇宙物理学 宇宙物理学
- プラズマ物理学 プラズマ物理学
- ソーラー物理学 ソーラー物理学
背景:
- ユリセスの宇宙船は,太陽風とその埋め込まれたフィールドと波のインシット測定を提供しました.
- 以前の研究では,太陽風の性質がヘリオグラフィック緯度と太陽周期相によって変化することを示唆していました.
研究 の 目的:
- ユリセス宇宙船からのラジオとプラズマ波の観測を分析するために.
- ヘリオグラフィック緯度,太陽距離,太陽周期相が波の特徴に及ぼす影響を調査する.
主な方法:
- "ユリセス"宇宙船によって収集されたラジオとプラズマ波データを活用した.
- ヘリオグラフィック緯度,太陽距離,太陽周期相による相関波イベントの強さと発生率.
- タイプIIIの電波放射,静電および電磁爆発,磁気穴,磁気雲を含む特定の波現象を調査した.
主要な成果:
- 波の変動は,ヘリオグラフィック緯度,太陽距離,太陽周期相の関数であることが判明しました.
- 高い緯度における太陽のタイプIII放射は,日食線とは異なり,地元のプラズマ周波数には達しませんでした.
- 短時間の波の爆発は,磁界の穴で頻繁に発生し,磁界の雲では広範な波の活動が観測され,おそらく高い電子イオン温度比が原因です.
- 高い緯度では,より少ないインシット波が観測され,これは太陽風の変動率の低下に起因する.
結論:
- ヘリオグラフィの緯度,太陽からの距離,太陽周期の相は,太陽風におけるラジオ波とプラズマ波の活動を著しく調節する.
- 磁気雲内のタイプIIIの放射や活動のような特定の波現象は,位置と太陽の条件によって異なる特徴を示します.
- 高緯度の太陽風の変動性の低下は,これらの地域で激しい波の発生率が低い重要な要因です.
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