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太陽風によるネオンとアルゴンの同位体分化の制約
Alex Meshik1, Jennifer Mabry, Charles Hohenberg
1Physics Department, Washington University, St. Louis, MO 63130, USA. am@physics.wustl.edu
まとめ
創世記ミッションは,太陽風の同位体組成が,太陽の表面と密接に一致していることを発見しました. これは最小限の分断を示唆し,惑星形成のための均一な太陽星雲をサポートしますが,地球のアルゴンは異なります.
科学分野:
- 惑星科学は惑星科学である.
- ソーラー物理学 ソーラー物理学
- 宇宙化学 (コスモケミストリー)
背景:
- 太陽星雲の同位体組成を理解することは,惑星形成理論にとって極めて重要です.
- ジェネシスミッションは,太陽表面の物質と比較するために太陽風の直接サンプルを採取することを目的とした.
- 太陽風と太陽の間の同位体変動 (分断) は,複雑なプロセスを示す可能性があります.
研究 の 目的:
- 太陽の星雲の同位体組成を評価するために.
- 太陽風のイソトープと太陽表面のイソトープの関係を決定する.
- 太陽風と太陽表面物質の間の同位体変動をチェックするために.
主な方法:
- ジェネシス・ディスカバリーミッションによって帰還された独立した太陽風サンプルを分析した.
- ネオンの同位体 (20Ne/22Ne) とアルゴンの同位体 (36Ar/38Ar) の高精度測定.
- 異なる太陽風システムと地上の大気における同位体比の比較.
主要な成果:
- 20Ne/22Neと36Ar/38Arの比率において,レジーム間の有意な差異は観察されなかった.
- 測定された20Ne/22Neの低速と高速の太陽風の差は0.24 +/- 0.37%でした.
- 測定された36Ar/38Arの低速と高速の太陽風の差は0.11 +/- 0.26%でした.
- 太陽風の36Ar/38Ar比は,地球の大気比より3.42 +/- 0.09%高い.
結論:
- 太陽風の同位体組成は,太陽の表面の同位体組成をよく反映しています.
- これは,太陽風と太陽物質の間の最小の同位素分化の仮説を支持する.
- 観測された36Ar/38Arの差は,地球上の初期の大気損失を示唆する可能性がある.
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