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1975年6月の大流星嵐が地球のイオノスフィアに及ぼす影響
Science (New York, N.Y.)
|November 10, 1989
まとめ
1975年の隕石嵐は,これまでに記録された中で最大のもので,地球のイオノスフィアに大きな混乱を引き起こしました. ラジオデータは,VLFのユニークな無線伝播異常を明らかにし,イベント中に実質的なイオン生成を示しました.
科学分野:
- 宇宙物理学 宇宙物理学
- 大気科学 大気科学
- ラジオ科学 ラジオ科学
背景:
- 1975年6月の隕石嵐は,月に設置されたアポロの地震計によって観測された,史上最大の隕石嵐でした.
- これまでの研究は,月面観測に焦点を当て,潜在的な地上の影響を無視していました.
研究 の 目的:
- 1975年6月の隕石嵐からの無線データを再検討する.
- 嵐が地球のイオノスフィアと非常に低い周波数 (VLF) のラジオ伝播に及ぼす影響を調査する.
主な方法:
- 1975年6月の期間の無線データの分析.
- VLFの無線伝播経路における相異常の調査.
- 地上のイオン圏におけるイオン生成率の推定.
主要な成果:
- 隕石嵐は,地球の低いイオノスフィアに顕著な混乱を引き起こし,ユニークなVLF相異常として記録されました.
- 観察された効果には,昼間の相変化の減少,夜間と昼間の相レベルの変化,そして日没相遅延率の変化が含まれています.
- 推定されたイオン生成率は,より短い経路のための太陽ライマンアルファイオン化に匹敵する,有意であった.
結論:
- 1975年の隕石嵐は,地上のイオノスフィアに大きな影響を与えた.
- VLFの無線伝播は,流星嵐の活動とそのイオノスフィアの効果の敏感な指標です.
- 隕石の嵐が地球の大気圏に及ぼす影響に関するさらなる研究が必要である.
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