2022 Fiscal Year Final Research Report
Investigation of anomalous neutral density enhancement disturbing satellite orbits in the cusp using international sounding rockets
| Project/Area Number |
19K03954
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Multi-year Fund |
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| Section | 一般 |
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| Review Section |
Basic Section 17010:Space and planetary sciences-related
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| Research Institution | Hokkaido Information University |
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Principal Investigator |
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| Project Period (FY) |
2019-04-01 – 2023-03-31
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| Keywords | 宇宙天気 / カスプ / 極域熱圏中性大気密度異常 / 観測ロケット / 宇宙花火 / 共鳴散乱 / 中性大気風 / プラズマドリフト |
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| Outline of Final Research Achievements |
It has been found that a regional enhancement of thermospheric density at 400 km altitude in a polar cusp region. To clarify the cause of the enhancement, it is necessary to measure the neutral atmospheric wind and ion drift there. In this study, we aim to measure them by emitting gases scattering the sun light (barium and strontium) from sounding rockets and reveal the enhancement in the density of the polar thermosphere. Two rocket experiments were conducted under the COVIT-19 pandemic, and one of them was successful. However, because the gas was released outside the target region, the cause of the increase could not be clarified.
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| Free Research Field |
超高層大気物理学
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| Academic Significance and Societal Importance of the Research Achievements |
民間を含め，多くの人工衛星を利用するようになった現在，衛星の軌道や姿勢に影響を与える熱圏の大気密度を正確に予測することは，安全な衛星運用に必要不可欠である．衛星が飛び交う高度に，これまで知られていなかった大気の構造が存在することは，衛星運用にとって大きな影響を与える．成因を明らかにすることで，コンピュータシミュレーションに物理プロセスを組み込むことができ，大気密度の予測を正確にすることで安全な宇宙利用が可能となる．
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