フライバイの手がかりを探る(Searching for clues in a fly-by)

ad

2024-04-16 マックス・プランク研究所

宇宙探査機「ベピ・コロンボ」は、2021年8月10日に金星を2度通過し、科学的に進化した機器を搭載し、未踏査領域を飛行。飛行訪問は宇宙での実験条件下で機器をテストし、貴重な科学的知見を提供。MPPEの研究者は最適な条件を期待せず、金星の環境を調査。金星は自らの磁場を生成せず、太陽風によって弱い磁場が誘導される。BepiColomboの機器は高い分解能を提供し、金星の大気化学に関する新たな洞察が得られる可能性がある。

<関連情報>

BepiColomboによる金星の誘導磁気圏の側面における冷たい酸素と炭素イオンの観測 BepiColombo observations of cold oxygen and carbon ions in the flank of the induced magnetosphere of Venus

L. Z. Hadid,D. Delcourt,Y. Saito,M. Fränz,S. Yokota,B. Fiethe,C. Verdeil,B. Katra,F. Leblanc,H. Fischer,M. Persson,S. Aizawa,N. André,Y. Harada,A. Fedorov,D. Fontaine,N. Krupp,H. Michalik,J-J. Berthelier,H. Krüger,G. Murakami,S. Matsuda,D. Heyner,H.-U. Auster,… D. Fischer
Nature Astronomy  Published:12 April 2024
DOI:https://doi.org/10.1038/s41550-024-02247-2

フライバイの手がかりを探る(Searching for clues in a fly-by)

Abstract

On 10 August 2021, the Mercury-bound BepiColombo spacecraft performed its second fly-by of Venus and provided a short-lived observation of its induced magnetosphere. Here we report results recorded by the Mass Spectrum Analyzer on board Mio, which reveal the presence of cold O+ and C+ with an average total flux of ~4 ± 1 × 104 cm−2 s−1 at a distance of about six planetary radii in a region that has never been explored before. The ratio of escaping C+ to O+ is at most 0.31 ± 0.2, implying that, in addition to atomic O+ ions, CO group ions or water group ions may be a source of the observed O+. Simultaneous magnetometer observations suggest that these planetary ions were in the magnetosheath flank in the vicinity of the magnetic pileup boundary downstream. These results have important implications regarding the evolution of Venus’s atmosphere and, in particular, the evolution of water on the surface of the planet.

1701物理及び化学
ad
ad
Follow
ad
タイトルとURLをコピーしました