Large-scale jets in the magnetosheath and plasma penetration across the magnetopause: THEMIS observations

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题名:	Large-scale jets in the magnetosheath and plasma penetration across the magnetopause: THEMIS observations
作者:	狄米奇;Dmitriev, A. V.;Suvorova, A. V.
贡献者:	地球科學學院太空科學與工程學系
关键词:	Fluctuations;Flux;Flux density;Geomagnetic field;Geomagnetism;Geophysics;Jet interaction;Jets;Larmor radius;Magnetic fields;Magnetism;Magnetopause;Magnetosheath;Magnetospheres;Penetration;Plasma;Plasma jets;Plasma physics;plasma transport into the magnetosphere;Solar wind
日期:	2015-06-01
上传时间:	2026-04-23 11:04:40 (UTC+8)
出版者:	Wiley-Blackwell;Washington: Blackwell Publishing Ltd
摘要:	摘要： Time History of Events and Macroscale Interactions during Substorms multipoint observation of the plasma and magnetic fields, conducted simultaneously in the dayside magnetosheath and magnetosphere, were used to collect 646 large‐scale magnetosheath plasma jets interacting with the magnetopause. The jets were identified as dense and fast streams of the magnetosheath plasma whose energy density is higher than that of the upstream solar wind. The jet interaction with the magnetopause was revealed from sudden inward motion of the magnetopause and an enhancement in the geomagnetic field. The penetration was determined as appearance of the magnetosheath plasma against the background of the hot magnetospheric particle population. We found that almost 60% of the jets penetrated through the magnetopause. Vast majority of the penetrating jets was characterized by high velocities V > 220 km/s and kinetic βk > 1 that corresponded to a combination of finite Larmor radius effect with a mechanism of impulsive penetration. The average plasma flux in the penetrating jets was found to be 1.5 times larger than the average plasma flux of the solar wind. The average rate of jet‐related penetration of the magnetosheath plasma into the dayside magnetosphere was estimated to be ~1029 particles/d. The rate varies highly with time and can achieve values of 1.5 × 1029 particles/h that is comparable with estimates of the total amount of plasma entering the dayside magnetosphere. Key Points Approximately 60% of magnetosheath plasma jets penetrate through the dayside magnetopause The average penetrating plasma flux is higher than that of the solar wind The rate of penetration across the magnetopause can achieve 1.5 × 1029 h−1 其他題名： J. Geophys. Res. Space Physics 出版者： Washington: Blackwell Publishing Ltd 出版日期： 2015-06 出處： Journal of geophysical research : Space physics (2013 - Present), 2015-06, Vol.120 (6), p.4423-4437 資源來源： Wiley Online Journals ** 版權： 2015. American Geophysical Union. All Rights Reserved. 版權： Copyright Blackwell Publishing Ltd. Jun 2015 識別號： ISSN: 2169-9380 識別號： EISSN: 2169-9402 識別號： DOI: 10.1002/2014JA020953
显示于类别:	[太空科學與工程學系] 期刊論文

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