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Interplanetary Magnetic Field B-y Controls the Magnetopause Location
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SYSNO ASEP 0573095 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Interplanetary Magnetic Field B-y Controls the Magnetopause Location Author(s) Nafchi, M. A. (CZ)
Němec, F. (CZ)
Pi, G. (CZ)
Němeček, Z. (CZ)
Šafránková, J. (CZ)
Grygorov, K. (CZ)
Šimůnek, Jiří (UFA-U) RID, ORCIDNumber of authors 7 Article number e2023JA031303 Source Title Journal of Geophysical Research-Space Physics. - : Wiley - ISSN 2169-9380
Roč. 128, č. 5 (2023)Number of pages 8 s. Language eng - English Country US - United States Keywords magnetopause ; empirical model ; interplanetary magnetic field ; imf Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) Method of publishing Open access Institutional support UFA-U - RVO:68378289 UT WOS 001000426400001 EID SCOPUS 85160418602 DOI 10.1029/2023JA031303 Annotation We present a statistical study of interplanetary magnetic field (IMF) effects on the magnetopause location based on nearly 15,000 magnetopause crossings identified in the THEMIS A-E, Magion 4, Geotail, and Interball-1 satellite data. In order to exclude the dominant controlling role of the solar wind dynamic pressure, differences between observed and empirical model magnetopause distances are analyzed. We find that the magnetopause distance is significantly controlled by the IMF clock angle, not considered in the used empirical models. Furthermore, during very low Alfven Mach numbers (M-A < 4), IMF B-y component can induce a considerable dawn-dusk asymmetry of the magnetopause shape. The magnetopause distance is found to be larger in the direction of the IMF vector, that is, not only the magnitude but also the orientation of the IMF B-y component is eventually important. The obtained results are qualitatively consistent with a magnetohydrodynamic model run at the Community Coordinated Modeling Center. Workplace Institute of Atmospheric Physics Contact Kateřina Adamovičová, adamovicova@ufa.cas.cz, Tel.: 272 016 012 ; Kateřina Potužníková, kaca@ufa.cas.cz, Tel.: 272 016 019 Year of Publishing 2024 Electronic address https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2023JA031303
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