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A new view on drivers of magnetopause locations
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SYSNO ASEP 0473477 Document Type A - Abstract R&D Document Type The record was not marked in the RIV R&D Document Type Není vybrán druh dokumentu Title A new view on drivers of magnetopause locations Author(s) Němeček, Z. (CZ)
Šafránková, J. (CZ)
Šimůnek, Jiří (UFA-U) RID, ORCID
Shue, J.-H. (TW)
Samsonov, A. A. (RU)Number of authors 5 Source Title 4th Cluster and THEMIS workshop: Book of abstracts. - Paris : European Space Agency (ESA), 2017
S. 22-23Number of pages 2 s. Publication form Online - E Action Cluster-THEMIS Workshop /4./. Event date 07.11.2016 - 12.11.2016 VEvent location Palm Springs Country US - United States Event type WRD Language eng - English Country FR - France Keywords solar wind ; magnetopause ; THEMIS spacecraft Subject RIV BL - Plasma and Gas Discharge Physics Institutional support UFA-U - RVO:68378289 Annotation The solar wind dynamic pressure is the principal factor controlling the
magnetopause location. Their mutual relation is usually considered in a power-law
form and suggested indices vary from -1/4.8 to -1/6.6 in particular magnetopause
models. The paper analyzes about ten thousands of THEMIS dayside magnetopause crossings observed in a broad range of upstream pressures (0.2-20 nPa) and
discusses the relationship between the dynamic pressure and magnetopause standoff
distance and flaring angle. We found that (1) the power-law form provides the
best description of variations of the stand-off distance with upstream pressure for a
full set of crossings as well as for subsets constrained by a sign of the interplanetary
magnetic field (IMF) vertical component, IMF cone angle, and solar wind speed; (2)
the most appropriate value of the power index resulting from the present study is
-1/3.83 if only a dependence on the upstream solar wind pressure is considered;
(3) the power index varies from -1/3.1 to -1/4.2 depending on the IMF direction and
solar wind speed; and (4) the value of the power index increases to or above -1/6 if
the orbital spacecraft limitations are not handled properly.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 2017
Number of the records: 1