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Solar Wind Proton Deceleration in Front of the Terrestrial Bow Shock
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SYSNO ASEP 0509742 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Solar Wind Proton Deceleration in Front of the Terrestrial Bow Shock Author(s) Urbář, Jaroslav (UFA-U) RID, ORCID
Němeček, Z. (CZ)
Šafránková, J. (CZ)
Přech, L. (CZ)Number of authors 4 Source Title Journal of Geophysical Research-Space Physics. - : Wiley - ISSN 2169-9380
Roč. 124, č. 8 (2019), s. 6553-6565Number of pages 13 s. Publication form Print - P Language eng - English Country US - United States Keywords bow shock ; foreshock ; solar wind Subject RIV BL - Plasma and Gas Discharge Physics OECD category Fluids and plasma physics (including surface physics) R&D Projects GA17-06065S GA ČR - Czech Science Foundation (CSF) Method of publishing Limited access Institutional support UFA-U - RVO:68378289 UT WOS 000490956600011 EID SCOPUS 85070514066 DOI 10.1029/2019JA026734 Annotation The terrestrial foreshock as a region permeated by different types of plasma waves, various particle populations, and strong wave activity is a subject of intensive investigations. Our statistical study of the solar wind proton velocity deceleration in the foreshock uses multipoint observations of the THEMIS mission and compare them with the Wind solar wind monitor with a motivation to estimate the factors influencing evolution/modification of the solar wind speed. In order to follow changes of the solar wind proton speed, our moment calculations do not include the reflected particles as well as heavier ions. We have found a systematic deceleration of the solar wind protons with a decreasing distance to the bow shock that is correlated with the flux of reflected and accelerated particles, with the level of magnetic field fluctuations in the ultralow frequency range, and with their compressibility. We can conclude that the reflected particles excite waves of large amplitudes and, as a consequence, modify median values of the velocity measured in an unperturbed solar wind. The deceleration is as high as 3% in front of the quasi‐parallel bow shock and decreases with the distance being observable up to 50 RE. We found similar effects in front of the Moon and attributed them to an influence of the solar wind ions reflected from the lunar surface. 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 2020 Electronic address https://agupubs.onlinelibrary.wiley.com/doi/abs/10.1029/2019JA026734
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