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Radial evolution of nonthermal electron populations in the low-latitude solar wind: Helios, Cluster, and Ulysses Observations
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SYSNO ASEP 0331561 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Radial evolution of nonthermal electron populations in the low-latitude solar wind: Helios, Cluster, and Ulysses Observations Title Radiální vývoj netermálních elektronových populací ve slunečním větru v okolí ekliptiky: pozorování z družic Helios, Cluster a Ulysses Author(s) Štverák, Štěpán (UFA-U) RID, ORCID
Maksimovic, M. (FR)
Trávníček, Pavel M. (ASU-R) RID, ORCID
Marsch, E. (DE)
Fazakerley, A. N. (GB)
Scime, E. E. (US)Source Title Journal of Geophysical Research - ISSN 0148-0227
Roč. 114, - (2009), A05104/1-A05104/15Number of pages 15 s. Language eng - English Country US - United States Keywords solar wind ; radial evolution ; non-thermal electron properties Subject RIV BL - Plasma and Gas Discharge Physics CEZ AV0Z30420517 - UFA-U, BC-A (2005-2011) AV0Z10030501 - ASU-R (2005-2011) UT WOS 000265932600001 DOI 10.1029/2008JA013883 Annotation We provide a statistical study of solar wind electron velocity distribution functions (eVDFs) acquired on several spacecraft in low ecliptic latitudes within heliocentric range from 0.3 up to 4 AU. We focus on the non-thermal properties of eVDFs in the slow and fast solar wind regimes. The aim of the present work is to provide an analytical model to fit separately all three components of observed solar wind eVDFs (i.e., the core, the halo, and the strahl) and to study their fractional densities and also the non-Maxwellian character of high-energy eVDF tails. Our results indicates that halo and strahl relative densities vary in an opposite way. The relative number of strahl electrons is decreasing with radial distance while the relative number of halo electrons is increasing. The fractional density of the core population remains roughly constant. These findings confirm that there are mechanisms in the solar wind that scatter strahl electrons into the halo. 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 2010
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