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Author Stakhiv, Mark ♦ Lepri, Susan T. ♦ Landi, Enrico ♦ Tracy, Patrick ♦ Zurbuchen, Thomas H.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword ASTROPHYSICS, COSMOLOGY AND ASTRONOMY ♦ ACCELERATION ♦ ELEMENT ABUNDANCE ♦ HELIOSPHERE ♦ ION TEMPERATURE ♦ PLASMA ♦ POLAR REGIONS ♦ SOLAR CORONA ♦ SOLAR WIND ♦ SPACE VEHICLES ♦ SUN ♦ VELOCITY
Abstract The origin and acceleration of the solar wind are still debated. In this paper, we search for signatures of the source region and acceleration mechanism of the solar wind in the plasma properties measured in situ by the Advanced Composition Explorer spacecraft. Using the elemental abundances as a proxy for the source region and the differential velocity and ion temperature ratios as a proxy for the acceleration mechanism, we are able to identify signatures pointing toward possible source regions and acceleration mechanisms. We find that the fast solar wind in the ecliptic plane is the same as that observed from the polar regions and is consistent with wave acceleration and coronal-hole origin. We also find that the slow wind is composed of two components: one similar to the fast solar wind (with slower velocity) and the other likely originating from closed magnetic loops. Both components of the slow solar wind show signatures of wave acceleration. From these findings, we draw a scenario that envisions two types of wind, with different source regions and release mechanisms, but the same wave acceleration mechanism.
ISSN 0004637X
Educational Use Research
Learning Resource Type Article
Publisher Date 2016-10-01
Publisher Place United States
Journal Astrophysical Journal
Volume Number 829
Issue Number 2


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