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Spectroscopic Measurements of the Ion Velocity Distribution at the Base of the Fast Solar Wind
In situ measurements of the fast solar wind reveal non-thermal distributions of electrons, protons, and minor ions extending from 0.3 au to the heliopause. The physical mechanisms responsible for these non-thermal properties and the location where these properties originate remain open questions. Here, we present spectroscopic evidence, from extreme ultraviolet spectroscopy, that the velocity distribution functions (VDFs) of minor ions are already non-Gaussian at the base of the fast solar wind in a coronal hole, at altit ...
Jeffrey, Natasha; Hahn, Michael; Savin, Daniel; Fletcher, Lyndsay;
Published by: The Astrophysical Journal Published on: 03/2018
YEAR: 2018   DOI: 10.3847/2041-8213/aab08c
Astrophysics - Solar and Stellar Astrophysics; line: profiles; parker solar probe; Solar Probe Plus; Solar wind; Sun: corona; Sun: heliosphere; Sun: UV radiation; techniques: spectroscopic