PMID: 19113766Dec 31, 2008Paper

Hot solar-wind helium: direct evidence for local heating by Alfvén-cyclotron dissipation

Physical Review Letters
J C KasperS P Gary

Abstract

A study of solar-wind hydrogen and helium temperature observations collected by the Wind spacecraft offers compelling evidence of heating by an Alfvén-cyclotron dissipation mechanism. Observations are sorted by the rate of Coulomb interactions, or collisional age, in the plasma and the differential flow between the two species. We show that helium is preferentially heated perpendicular to the magnetic field direction by more than a factor of 6 when the flow between the species is small relative to the Alfvén wave speed and collisions are infrequent. These signatures are consistent with predictions of dissipation in the presence of multiple ion species. We also report an unexpected result: observations of efficient heating of helium parallel to the magnetic field for large differential flow relative to the sound speed.

Citations

Oct 2, 2009·Physical Review Letters·K H KiyaniF Sahraoui
Apr 8, 2015·Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences·W H MatthaeusP Dmitruk
Apr 23, 2016·Physical Review Letters·Oreste PezziPierluigi Veltri
Sep 1, 2018·Physical Review Letters·E J ZirnsteinL A Young
Jan 14, 2020·Living Reviews in Solar Physics·Daniel VerscharenBennett A Maruca
Jul 9, 2016·Physical Review Letters·Patrick J TracyThomas H Zurbuchen
Feb 16, 2019·Nature Communications·C H K ChenG G Howes
Nov 9, 2019·Physical Review Letters·P H YoonK G Klein
Jan 15, 2016·Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics·Julia E Stawarz, Annick Pouquet
Jul 22, 2020·The Astrophysical Journal·J Martin LamingBrian E Wood
Feb 4, 2014·Physical Review Letters·B A MarucaM L Stevens
Jul 6, 2014·Physical Review Letters·R E NavarroJ A Valdivia
Mar 19, 2013·Physical Review Letters·Justin C KasperArnaud Zaslavsky
May 17, 2011·Physical Review Letters·L BergerG Gloeckler
Jun 13, 2009·Physical Review Letters·J A AranedaE Marsch
Sep 26, 2012·Physical Review Letters·K T OsmanS C Chapman

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