Journal articles
The Enhancement of Proton Stochastic Heating in the Near-Sun Solar Wind
Mihailo Martinović
1, 2
Kristopher Klein
1
Justin Kasper
3
Anthony Case
3
Kelly Korreck
3
Davin Larson
4
Roberto Livi
4
Michael Stevens
3
Phyllis Whittlesey
3
Benjamin Chandran
Ben Alterman
Jia Huang
Christopher Chen
Stuart Bale
4
Marc Pulupa
4
David Malaspina
John Bonnell
4
Peter Harvey
4
Keith Goetz
Thierry Dudok de Wit
5
Robert Macdowall
Mihailo Martinović 1, 2
Author
Kristopher Klein 1
Author
Justin Kasper 3
Author
Anthony Case 3
Author
John Bonnell 4
Author
Peter Harvey 4
Author
Keith Goetz
Author
Thierry Dudok de Wit 5
Author IdHAL : thierry-dudok-de-wit ORCID : https://orcid.org/0000-0002-4401-0943
Robert Macdowall
Author
1
University of Arizona (Tucson AZ 85721 USA - United States)
2
Observatoire de Paris (61 Av de l'Observatoire 75014 PARIS - France)
- PSL - Université Paris sciences et lettres (60 rue Mazarine 75006 Paris - France)
3
Smithsonian Astrophysical Observatory (60 Garden Street, MS 67, Cambridge, MA 02138-1516 - United States)
- Smithsonian Institution (PO Box 37012, Washington, DC 20013-7012 - United States)
4
University of California [Berkeley] (Berkeley, CA - United States)
- University of California (United States)
5
LPC2E - Laboratoire de Physique et Chimie de l'Environnement et de l'Espace (3A, Avenue de la Recherche Scientifique 45071 Orléans cedex 2 - France)
- OSUC - Observatoire des Sciences de l'Univers en région Centre : UMS3116 (Campus Géosciences, 1A rue de la Férollerie, 45071 Orléans - France)
- INSU - CNRS - Institut national des sciences de l'Univers (INSU-CNRS 3 rue Michel-Ange, 75794 Paris Cedex 16 - France)
- Observatoire de Paris (61 Av de l'Observatoire 75014 PARIS - France)
- PSL - Université Paris sciences et lettres (60 rue Mazarine 75006 Paris - France)
- UO - Université d'Orléans (Château de la Source - Avenue du Parc Floral - BP 6749 - 45067 Orléans cedex 2 - France)
- CNRS - Centre National de la Recherche Scientifique : UMS3116 (France)
- CNES - Centre National d’Études Spatiales [Paris] : UMR 7328 (Siège social : 2 place Maurice Quentin, 75039 Paris - France)
Abstract : Stochastic heating (SH) is a nonlinear heating mechanism driven by the violation of magnetic moment invariance due to large-amplitude turbulent fluctuations producing diffusion of ions toward higher kinetic energies in the direction perpendicular to the magnetic field. It is frequently invoked as a mechanism responsible for the heating of ions in the solar wind. Here, we quantify for the first time the proton SH rate Q(perpendicular to) at radial distances from the Sun as close as 0.16 au, using measurements from the first two Parker Solar Probe encounters. Our results for both the amplitude and radial trend of the heating rate, Q(perpendicular to) proportional to r(-2.5), agree with previous results based on the Helios data set at heliocentric distances from 0.3 to 0.9 au. Also in agreement with previous results, Q(perpendicular to) is significantly larger in the fast solar wind than in the slow solar wind. We identify the tendency in fast solar wind for cuts of the core proton velocity distribution transverse to the magnetic field to exhibit a flattop shape. The observed distribution agrees with previous theoretical predictions for fast solar wind where SH is the dominant heating mechanism.
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https://hal-insu.archives-ouvertes.fr/insu-02937640
Contributor : Nathalie Pothier <>
Submitted on : Monday, September 14, 2020 - 11:36:21 AM
Last modification on : Wednesday, September 23, 2020 - 4:36:59 AM
Contributor : Nathalie Pothier <>
Submitted on : Monday, September 14, 2020 - 11:36:21 AM
Last modification on : Wednesday, September 23, 2020 - 4:36:59 AM
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- HAL Id : insu-02937640, version 1
- DOI : 10.3847/1538-4365/ab527f
Citation
Mihailo Martinović, Kristopher Klein, Justin Kasper, Anthony Case, Kelly Korreck, et al.. The Enhancement of Proton Stochastic Heating in the Near-Sun Solar Wind. Astrophysical Journal Supplement, American Astronomical Society, 2020, 246 (2), pp.30. ⟨10.3847/1538-4365/ab527f⟩. ⟨insu-02937640⟩
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