Journal articles
Sunward-propagating Whistler Waves Collocated with Localized Magnetic Field Holes in the Solar Wind: Parker Solar Probe Observations at 35.7 R ⊙ Radii
O.V. Agapitov
1
Thierry Dudok de Wit
2
F. S. Mozer
1
J.W. Bonnell
1
J.F. Drake
3
D. Malaspina
4
V.V. Krasnoselskikh
1
S. Bale
1
P. Whittlesey
1
A. W. Case
5
C. Chaston
1
C. Froment
2
K. Goetzen
6
K. A. Goodrich
1
P.R Harvey
1
J. C. Kasper
Kelly E. Korreck
D. E. Larson
R. Livi
R. J. Macdowall
M. Pulupa
Claire Revillet
M. Stevens
J.R Wygant
O.V. Agapitov 1
Author
Thierry Dudok de Wit 2
Author IdHAL : thierry-dudok-de-wit ORCID : https://orcid.org/0000-0002-4401-0943
F. S. Mozer 1
Author
J.W. Bonnell 1
Author
1
University of California [Berkeley] (Berkeley, CA - United States)
- University of California (United States)
2
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)
3
University of Maryland [Baltimore] ( Baltimore, MD 21201 - United States)
4
University of Colorado [Boulder] (Boulder, Colorado 80309 - United States)
5
CfA - Harvard-Smithsonian Center for Astrophysics (60 Garden Street, Cambridge, MA 02138, USA - United States)
- Harvard University [Cambridge] (Massachusetts Hall, Cambridge, MA 02138 - United States)
- Smithsonian Institution (PO Box 37012, Washington, DC 20013-7012 - United States)
6
University of Minnesota System (United States)
Abstract : Observations by the Parker Solar Probe mission of the solar wind at similar to 35.7 solar radii reveal the existence of whistler wave packets with frequencies below 0.1 f(ce) (20-80 Hz in the spacecraft frame). These waves often coincide with local minima of the magnetic field magnitude or with sudden deflections of the magnetic field that are called switchbacks. Their sunward propagation leads to a significant Doppler frequency downshift from 200-300 to 20-80 Hz (from 0.2 to 0.5 f(ce)). The polarization of these waves varies from quasi-parallel to significantly oblique with wave normal angles that are close to the resonance cone. Their peak amplitude can be as large as 2-4 nT. Such values represent approximately 10% of the background magnetic field, which is considerably more than what is observed at 1 au. Recent numerical studies show that such waves may potentially play a key role in breaking the heat flux and scattering the Strahl population of suprathermal electrons into a halo population.
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Contributor : Nathalie Pothier <>
Submitted on : Monday, April 6, 2020 - 5:40:27 PM
Last modification on : Saturday, February 27, 2021 - 4:02:03 PM
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Identifiers
- HAL Id : insu-02517676, version 1
- ARXIV : 2002.09837
- DOI : 10.3847/2041-8213/ab799c
Citation
O.V. Agapitov, Thierry Dudok de Wit, F. S. Mozer, J.W. Bonnell, J.F. Drake, et al.. Sunward-propagating Whistler Waves Collocated with Localized Magnetic Field Holes in the Solar Wind: Parker Solar Probe Observations at 35.7 R ⊙ Radii. The Astrophysical journal letters, Bristol : IOP Publishing, 2020, 891 (1), pp.L20. ⟨10.3847/2041-8213/ab799c⟩. ⟨insu-02517676⟩
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