Resonance of Low-frequency Electromagnetic and Ion-sound Modes in the Solar Wind

I. Y. Vasko; F. S. Mozer; T. Bowen; J. Verniero; X. An; A. V. Artemyev; S. D. Bale; J. W. Bonnell; J. Halekas; I. V. Kuzichev

doi:10.3847/2041-8213/ad4ba8

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Resonance of Low-frequency Electromagnetic and Ion-sound Modes in the Solar Wind

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Resonance of Low-frequency Electromagnetic and Ion-sound Modes in the Solar Wind

I. Y. Vasko, F. S. Mozer, T. Bowen, J. Verniero, X. An, A. V. Artemyev, S. D. Bale, J. W. Bonnell, J. Halekas and I. V. Kuzichev

Astrophysical journal. Letters, Vol.967(2), L31

06/01/2024

DOI: 10.3847/2041-8213/ad4ba8

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Abstract

Parker Solar Probe measurements have recently shown that coherent fast magnetosonic and Alfvén ion-cyclotron waves are abundant in the solar wind and can be accompanied by higher-frequency electrostatic fluctuations. In this Letter we reveal the nonlinear process capable of channelling the energy of low-frequency electromagnetic to higher-frequency electrostatic fluctuations observed on board Parker Solar Probe. We present Hall-MHD simulations demonstrating that low-frequency electromagnetic fluctuations can resonate with the ion-sound mode, which results in steepening of plasma density fluctuations, electrostatic spikes, and harmonics in the electric field spectrum. The resonance can occur around the wavenumber determined by the ratio between local sound and Alfvén speeds, but only in the case of oblique propagation to the background magnetic field. The resonance wavenumber, its width, and steepening timescale are estimated, and all indicate that the revealed two-wave resonance can frequently occur in the solar wind. This process can be a potential channel of energy transfer from cyclotron resonant ions producing the electromagnetic fluctuations to Landau resonant ions and electrons absorbing the energy of the higher-frequency electrostatic fluctuations.

Alfvén waves

Solar wind

Space plasmas

Details

Title: Subtitle: Resonance of Low-frequency Electromagnetic and Ion-sound Modes in the Solar Wind
Creators: I. Y. Vasko
F. S. Mozer - University of California, Berkeley
T. Bowen - University of California, Berkeley
J. Verniero - Goddard Space Flight Center
X. An - University of California, Los Angeles
A. V. Artemyev - University of California, Los Angeles
S. D. Bale - University of California, Berkeley
J. W. Bonnell - University of California, Berkeley
J. Halekas - Department of Physics and Astronomy, University of Iowa , Iowa, USA
I. V. Kuzichev - New Jersey Institute of Technology
Resource Type: Journal article
Publication Details: Astrophysical journal. Letters, Vol.967(2), L31
Publisher: IOP Publishing
DOI: 10.3847/2041-8213/ad4ba8
ISSN: 2041-8205
eISSN: 2041-8213
Language: English
Date published: 06/01/2024
Academic Unit: Physics and Astronomy
Record Identifier: 9984634944802771

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