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Whistler Waves As a Signature of Converging Magnetic Holes in Space Plasmas

Jiang, Wence; Verscharen, Daniel; Li, Hui; Wang, Chi; Klein, Kristopher G; (2022) Whistler Waves As a Signature of Converging Magnetic Holes in Space Plasmas. The Astrophysical Journal , 935 (2) , Article 169. 10.3847/1538-4357/ac7ce2. Green open access

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Abstract

Magnetic holes are plasma structures that trap a large number of particles in a magnetic field that is weaker than the field in its surroundings. The unprecedented high time-resolution observations by NASA's Magnetospheric Multi-Scale (MMS) mission enable us to study the particle dynamics in magnetic holes in the Earth's magnetosheath in great detail. We reveal the local generation mechanism of whistler waves by a combination of Landau-resonant and cyclotron-resonant wave-particle interactions of electrons in response to the large-scale evolution of a magnetic hole. As the magnetic hole converges, a pair of counter-streaming electron beams form near the hole's center as a consequence of the combined action of betatron and Fermi effects. The beams trigger the generation of slightly-oblique whistler waves. Our conceptual prediction is supported by a remarkable agreement between our observations and numerical predictions from the Arbitrary Linear Plasma Solver (ALPS). Our study shows that wave-particle interactions are fundamental to the evolution of magnetic holes in space and astrophysical plasmas.

Type: Article
Title: Whistler Waves As a Signature of Converging Magnetic Holes in Space Plasmas
Open access status: An open access version is available from UCL Discovery
DOI: 10.3847/1538-4357/ac7ce2
Publisher version: https://doi.org/10.3847/1538-4357/ac7ce2
Language: English
Additional information: Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence (http://creativecommons.org/licenses/by/4.0/). Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
UCL classification: UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL
URI: https://discovery-pp.ucl.ac.uk/id/eprint/10152165
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