Electron Acceleration by Interaction of Two Filamentary Currents Within a Magnetopause Magnetic Flux Rope-Reference-Cited by-同舟云学术

Electron Acceleration by Interaction of Two Filamentary Currents Within a Magnetopause Magnetic Flux Rope

Published:2023-06-06 Issue:11 Volume:50 Page:
ISSN:0094-8276
Container-title:Geophysical Research Letters
language:en
Short-container-title:Geophysical Research Letters

Author:

Wang Shimou¹²³^ORCID,Wang Rongsheng¹²³^ORCID,Lu Quanming¹²³^ORCID,Burch J. L.⁴,Cohen Ian J.⁵^ORCID,Jaynes A. N.⁶^ORCID,Ergun R. E.⁷^ORCID

Affiliation:

1. Deep Space Exploration Laboratory School of Earth and Space Sciences University of Science and Technology of China Hefei China

2. CAS Center for Excellence in Comparative Planetology CAS Key Laboratory of Geospace Environment Anhui Mengcheng National Geophysical Observatory University of Science and Technology of China Hefei China

3. Collaborative Innovation Center of Astronautical Science and Technology Harbin China

4. Southwest Research Institute San Antonio TX USA

5. The Johns Hopkins University Applied Physics Laboratory Laurel MD USA

6. Department of Physics and Astronomy University of Iowa Iowa City IA USA

7. Laboratory of Atmospheric and Space Sciences University of Colorado Boulder CO USA

Abstract

AbstractTwo types of filamentary currents (FCs) were observed inside a magnetic flux rope at the magnetopause by the Magnetospheric Multiscale mission. The first FC is identified as an electron vortex, while the other is a reconnecting current sheet. Stochastic electric fields were generated within the FCs, resulting in electron acceleration up to a few keV, similar to recent simulations of electron acceleration inside vortex, which is a second‐order Fermi acceleration. Furthermore, two FCs propagated at different speeds, causing compression in the region between them. Energetic electrons up to 200 keV were detected in the compressed region and displayed a double power‐law spectrum. Observations suggest that the electrons were mainly accelerated by betatron mechanism in the compressed region. The formation, evolution, and interaction of FCs provide a novel mechanism for electron acceleration. These results clearly show the significance of electron‐scale dynamics within flux rope.

Publisher

American Geophysical Union (AGU)

Subject

General Earth and Planetary Sciences,Geophysics

Link

https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/2023GL103203

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