Parker solar probe observations of solar wind energetic proton beams produced by magnetic reconnection in the near‐sun heliospheric current sheet
Author(s)
Type
Journal Article
Abstract
We report observations of reconnection exhausts in the Heliospheric Current Sheet (HCS) during Parker Solar Probe Encounters 08 and 07, at 16 Rs and 20 Rs, respectively. Heliospheric current sheet (HCS) reconnection accelerated protons to almost twice the solar wind speed and increased the proton core energy by a factor of ∼3, due to the Alfvén speed being comparable to the solar wind flow speed at these near-Sun distances. Furthermore, protons were energized to super-thermal energies. During E08, energized protons were found to have leaked out of the exhaust along separatrix field lines, appearing as field-aligned energetic proton beams in a broad region outside the HCS. Concurrent dropouts of strahl electrons, indicating disconnection from the Sun, provide further evidence for the HCS being the source of the beams. Around the HCS in E07, there were also proton beams but without electron strahl dropouts, indicating that their origin was not the local HCS reconnection exhaust.
Date Issued
2022-05-16
Date Acceptance
2022-03-30
Citation
Geophysical Research Letters, 2022, 49 (9)
ISSN
0094-8276
Publisher
American Geophysical Union (AGU)
Journal / Book Title
Geophysical Research Letters
Volume
49
Issue
9
Copyright Statement
© 2022. The Authors.
This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.
This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made.
Sponsor
Science and Technology Facilities Council (STFC)
Identifier
https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2021GL096986
Grant Number
ST/N000692/1
Subjects
Science & Technology
Physical Sciences
Geosciences, Multidisciplinary
Geology
magnetic reconnection
particle acceleration
solar wind
parker solar probe
heliospheric current sheet
EARTHS MAGNETOPAUSE DEPENDENCE
INFLOW ALFVEN SPEED
X-LINE
SWITCHBACKS
PARTICLES
ELECTRONS
EXHAUSTS
Meteorology & Atmospheric Sciences
Publication Status
Published online
Date Publish Online
2022-05-04