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Connecting Solar Wind Velocity Spikes Measured by Solar Orbiter and Coronal Brightenings Observed by SDO

Authors :
Chuanpeng Hou
Alexis P. Rouillard
Jiansen He
Bahaeddine Gannouni
Victor Réville
Philippe Louarn
Andrey Fedorov
Lubomír Přech
Christopher J. Owen
Daniel Verscharen
Raffaella D’Amicis
Luca Sorriso-Valvo
Naïs Fargette
Jesse Coburn
Vincent Génot
Jim M. Raines
Roberto Bruno
Stefano Livi
Benoit Lavraud
Nicolas André
Gabriel Fruit
Rungployphan Kieokaew
Illya Plotnikov
Emmanuel Penou
Alain Barthe
Dhiren Kataria
Matthieu Berthomier
Frederic Allegrini
Vito Fortunato
Gennaro Mele
Timothy Horbury
Source :
The Astrophysical Journal Letters, Vol 968, Iss 2, p L28 (2024)
Publication Year :
2024
Publisher :
IOP Publishing, 2024.

Abstract

The Parker Solar Probe's discovery that magnetic switchbacks and velocity spikes in the young solar wind are abundant has prompted intensive research into their origin(s) and formation mechanism(s) in the solar atmosphere. Recent studies, based on in situ measurements and numerical simulations, argue that velocity spikes are produced through interchange magnetic reconnection. Our work studies the relationship between interplanetary velocity spikes and coronal brightenings induced by changes in the photospheric magnetic field. Our analysis focuses on the characteristic periodicities of velocity spikes detected by the Proton Alpha Sensor on the Solar Orbiter during its fifth perihelion pass. Throughout the time period analyzed here, we estimate their origin along the boundary of a coronal hole. Around the boundary region, we identify periodic variations in coronal brightening activity observed by the Atmospheric Imaging Assembly onboard the Solar Dynamics Observatory. The spectral characteristics of the time series of in situ velocity spikes, remote coronal brightenings, and remote photospheric magnetic flux exhibit correspondence in their periodicities. Therefore, we suggest that the localized small-scale magnetic flux within coronal holes fuels a magnetic reconnection process that can be observed as slight brightness augmentations and outward fluctuations or jets. These dynamic elements may act as mediators, bonding magnetic reconnection with the genesis of velocity spikes and magnetic switchbacks.

Details

Language :
English
ISSN :
20418213 and 20418205
Volume :
968
Issue :
2
Database :
Directory of Open Access Journals
Journal :
The Astrophysical Journal Letters
Publication Type :
Academic Journal
Accession number :
edsdoj.7a836c2f50414a569db6b8ee8759f7ee
Document Type :
article
Full Text :
https://doi.org/10.3847/2041-8213/ad4eda