Constraints on the Electron Acceleration Process in Solar Flare: A Case Study

Autor:	Liang Zhao, Linghua Wang, N. Bian, F. Effenberger, Stephen Lesage, Gang Li, X. Wu
Rok vydání:	2021
Předmět:	Physics Particle acceleration Geophysics Electron acceleration Solar energetic particles Solar flare Turbulence Astrophysics::High Energy Astrophysical Phenomena Scientific method Physics::Space Physics General Earth and Planetary Sciences Computational physics
Zdroj:	Geophysical Research Letters
ISSN:	1944-8007 0094-8276
DOI:	10.1029/2021gl095138
Popis:	Combining in situ measurements of energetic electrons and remote sensing observations of hard X-rays and type III radio bursts, we examine the release times of energetic electrons in the July 23, 2016 event. We find that the releases of in situ energetic electrons from the Sun are delayed from those electrons that are responsible for the hard X-rays. We further find that the release time of in situ electrons is a function of electron energy. Under the assumption that the acceleration mechanism for the upward propagating electrons is of Fermi-type and is controlled by an energy-dependent diffusion coefficient, we fit these release times by a simple functional form, related to the turbulence spectral index. Implications of our study on the underlying electron acceleration mechanisms and the magnetic reconnection process in solar flares are discussed. Our results demonstrate the power of the recently developed fractional velocity dispersion analysis (FVDA) method in solar flare studies.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::bd5d7f9b47bc8b0a8bfeaa6a6ed3ee6d https://doi.org/10.1029/2021gl095138 Zobrazit plný text záznamu Plný text