Evolution of Flare-Accelerated Electrons Quantified by Spatially Resolved Analysis

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

Non–thermal electrons accelerated in solar flares produce electromagnetic emission in two distinct, highly complementary domains—hard X-rays (HXRs) and microwaves (MWs). This paper reports MW imaging spectroscopy observations from the Expanded Owens Valley Solar Array of an M1.2 flare that occurred on 2017 September 9, from which we deduce evolving coronal parameter maps. We analyze these data jointly with the complementary Reuven Ramaty High-Energy Solar Spectroscopic Imager HXR data to reveal the spatially-resolved evolution of the non-thermal electrons in the flaring volume. We find that the high-energy portion of the non-thermal electron distribution, responsible for the MW emission, displays a much more prominent evolution (in the form of strong spectral hardening) than the low-energy portion, responsible for the HXR emission. We show that the revealed trends are consistent with a single electron population evolving according to a simplified trap-plus-precipitation model with sustained injection/acceleration of non-thermal electrons, which produces a double-powerlaw with steadily increasing break energy.

Original languageEnglish (US)
Article number22
JournalFrontiers in Astronomy and Space Sciences
Volume7
DOIs
StatePublished - May 27 2020

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics

Keywords

  • corona
  • evolution
  • imaging spectroscopy
  • microwave
  • non-thermal electrons
  • numerical modeling
  • solar flares
  • X-ray

Fingerprint

Dive into the research topics of 'Evolution of Flare-Accelerated Electrons Quantified by Spatially Resolved Analysis'. Together they form a unique fingerprint.

Cite this