Multi-wavelength observations and modeling of a microflare: constraining non-thermal particle acceleration

Document Type

Article

Publication Date

1-1-2023

Abstract

In this work we analyze a small B-class flare that occurred on 29 April 2021 and was observed simultaneously by the Interface Region Imaging Spectrograph (IRIS) and the Nuclear Spectroscopic Telescope Array (NuSTAR) X-ray instrument. The IRIS observations of the ribbon of the flare show peculiar spectral characteristics that are typical signatures of energy deposition by non-thermal electrons in the lower atmosphere. The presence of the non-thermal particles is also confirmed directly by fitting the NuSTAR spectral observations. We show that, by combining IRIS and NuSTAR multi-wavelength observations from the corona to the lower atmosphere with hydrodynamic simulations using the RADYN code, we can provide strict constraints on electron-beam heated flare models. This work presents the first NuSTAR, IRIS and RADYN joint analysis of a non-thermal microflare, and presents a self-consistent picture of the flare-accelerated electrons in the corona and the chromospheric response to those electrons.

Identifier

85173939115 (Scopus)

Publication Title

Frontiers in Astronomy and Space Sciences

External Full Text Location

https://doi.org/10.3389/fspas.2023.1214901

e-ISSN

2296987X

Volume

10

Grant

80NSSC21K0135

Fund Ref

National Aeronautics and Space Administration

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