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

Frontiers in Astronomy and Space Sciences

Astronomy and Space Sciences

Vanessa Polito¹  Sijie Yu²  Jessie Duncan³  Paola Testa⁴  Katharine K. Reeves⁴  Xudong Sun⁵  Lindsay Glesener⁶  Marianne Peterson⁶ 

[1] Bay Area Environmental Research Institute, NASA Research Park, Moffett Field, CA, United States;Department of Physics, Oregon State University, Corvallis, OR, United States;Center for Solar-Terrestrial Research, New Jersey Institute of Technology, Newark, NJ, United States;Goddard Space Flight Center, Greenbelt, MD, United States;Harvard-Smithsonian Center for Astrophysics, Cambridge, MA, United States;Institute for Astronomy, University of Hawaii at Manoa, Honolulu, HI, United States;School of Physics and Astronomy, University of Minnesota—Twin Cities, Minneapolis, MN, United States;

关键词: solar flare;    solar atmosphere;    UV spectroscopy;    hard X-ray;    hydrodynamic simulations;   

DOI  :  10.3389/fspas.2023.1214901

 received in 2023-04-30, accepted in 2023-07-21,  发布年份 2023

来源: Frontiers

【 摘 要 】

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.

【 授权许可】

Unknown   
Copyright © 2023 Polito, Peterson, Glesener, Testa, Yu, Reeves, Sun and Duncan.