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

Vanessa Polito, Marianne Peterson, Lindsay Glesener, Paola Testa, Sijie Yu, Katharine K. Reeves, Xudong Sun, Jessie Duncan

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


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.

Original languageEnglish (US)
Article number1214901
JournalFrontiers in Astronomy and Space Sciences
StatePublished - 2023

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics


  • UV spectroscopy
  • hard X-ray
  • hydrodynamic simulations
  • solar atmosphere
  • solar flare


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