Observational analysis of Lyα emission in equivalent-magnitude solar flares

Harry J. Greatorex*, Ryan O. Milligan, Phillip C. Chamberlin

*Corresponding author for this work

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Abstract

The chromospheric Lyα line of neutral hydrogen (1216 Å) is the most intense emission line in the solar spectrum, yet until recently observations of flare-related Lyα emission have been scarce. Here, we examine the relationship between nonthermal electrons accelerated during the impulsive phase of three M3 flares that were co-observed by RHESSI, GOES, and the Solar Dynamics Observatory, and the corresponding response of the chromosphere in Lyα. Despite having identical X-ray magnitudes, these flares showed significantly different Lyα responses. The peak Lyα enhancements above the quiescent background for these flares were 1.5%, 3.3%, and 6.4%. However, the predicted Lyα enhancements from FISM2 were consistently
Original languageEnglish
Article number120
Number of pages12
JournalThe Astrophysical Journal
Volume954
Issue number2
Early online date29 Aug 2023
DOIs
Publication statusPublished - 10 Sept 2023

Keywords

  • Solar chromosphere
  • Solar physics
  • Solar x-ray flares
  • Active sun
  • Solar flares
  • Solar extreme ultraviolet emission
  • Spectroscopy

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