Image Details
Caption: Figure B1.
Spectral lines synthesized from RADYN flare atmospheres. Upper panels: Fe II 325.59 nm spectral lines synthesized from a grid of RADYN simulations, normalized to the continuum level. The colors index the temporal progression from 0 to 50 s in the model. Spectral indices (δ) and low-energy cutoffs (Ec) of the considered models are quoted. Lower panels are for the Fe II 329.58 nm spectral line.
© 2026. The Author(s). Published by the American Astronomical Society.