Nonequilibrium Ionization Plasma during a Large Solar Limb Flare Observed by Hinode/EIS

This study on plasma heating considers the time-dependent ionization process during a large solar flare on 2017 September 10, observed by Hinode/EUV Imaging Spectrometer (EIS). The observed Fe xxiv/Fe xxiii ratios increase downstream of the reconnection outflow, and they are consistent with the time-dependent ionization effect at a constant electron temperature T ( e ) = 25 MK. Moreover, this study also shows that the nonthermal velocity, which can be related to the turbulent velocity, reduces significantly along the downstream of the reconnection outflow, even when considering the time-dependent ionization process.

Automated summary

This study investigated the plasma heating process during a solar flare on September 10, 2017 and found that the time-dependent ionization process influences the ionization effect. The study also showed a significant reduction in nonthermal velocity along the downstream of the reconnection outflow, even when considering the time-dependent ionization process.