Validation of computed extreme ultraviolet emission spectra during solar flares

Abstract X-rays and extreme ultraviolet (EUV) emissions from solar flares rapidly change the physical composition of Earth’s thermosphere ionosphere, thereby causing space weather phenomena such as communication failures. Numerous empirical models have been developed to estimate effects flare on upper atmosphere. We verified reproduction emission spectra using a one-dimensional hydrodynamic calculation CHIANTI atomic database. To validate proposed model, we used observed EUV obtained by Extreme variability experiment (EVE) board Solar Dynamics Observatory (SDO). examined “EUV time-integrated irradiance” line rise time” for 21 events comparing results model spectral data. The successfully reproduced irradiance Fe VIII 131 Å, XVIII 94 XX133 well 55–355 Å 55–135 bands. For time, there was an acceptable correlation between estimations observations all lines. These demonstrate that can reproduce emitting plasma with relatively high formation temperature. This indicates physics-based is effective accurate irradiance.