NRLFLARE: A physical model of solar flare irradiance
Abstract
We introduce the NRLFLARE model, a physically-derived model of solar flare irradiance. The model constrains energy release and volume of a flare using soft X-ray observations, with which it drives a series of hydrodynamic simulations to construct a flare arcade. From these simulations, we have synthesized the irradiance from the chromosphere through the corona, from the X-rays through near ultraviolet, at high cadence and spectral resolution. To test the model, we compare to irradiance observations of X-, M-, and C-class flares measured with the Extreme Ultraviolet Variability Experiment (EVE) onboard the Solar Dynamics Observatory (SDO), as well as to the predictions of the empirical FISM2 model. We find good agreement in spectral lines formed at high temperatures (> few x 106 K), but find the model significantly over-estimates intensities of transition region lines (105 K < T < 106 K). Finally, we scale the heating rates and volumes up to extrapolate to flares exceeding X50 in class to predict spectra for such unobserved flare scales.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2021
- Bibcode:
- 2021AGUFMSH43A..07R