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Understanding how energy is released in flares is one of the central problemsof solar and stellar astrophysics. Observations of high temperature flareplasma hold many potential clues as to the nature of this energy release. It isclear, however, that flares are not composed of a few impulsively heated loops,but are the result of heating on many small-scale threads that are energizedover time, making it difficult to compare observations and numericalsimulations in detail. Several previous studies have shown that it is possibleto reproduce some aspects of the observed emission by considering the flare asa sequence of independently heated loops, but these studies generally focus onsmall-scale features while ignoring the global features of the flare. In thispaper, we develop a multithreaded model that encompasses the time-varyinggeometry and heating rate for a series of successively-heated loops comprisingan arcade. To validate, we compare with spectral observations of five flaresmade with the MinXSS CubeSat as well as light curves measured with GOES/XRS andSDO/AIA. We show that this model can successfully reproduce the light curvesand quasi-periodic pulsations in GOES/XRS, the soft X-ray spectra seen withMinXSS, and the light curves in various AIA passbands. The AIA light curves aremost consistent with long duration heating, but elemental abundances cannot beconstrained with the model. Finally, we show how this model can be used toextrapolate to spectra of extreme events that can predict irradiance across awide wavelength range including unobserved wavelengths.

Simulating Solar Flare Irradiance with Multithreaded Models of Flare Arcades