A Unified Computational Model for Solar and Stellar Flares

Abstract

We present a unified computational framework which can be used to describe impulsive flares on the Sun and on dMe stars. The models assume that the flare impulsive phase is caused by a beam of charged particles that is accelerated in the corona and propagates downward depositing energy and momentum along the way. This rapidly heats the lower stellar atmosphere causing it to explosively expand and dramatically brighten. Our models consist of flux tubes that extend from the sub-photosphere into the corona. We simulate how flare-accelerated charged particles propagate down one-dimensional flux tubes and heat the stellar atmosphere using the Fokker-Planck kinetic theory. Detailed radiative transfer is included so that model predictions can be directly compared with observations. The flux of flare-accelerated particles drives return currents which additionally heat the stellar atmosphere. These effects are also included in our models. We examine the impact of the flare-accelerated particle beams on model solar and dMe stellar atmospheres and perform parameter studies varying the injected particle energy spectra. We find the atmospheric response is strongly dependent on the accelerated particle cutoff energy and spectral index.

Accepted for publication by the Astrophysical Journal

References in corpus (5)

• Kepler Flares I. Active and Inactive M dwarfs
• A White Light Megaflare on the dM4.5e Star YZ CMi
• Radiative Hydrodynamic Models of Optical and Ultraviolet Emission from M Dwarf Flares
• RHESSI Line and Continuum Observations of Super-hot Flare Plasma
• Measurements and Modeling of Total Solar Irradiance in X-Class Solar Flares

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