AAS 204th Meeting, June 2004
Session 47 When the Sun Went Wild
Topical Session, Tuesday, June 1, 2004, 2:30-4:00pm, 4:15-6:00pm, 702/704/706

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[47.16] Thermal and Non-Thermal Emission in Two-Ribbon Flares

H. Warren (NRL)

The observation that in many flares there is a good correlation between the soft X-ray emission and the time-integrated non-thermal emission --- the Neupert effect --- indicates a strong link between magnetic reconnection and particle acceleration. We present hydrodynamic simulations of flare loops heated by precipitating energetic electrons. Instead of representing a flare as a single loop, we model it as a succession of independently heated, small-scale filaments. We find that to reproduce the observed thermal emission the energy in the injected electrons must be proportional to the soft X-ray flux, not the derivative of the soft X-ray flux as suggested by the Neupert effect. Comparisons between the simulations and GOES and RHESSI observations indicates that there is not sufficient energy in the non-thermal electrons to account for the thermal emission observed in a large, long duration flare. This suggests that there must be in situ heating of coronal plasma as well as particle acceleration during magnetic reconnection.

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