Adiabatic and nonadiabatic processes in thermal models of solar hard X-ray bursts

Details Adiabatic and nonadiabatic processes in thermal models of solar hard X-ray bursts Adiabatic and nonadiabatic processes in thermal models of solar hard X-ray bursts

Mar 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...244..653e&link_type=abstract

Astrophysical Journal, Part 1, vol. 244, Mar. 1, 1981, p. 653-658.

Astronomy and Astrophysics

Astrophysics

14

Bremsstrahlung, Convective Heat Transfer, Coronal Loops, Plasma Heating, Solar Flares, Solar Magnetic Field, Solar X-Rays, Adiabatic Conditions, Astronomical Models, Collisionless Plasmas, High Temperature Plasmas, Magnetic Field Configurations, Plasma Cooling, Solar Simulation, Thermal Simulation, Toroidal Plasmas

Scientific paper

The temporal evolution of thermal-bremsstrahlung-emitting material at the top of a solar coronal loop under various processes is examined as a model of solar hard X-ray bursts. The behavior of emission measure and temperature with time is analyzed for the hot plasma confined in a segment at the top of a loop, taking into account the effects or the time variation of the confining toroidal magnetic field, the longitudinal expansion of the source through the motion of a pair of collisionless conduction fronts and unspecified heating or cooling processes. Analytic expressions for the behavior of the toroidal magnetic field and the heating rate necessary to reproduce a given behavior of emission measure and temperature with time are obtained in terms of the initial magnetic field strength and density of the heated region and a characteristic longitudinal expansion time. Results are applied to observations of two impulsive solar hard X-ray bursts, and it is shown that the contribution of heating is negligible after the first few seconds of the events, although significant nonadiabatic heating occurs early in the events.

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