Microwave and X-ray emission during an isentropic expansion and their application to solar flares

Computer Science

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Isentropic Processes, Microwave Emission, Plasma Radiation, Solar Flares, Solar Radio Emission, Solar X-Rays, Expansion, Plasma Diffusion, Solar Corona, Synchrotron Radiation

Scientific paper

The gyro-synchrotron emission in microwaves and the free-free in X-rays of a plasma enclosed in a cylinder coincident with a magnetic force tube were calculated for an isentropic self-similar expansion, with plane and cylindrical symmetries. This expansion model was applied to a region of the low solar corona, and the results were compared to the emission observed in some simple solar events of low intensity. The calculations show satisfactory coincidence with the events in X-rays for energies around 10 to the 29th power ergs. The solar events analyzed in microwaves, which are not the same that were studied in X-rays, in general do not fit the theoretical results. The origin of the discrepancy is probably the formulation of the processes of emission applied to the expansion.

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