Magnetic field structures of hard X-ray flares observed by HINOTORI spacecraft

Statistics – Computation

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Magnetic Field Configurations, Solar Magnetic Field, Solar X-Rays, X Ray Spectroscopy, Coronal Loops, Plasma Potentials, Solar Corona

Scientific paper

The magnetic field structure of five flares observed by HINOTORI spacecraft is studied. The double source structure of impulsive flares indicates hard X-ray emission from the two footpoints of a flaring loop. The potential field computation, however, does not reproduce a loop connecting the two sources, implying that the magnetic field could be in a highly sheared configuration. Gradual flares are characterized by hard X-ray sources located in the corona, 20,000 to 40,000 km above the photosphere. The potential field modeling is found to give a reasonable fitting in this type of flare, and the hard X-ray sources are located at the top of the magnetic loop or arcade, as is expected in the thick-target trap model of hard X-ray bursts.

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