Solar hard X-ray bursts

Physics

Scientific paper

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Solar Flares, Solar Maximum Mission, Solar Spectra, Solar X-Rays, X Ray Spectra, Coronal Loops, Gamma Ray Bursts, Particle Acceleration, Periodic Variations, Solar Radio Bursts, Ultraviolet Spectra

Scientific paper

The major results from the Solar Maximum Mission (SMM) are presented as they relate to our understanding of the energy release and particle transportation processes that lead to the high-energy X-ray aspects of solar flares. Evidence is reviewed for a 152-158 day periodicity in various aspects of solar activity, including the rate of occurence of hard X-ray and gamma-ray flares. The statistical properties of over 7000 hard X-ray flares detected with the Hard X-Ray Burst Spectrometer are presented, including the spectrum of peak rates and the distribution of the photon number spectrum. A flare classification scheme introduced by Tanaka is used, and characteristics of the different types (types A, B, and C) are noted. A model based on the association of type C flares and coronal mass ejections is presented to explain many of the characteristics of these gradual flares.

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