Two classes of gamma-ray/proton flares - Impulsive and gradual

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Gamma Rays, Radiant Flux Density, Solar Activity Effects, Solar Flares, Solar Protons, Interplanetary Medium, Power Spectra, Solar Corona, Universal Time

Scientific paper

Various observational properties of gamma-ray/proton (GR/P) flares are investigated. The question whether gamma ray line (GRL) flares are different from other flares is reevaluated, and flares with gradual hard X-ray time profiles are searched for and shown to share many common characteristics. Among the gradual flares, the only difference between those with observable nuclear gamma rays and those without is that hard X-ray burst spectrometer peak rates are greater than 4500 counts/s for the former, and less for the latter. It is proposed that GR/P flares be classified into impulsive and gradual flares. The differences between the two classes ofo GR/P flares are studied in phenomena occurring in the high corona and interplanetary medium. By examining the ratio of the number of interplanetary protons to the number of gamma-ray producing protons, it is found that it is small for impulsive GR/P flares but relatively large for gradual GR/P flares.

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