A new component of hard X-rays in solar flares

Details A new component of hard X-rays in solar flares A new component of hard X-rays in solar flares

Dec 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...251l.109l&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 251, Dec. 15, 1981, p. L109-L114.

Other

160

Solar Flares, Solar X-Rays, X Ray Spectra, Balloon-Borne Instruments, Electron Distribution, High Resolution, Solar Activity Effects, Spectral Resolution

Scientific paper

High-resolution (approximately 1 keV FWHM) spectral measurements from 13 to 300 keV of a solar flare hard X-ray burst observed on 1980 June 27 by a balloon-borne array of cooled germanium planar detectors are presented. At energies below about 35 keV, a new component of solar flare hard X-rays is identified. This component is characterized by an extremely steep spectrum which fits closely to that from a Maxwellian electron distribution with a maximum temperature of about 34 x 10 to the 6th K and an emission measure of 2.9 x 10 to the 48th per cu cm. This hot isothermal component appears at the peak of the normal power-law-like impulsive X-ray burst component, and it remains isothermal and dominates the X-ray emission below about 30 keV through the decay of the flare event.

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