Relationship between hard X-ray and EUV sources in solar flares

Details Relationship between hard X-ray and EUV sources in solar flares Relationship between hard X-ray and EUV sources in solar flares

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...234..669k&link_type=abstract

Astrophysical Journal, Part 1, vol. 234, Dec. 1, 1979, p. 669-682.

Astronomy and Astrophysics

Astronomy

27

Far Ultraviolet Radiation, Solar Flares, Solar X-Rays, X Ray Astronomy, Electron Energy, Emission Spectra, Oso-5, Photons, Solar Electrons, Solar Radio Bursts, Universal Time, X Ray Sources

Scientific paper

The high time resolution hard X-ray (not less than 15 keV) observations of medium and large impulsive solar flares made with the OSO 5 satellite are compared with the simultaneous ground-based observations of 10-1030 A EUV flux made via sudden frequency deviations (SFD) at Boulder. For most flares the agreement between the times of maxima of the impulsive hard X-ray and EUV emissions is found to be consistent with earlier studies (not less than 1 s). The rise and decay times of the EUV emission are larger than the corresponding times for X-rays not less than 30 keV. When OSO 5 hard X-ray measurements are combined with those made by OGO1, OGO 3, OGO 5, and TD 1A satellites, it is found that there is a nearly linear relationship between the energy fluxes of impulsive EUV emission and X-rays not less than 10 keV over a wide range of flare magnitudes. A model involving only a 'partial precipitation' of energetic electrons and consisting of both thick and thin target hard X-ray sources is examined.

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