High-resolution X-ray spectra of solar flares. VI - Impulsive soft X-ray flares

Details High-resolution X-ray spectra of solar flares. VI - Impulsive soft X-ray flares High-resolution X-ray spectra of solar flares. VI - Impulsive soft X-ray flares

Sep 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...260..885f&link_type=abstract

Astrophysical Journal, Part 1, vol. 260, Sept. 15, 1982, p. 885-893. NASA-supported research.

Astronomy and Astrophysics

Astrophysics

28

High Resolution, Solar Activity Effects, Solar Flares, Solar X-Rays, Spectral Resolution, X Ray Spectra, Electron Emission, Electron Energy, Periodic Variations, Plasma Density, Plasma Temperature, Radiant Cooling, Radiative Transfer, Solar Temperature, Solar Wind

Scientific paper

Doschek et al. (1980) and Feldman et al. (1980) have discussed high-resolution soft X-ray spectra of solar flares. The present investigation is concerned with the characteristics of the impulsive events as observed in soft X rays and the cooling of the flare plasma in terms of energy loss processes. A class of intense, short-lived solar flares which appear to be characterized by very high densities at high temperatures is found. For the 1979 November 6 event, the cooling time is so rapid that the density obtained may be a lower limit. The main cooling mechanism for the flares is found to be radiative. Two of the events are associated with strong gamma-ray emission and both of these events are very unusual in their soft X-ray emission. The 1979 November 9 flare shows extremely broad X-ray emission lines during the rise phase, indicative of nonthermal velocities of the order of 300 km/s.

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