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Title:
High-resolution X-ray spectra of solar flares. VI - Impulsive soft X-ray flares
Authors:
Feldman, U.; Doschek, G. A.; Kreplin, R. W.
Affiliation:
AA(U.S. Navy, E. O. Hulburt Center for Space Research, Washington, DC), AB(U.S. Navy, E. O. Hulburt Center for Space Research, Washington, DC), AC(U.S. Navy, E. O. Hulburt Center for Space Research, Washington, DC)
Publication:
Astrophysical Journal, Part 1, vol. 260, Sept. 15, 1982, p. 885-893. NASA-supported research. (ApJ Homepage)
Publication Date:
09/1982
Category:
Solar Physics
Origin:
STI
NASA/STI Keywords:
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
DOI:
10.1086/160307
Bibliographic Code:
1982ApJ...260..885F

Abstract

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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