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Title:
High-resolution solar flare X-ray spectra
Authors:
Doschek, G. A.; Kreplin, R. W.; Feldman, U.
Affiliation:
AA(U.S. Navy, E. O. Hulburt Center for Space Research, Washington, D.C.), AB(U.S. Navy, E. O. Hulburt Center for Space Research, Washington, D.C.), AC(U.S. Navy, E. O. Hulburt Center for Space Research, Washington, D.C.)
Publication:
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 233, Nov. 1, 1979, p. L157-L160. (ApJL Homepage)
Publication Date:
11/1979
Category:
Solar Physics
Origin:
STI
NASA/STI Keywords:
Plasma Spectra, Solar Flares, Solar X-Rays, X Ray Spectra, High Resolution, Line Spectra, Spectral Resolution, Spectrometers
DOI:
10.1086/183096
Bibliographic Code:
1979ApJ...233L.157D

Abstract

High-spectral-resolution solar flare spectra have been recorded by four Bragg crystal spectrometers flown by the Naval Research Laboratory on a spacecraft. The wavelength ranges are 1.82-1.97 A, 2.98-3.07 A, and 3.14-3.24 A. Electron temperatures ranging between 12 million and 30 million K are derived from dielectronic satellite to resonance-line ratios for an X9 flare that occurred on March 25, 1979. Nonthermal motions varying between about 70 and 160 km/s are derived from line profiles. Equilibrium conditions in the plasma are investigated by using lithium-like satellite lines excited by electron impact excitation. Emission measures of about 5 x 10 to the 50th per cu cm are determined for the times of maximum X-ray flux.

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