High-resolution solar flare X-ray spectra

Details High-resolution solar flare X-ray spectra High-resolution solar flare X-ray spectra

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...233l.157d&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 233, Nov. 1, 1979, p. L157-L160.

Astronomy and Astrophysics

Astrophysics

73

Plasma Spectra, Solar Flares, Solar X-Rays, X Ray Spectra, High Resolution, Line Spectra, Spectral Resolution, Spectrometers

Scientific paper

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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