Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...244l.141c&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor, vol. 244, Mar. 15, 1981, p. L141-L145. Research supported by the Science
Astronomy and Astrophysics
Astrophysics
66
Solar Flares, Solar Maximum Mission, Solar Spectrometers, Solar X-Rays, X Ray Spectra, Calcium, High Resolution, Iron, K Lines, Light Curve, Proportional Counters, Solar Wind
Scientific paper
Preliminary results obtained for three solar flares with the bent crystal spectrometer on the SMM are presented. Resonance and satellite lines of Ca XIX and XVIII and Fe XXV and XXIV are observed together with the Fe XXVI Lyman-alpha line. Plasma properties are deduced from line ratios and evidence is presented for changes of line widths coincident with the occurrence of a hard X-ray impulsive burst. Fe K-alpha spectra from a disk center and a limb flare agree with the predictions of a fluorescence excitation model. However, a transient Fe K-alpha burst observed in a third flare may be explained by the collisional ionization of cool iron by energetic electrons.
Acton Loren W.
Antonucci Ester
Bentley Robert D.
Catura Richard C.
Culhane Leonard J.
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