Observations of the CA XIX resonance line during the impulsive phase of solar flares

Details Observations of the CA XIX resonance line during the impulsive phase of solar flares Observations of the CA XIX resonance line during the impulsive phase of solar flares

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989soph..123..161m&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 123, no. 1, 1989, p. 161-176.

Physics

22

Calcium, Coronal Loops, Resonance Fluorescence, Solar Flares, Solar X-Rays, Ablation, Chromosphere, Computerized Simulation, Doppler Effect

Scientific paper

Numerical simulations of flaring coronal loops, based on the assumption of an electron beam energy input, show that material is ablated from the chromosphere at approximately the local sound speed, thus giving rise to an overall blueshift in the spectrum of the soft X-ray Ca XIX resonance line of up to 5 mA. The observational evidence for the existence of this blueshift is critically examined. From an exhaustive analysis of seven limb flares and nine disk flares, no indication appears of Ca XIX blueshifts in excess of about 1 mA. This conclusion may present serious problems for the electron beam hypothesis: possible reasons for the apparent discrepancy between theory and observations are discussed.

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