Flare Plasma Dynamics Observed with the YOHKOH Bragg Crystal Spectrometer. I. Properties of the CA XIX Resonance Line

Details Flare Plasma Dynamics Observed with the YOHKOH Bragg Crystal Spectrometer. I. Properties of the CA XIX Resonance Line Flare Plasma Dynamics Observed with the YOHKOH Bragg Crystal Spectrometer. I. Properties of the CA XIX Resonance Line

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...419..418m&link_type=abstract

Astrophysical Journal v.419, p.418

Astronomy and Astrophysics

Astronomy

55

Sun: Flares, Sun: X-Rays, Gamma Rays

Scientific paper

Using data from the Bragg crystal spectrometer on the Yohkoh spacecraft we have computed measures of the total intensity, centroid position, and line width for the resonance line of Ca xix during the rise phase and after maximum for 219 solar flares. The difference between the centroid positions early and late in each flare yields a measure of the line-of-sight velocity shift of the line centroid. We find a trend in the average value of the centroid shift with distance from Sun center suggesting radial mass motions with a characteristic velocity of 58 km s-1. There is a correlation between the rise-phase line widths and the centroid shift. We find no correlation between the centroid shift and the peak intensity, rise time, and total flare duration; and no correlation between the line width and the distance from Sun center, the peak intensity, rise time, and total flare duration. These results do not conclusively support or refute the simple electron-beam-driven model or the thermal model for the rise phase of a solar flare.

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