Soft X-ray line broadening in solar flares

Details Soft X-ray line broadening in solar flares Soft X-ray line broadening in solar flares

Sep 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...236l...9a&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 236, no. 1, Sept. 1990, p. L9-L12. Research supported by SERC.

Astronomy and Astrophysics

Astrophysics

7

Resonance Lines, Solar Flares, Solar X-Rays, Solar Limb, Spatial Resolution, Spectral Line Width, Turbulent Flow

Scientific paper

Recent observations by Fludra et al. (1989) have provided some evidence for the existence of turbulent motions in solar flares. The analysis of these observations shows that there is an excess broadening in the resonance line of Ca XIX at all times in disk and limb flares, and that even in the decay phase the excess line width is nonnegligible, having a roughly constant value of the order 40-80 km/sec. This paper proposes an alternative interpretation of this excess broadening and suggests the possible use of spatially resolved observations of line widths to determine the behavior of the so-called chromospheric evaporation component in solar limb events.

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