Soft X-ray observations of high-velocity features in the 29 June 1980 flares

Details Soft X-ray observations of high-velocity features in the 29 June 1980 flares Soft X-ray observations of high-velocity features in the 29 June 1980 flares

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...154..255b&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 154, no. 1-2, Jan. 1986, p. 255-262.

Astronomy and Astrophysics

Astronomy

12

Emission Spectra, H Alpha Line, Solar Flares, Solar X-Rays, Spaceborne Astronomy, Stellar Spectrophotometry, Abundance, Calcium, Doppler Effect, Iron, Resonance Lines, Solar Maximum Mission, Solar Wind

Scientific paper

During the impulsive phase of two flares on 29 June 1980, short lived emission line features have been observed in soft X-rays, near the resonance lines of Fe XXV and Ca XIX, by the Bent Crystal Spectrometer on the Solar Maximum Mission. They are coincident with hard X-ray bursts and with the onset of Hα sprays. They appear to result from a different type of phenomenon from the unresolved blue-shifted component from the resonance lines reported by Feldman et al. (1980) and Antonucci et al. (1982). The authors believe that these discrete line features are due to Doppler-shifted resonance line emission from well collimated, moving plasma with large line-of-sight velocities.

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