Impulsive phase soft X-ray blueshifts at a loop footpoint

Details Impulsive phase soft X-ray blueshifts at a loop footpoint Impulsive phase soft X-ray blueshifts at a loop footpoint

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...333l..99z&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 333, Oct. 15, 1988, p. L99-L101. Research supported by the Lockhe

Astronomy and Astrophysics

Astrophysics

7

Chromosphere, Line Shape, Solar Corona, Solar Flares, Solar X-Rays, X Ray Spectroscopy, Coronal Loops, Electron Density (Concentration), Solar Maximum Mission, Spatial Resolution

Scientific paper

Solar Maximum Mission (SMM) observations of a solar flare that occurred on May 24, 1987 are described. The event was noteworthy in that it was observed during the impulsive phase with the SMM X-ray Poly-chromator (XRP) pointed at a location associated with the chromospheric footpoints of a system of coronal loops. Density-sensitive line ratios at the flare site imply an initially large electron density of 5 x 10 to the 12th/cu cm, which decreased an order of magnitude during the flare. Spectral scans of the soft X-ray Mg XI line at the site reveal asymmetric blueshifted (200 km/s) profiles concurrent with impulsive hard X-ray emission. The blueshift amplitude was correlated with the intensity of hard X-rays (with a phase delay of about 30 s) and showed fluctuations on a time scale comparable with the variation of hard X-ray emission. These observations are interpreted as evidence for chromospheric evaporation produced by heating and expansion of footpoint plasma.

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