Evolution of the high-temperature plasma in the 15 June 1973 flare

Details Evolution of the high-temperature plasma in the 15 June 1973 flare Evolution of the high-temperature plasma in the 15 June 1973 flare

Dec 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977soph...55..413c&link_type=abstract

Solar Physics, vol. 55, Dec. 1977, p. 413-429.

Physics

16

Far Ultraviolet Radiation, High Temperature Plasmas, Magnetohydrodynamic Stability, Solar Activity Effects, Solar Flares, Spectroheliographs, Magnetic Field Configurations, Plasma Density, Plasma Spectra, Plasma Temperature, Plasma Turbulence, Skylab Program, Spectral Line Width, Temperature Gradients

Scientific paper

The evolution of the high-temperature plasma in the solar flare of June 15, 1973, is analyzed using XUV spectroheliograms obtained from Skylab. Preflare enhancement of loops in the active region is discussed, and the temperature and density of the hot plasma are determined as a function of time. The turbulent velocity in the high-temperature plasma is deduced from a comparison of line widths of the Fe XXIV doublet at 192 and 255 A. The results indicate that: (1) the flare occurred in a low-lying loop or loops; (2) the large-scale magnetic-field configuration of the active region did not change significantly; (3) the hot plasma observed in Fe XXIII-XXIV showed considerable dynamic activity, including an initial upward motion of the whole plasma with a velocity of about 80 km/s; (4) large turbulent mass motions took place in the Fe XXIII-XXIV plasma with random velocities of 100 to 160 km/s; (5) the temperature of the hot plasma was 14 million K at peak X-ray intensity, decreased slightly, and then remained at 12.6 million K before dropping to below 10 million K; and (6) there was a temperature gradient along the length of the loop, with the 14 million-K plasma near the top and progressively lower-temperature plasmas on either side.

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