YOHKOH observations of the creation of high-temperature plasma in the flare of 16 December 1991

Details YOHKOH observations of the creation of high-temperature plasma in the flare of 16 December 1991 YOHKOH observations of the creation of high-temperature plasma in the flare of 16 December 1991

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994soph..153..307c&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 153, no. 1-2, p. 307-336

Astronomy and Astrophysics

Astronomy

39

Calcium, Electron Energy, High Temperature Plasmas, Iron, Line Spectra, Radio Astronomy, Solar Flares, Solar Radio Bursts, Solar X-Rays, Sulfur, X Ray Astronomy, X Ray Imagery, X Ray Spectra, Chromosphere, Conductive Heat Transfer, Light Curve, Radio Telescopes, Satellite-Borne Instruments, Solar Maximum Mission, Spectrometers, X Ray Telescopes

Scientific paper

Yohkoh observations of an impulsive solar flare which occurred on 16 December, 1991 are presented. This flare was a GOES M2.7 class event with a simple morphology indicative of a single flaring loop. X-ray images were taken with the Hard X-ray Telescope (HXT) and soft X-ray spectra were obtained with the Bragg Crystal Spectrometer (BCS) on board the satellite. The spectrometer observations were made at high sensitivity from the earliest stages of the flare, are continued throughout the rise and decay phases, and indicate extremely strong blueshifts, which account for the majority of emission in Ca XIX during the initial phase of the flare. The data are compared with observations from other space and ground-based instruments. A balance calculation is performed which indicates that the energy contained in non-thermal electrons is sufficient to explain the high temperature plasma which fills the loop. The cooling of this plasma by thermal conduction is independently verified in a manner which indicates that the loop filling factor is close to 100%. The production of `superhot' plasma in impulsive events is shown to differ in detail from the morphology and mechanisms appropriate for more gradual events.

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