Thermal and Nonthermal Energicatiosn in Solar Flares: Soft X-ray Spectroscopic and Hard X-ray Observations

Details Thermal and Nonthermal Energicatiosn in Solar Flares: Soft X-ray Spectroscopic and Hard X-ray Observations Thermal and Nonthermal Energicatiosn in Solar Flares: Soft X-ray Spectroscopic and Hard X-ray Observations

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994kofu.symp..213c&link_type=abstract

In: Proceedings of Kofu Symposium, Kofu, Japan, Sept. 6-10, 1993, p.213-216.

Physics

2

Scientific paper

We have analyzed, using a moment method, the Ca XIX and Fe XXV spectra for 64 flares observed from BCS/Yohkoh together with simultaneous observations in hard X-ray to determine the physical relationship between the thermal and nonthermal energization processes. The results show that preflare heating, which produces the observed pre-impulsive blue-shifts in the Ca XIX and Fe XXV lines, is needed for the nonthermal acceleration of electrons during the impulsive phase.

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