Comparison of Modeled and Observed Yohkoh BCS Spectra of Some Single Loop Solar Flares

Details Comparison of Modeled and Observed Yohkoh BCS Spectra of Some Single Loop Solar Flares Comparison of Modeled and Observed Yohkoh BCS Spectra of Some Single Loop Solar Flares

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008espm...12.3.51r&link_type=abstract

"12th European Solar Physics Meeting, Freiburg, Germany, held September, 8-12, 2008. Online at http://espm.kis.uni-freiburg.de/,

Physics

Scientific paper

In this work we discuss results of a comparison of the Yohkoh BCS X-ray spectra of the selected solar flares having simple spatial structure and their synthetic spectra calculated using a one-dimensional MHD model of the flaring loop. The models of the flares and their resulting synthetic BSC spectra were calculated using chief parameters (geometry, physical parameters of the plasma, energy spectrum of the non-thermal electrons) estimated for real corresponding events observed on the Sun. For most of the investigated events we obtained quiet good conformability of the synthetic and observed BCS spectra, BCS fluxes as well as GOES X-ray fluxes.
As an example of the obtained results we present and discuss in detail BCS spectra of three solar flares showing both strong and weak stationary components, observed on 16 December 1991, 02 February 1992 and 27 July 2000. For two first events flaring loop's legs lay along the line of sight and both observed and modeled BCS spectra were dominated by the blue-shifted components during the early phase of flares. For the third flare the plane of the loop was very inclined to the line of sight and the stationary component was clearly distinguished and fairly important during the early phase of flare.

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