Helium like sulphur X-ray emission in solar flares and laboratory plasmas.

Details Helium like sulphur X-ray emission in solar flares and laboratory plasmas. Helium like sulphur X-ray emission in solar flares and laboratory plasmas.

Apr 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...308..670h&link_type=abstract

Astronomy and Astrophysics, v.308, p.670-684

Astronomy and Astrophysics

Astrophysics

23

Atomic Data, X-Rays: General, Sun: Flares, X-Rays

Scientific paper

Theoretical X-ray spectra of He-like sulphur (S xv) derived from the General Relativistic Atomic Structure Package, the Dirac R-matrix code and other calculations are compared to laboratory spectra obtained from the Alcator C tokamak and JET, and solar flare spectra obtained from the Yohkoh Bragg Crystal Spectrometer (BCS) and with the SMM Flat Crystal Spectrometer. The spectra depend on electron temperature and electron density for plasma densities greater than 10^14^ cm^-3^. The fits of the derived synthetic spectra to the laboratory spectra at measured density and temperature are in fair agreement. Very good agreement can be achieved with the solar flare spectra, which are in general consistent with the S xv low-density limit, by adjusting temperature. Thus, S xv line spectra can be used to determine the temperatures of relatively weak flares for which diagnostics from higher-temperature ions are unavailable. Using the synthetic spectra, a search for density effects in Yohkoh BCS data at the time of compact flares was made. None was found, so that it can be deduced that for such flares the electron density is less than 10^14^cm^-3^. Density estimates are made from emission measures and image sizes using Yohkoh Soft X-ray Telescope data. Research has been carried out with the results of laboratory spectra which indicate a variation of the I_x_/I_y_ line intensity ratio across the tokamak minor radius. We have studied various flares which occur at different locations across the solar disk to determine if the same effect exists on the Sun.

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