Helium-like sulfur emission in solar flares and laboratory plasmas.
Abstract
Theoretical X-ray spectra of S XV derived from the General Relativistic 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 1014cm-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.
- Publication:
-
UV and X-ray Spectroscopy of Astrophysical and Laboratory Plasmas
- Pub Date:
- 1996
- Bibcode:
- 1996uxsa.conf..417H
- Keywords:
-
- Solar Flares: X-Ray Spectra;
- Plasma: X-Ray Spectra