Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jphys..49...55m&link_type=abstract
(IAU, ESA, CNRS, et al., Colloquium on UV and X-ray Spectroscopy of Astrophysical and Laboratory Plasmas, 102nd, Beaulieu-sur-Me
Astronomy and Astrophysics
Astrophysics
Line Spectra, Plasma Diagnostics, Solar Activity, X Ray Spectra, Electron Density (Concentration), Plasma Density, Plasma Temperature, Scatha Satellite
Scientific paper
The present application of X-ray line ratio temperature and density diagnostics to solar active region spectra acquired by the P78-1 satellite's 'SOLEX' instrument notes that only about 10 percent of the observed regions exhibited electron densities greater than 3 billion/cu cm, which is the threshold for the measurement of coronal electron densities. The SOLEX data tightly constrain the G-ratio; some of the calculations presented are not in agreement with observations. Measured active-region temperatures are lower than those required for the most efficient production of the line emissions involved in diagnostic ratios, indicating emission-measure distributions to be a decreasing function of temperature above 1.8 MK.
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