Abstract
view Abstract Citations (22) References (39) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Properties of Solar Coronal Active Regions Deduced from X-Ray Line Spectra McKenzie, D. L. Abstract Spectra from the SOLEX B RAP spectrometer have been used to analyze the temperature and density structure of over 100 nonflaring solar active regions. Density measurements that used the R ratio of O VII indicated that few regions have electron densities higher than ≡3×109cm-3. In a few cases, flare-productive regions had measured densities approximately twice this high. Temperature-sensitive line ratios in the helium-like ions O VII, Ne IX, and Mg XI were used to decude the general properties of the differential emission-measure function B(T) for nonflaring regions. B(T) falls off with increasing temperature above a peak temperature that is almost always lower than Tm(O VII) = 1.8×106K. Publication: The Astrophysical Journal Pub Date: November 1987 DOI: 10.1086/165747 Bibcode: 1987ApJ...322..512M Keywords: Line Spectra; Solar Activity; Solar Corona; Solar X-Rays; X Ray Spectra; Electron Density (Concentration); Emission Spectra; Radiant Flux Density; Solar Temperature; Temperature Dependence; Solar Physics; SUN: CORONA; SUN: X-RAYS; X-RAYS: SPECTRA full text sources ADS |
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