Physics
Scientific paper
May 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975soph...42..183p&link_type=abstract
Solar Physics, vol. 42, May 1975, p. 183-207.
Physics
64
Line Spectra, Solar Activity, Solar Spectra, Solar X-Rays, X Ray Spectra, Emission Spectra, High Resolution, Plasma Radiation, Rocket-Borne Instruments, Spectrum Analysis
Scientific paper
Absolute intensities and wavelengths for 98 X-ray emission lines between 9 and 22.5 A are reported. The active-region spectra were obtained with three rocket-borne crystal spectrometers. Identifications are proposed for 62 of the lines, and a model of the emitting plasma is constructed from the intensities of the strongest lines. The emission measure of the model peaks at 3 million K with a value of 1.5 times 10 to the forty-seventh power per cu cm and decreases to 10 to the forty-sixth power per cu cm at 5 million K. Effective oscillator and collision strengths are calculated for the other transitions observed. The relative intensities of O VIII and Ne IX give an oxygen:neon abundance ratio of 8:1. The intensities of the satellite lines to helium-like lines are investigated and it is shown that these lines can be used with confidence in constructing active region models.
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