Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975soph...43..117r&link_type=abstract
Solar Physics, vol. 43, July 1975, p. 117-128.
Astronomy and Astrophysics
Astronomy
Far Ultraviolet Radiation, Solar Activity, Solar Corona, Solar Spectra, Spectroheliographs, Oso-6, Satellite Observation, Solar Limb, Solar Temperature, Spaceborne Astronomy
Scientific paper
A sequence of extreme-ultraviolet (EUV) spectroheliograms of McMath region No. 10283 were obtained by OSO-6. The lines O VI (1032 A) Mg X (625 A), Si XII (499 A), and Fe XVI (335 A) were used to determine coronal temperatures and densities above the active region. A comparison of theoretical and observed line ratios yielded coronal temperatures of 2.2 to 2.3 million K above the active region and 2.0 to 2.1 million K in the surrounding area. The temperatures derived from ratios involving the O VI intensities are systematically higher than the others. This is attributed to an error in the theoretical O VI intensities. The intensities observed above the limb are compared with intensities predicted by a simple model based on cylindrical geometry. The overall agreement shows that the assumption of an isothermal corona in hydrostatic equilibrium above the active region is a resonable working hypothesis and that the adopted geometrical model for the electron density distribution is adequate.
Raghavan Nirupama
Withbroe George L.
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