OSO-8 observations of CA II H and K, MG II H and k, L-alpha and L-beta above a sunspot

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Chromosphere, Emission Spectra, Faculae, Line Spectra, Solar Atmosphere, Solar Spectra, Sunspots, Calcium, Electron Density (Concentration), H Lines, K Lines, Lyman Alpha Radiation, Lyman Beta Radiation, Magnesium, Oso-8, Resonance Lines

Scientific paper

The paper reports observations of a sunspot and a nearby plage region by the LPSP instrument of OSO-8. The behaviors of the emission cores of Ca II H and K, and Mg II h and k resonance lines are very similar, and the correspondence in intensity between the four lines persists in all observed features. The Lyman lines, however, show little correlation with the other lines; their emission regions appear broader in the spectroheliograms than the underlying sunspot structure and do not necessarily have a counterpart in lower layers. An electron density of 4.3 x 10 to the 11th per cu cm at 20,000 K is estimated from the central intensity of Lyman-alpha above the umbra.

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