Physics
Scientific paper
Nov 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974soph...39...49s&link_type=abstract
Solar Physics, vol. 39, Nov. 1974, p. 49-77.
Physics
141
Atmospheric Models, Chromosphere, Faculae, Line Spectra, Solar Spectra, Astronomical Models, Calcium, Electron Density Profiles, Emission Spectra, Filtergrams, K Lines, Solar Atmosphere, Spectroheliographs
Scientific paper
Chromospheric models of plages are proposed to explain profiles of the Ca II H, K, 8498-A, 8542-A, and 8662-A lines. These models are consistent with boundary conditions imposed by the photosphere and the Lyman continuum. It is found that increasing emission in these lines is consistent with a picture of increasing temperature gradient in the low chromosphere and the resulting increase in pressure and electron density at similar line optical depths. With this picture it is shown how the distribution of chromospheric parameters across the solar disk can be empirically determined directly from Ca II filtergrams. It is also proposed that the high-density aspects of solar activity are produced by steep temperature gradients in the low chromosphere and thus by the enhanced heating mechanisms that steepen these gradients.
Linsky Jeffrey L.
Shine Richard A.
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