Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apjs...49..293l&link_type=abstract
Astrophysical Journal Supplement Series, vol. 49, June 1982, p. 293-315.
Astronomy and Astrophysics
Astrophysics
62
Chromosphere, Oso-8, Resonance Lines, Sunspots, Atmospheric Heating, Atomic Excitations, Instrument Errors, Photosphere, Radiative Transfer, Solar Magnetic Field, Solar Temperature, Starspots, Stellar Models, Umbras
Scientific paper
OSO 8 spectrometer observations of the H I, Mg II, and Ca II resonance lines of a large quiet sunspot during November 16-17, 1975, along with a C IV line of that event obtained by a ground-based spectrometer, are analyzed together with near-simultaneous ground-based Stokes measurements to yield an umbral chromosphere and transition region model. Features of this model include a chromosphere that is effectively thin in the resonance lines of H I and Mg II, while being saturated in Ca II, and an upper chromospheric structure similar to that of quiet-sun models. The similarity of the upper chromosphere of the sunspot umbra to the quiet-sun chromosphere suggests that the intense magnetic field plays only a passive role in the chromospheric heating mechanism, and the observations cited indicate that solar-type stars with large areas of ordered magnetic flux would not necessarily exhibit extremely active chromosphere.
Lites Bruce W.
Skumanich Andrew
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