Radiative fluxes from the outer atmosphere of a star like the Sun - A construction kit

Details Radiative fluxes from the outer atmosphere of a star like the Sun - A construction kit Radiative fluxes from the outer atmosphere of a star like the Sun - A construction kit

Jan 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...189..163s&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 189, no. 1-2, Jan. 1988, p. 163-172.

Astronomy and Astrophysics

Astrophysics

24

Late Stars, Radiant Flux Density, Solar Flux Density, Stellar Activity, Stellar Atmospheres, Stellar Radiation, Light Curve, Limb Darkening, Magnetic Signatures, Skylab Program, Solar Corona, Solar Limb, Stellar Magnetic Fields, Ultraviolet Radiation, Ultraviolet Spectrometers

Scientific paper

Chromospheric and coronal radiative flux densities of a star like the Sun are simulated as a function of stellar magnetic activity. The required limb-darkening curves for active regions are derived for ultraviolet chromospheric, transition-region and coronal emission lines. The normalized distribution of areas of active regions appears to be nearly independent of the phase in the solar cycle. The synthesis of the emission of the Sun-as-a-star from emissions of active and quiet regions shows that the surface-averaged solar flux densities, averaged over the solar cycle, are compatible with flux-flux relations defined by other late-type dwarfs and giants. Some aspects of rotational modulation are discussed; one result is that chromospheric and coronal flux levels may be out of phase. The simulated flux level of the Sun-as-a-star in different phases of the activity cycle can be made to change along the stellar flux-flux relations (as indicated by observations) by raising the emission from the quiet disk as the number of active regions increases.

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