Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...232..297c&link_type=abstract
Astrophysical Journal, Part 1, vol. 232, Aug. 15, 1979, p. 297-303. Research supported by the Consiglio Nazionale delle Ricerch
Astronomy and Astrophysics
Astrophysics
20
Continuous Radiation, Faculae, Photosphere, Astronomical Maps, Contrast, Mapping, Radiative Transfer, Solar Radiation, Stellar Models
Scientific paper
Maps reproducing the intensity contrast in the continuum (wavelength of 5000 A) are obtained for a facular point at different positions on the solar disk, and the contribution function of the emergent intensity is analyzed for several representative lines of sight. A two-component axially symmetric model is used whose thermodynamic structure is derived from that of a magnetostatic flux tube representative of a small filigree element. The wall of the flux tube appears to have a dominant role, with respect to the interior, in determining the observable contrast: Hence the reliability of the semiempirical models obtained by inversion of continuum data is seriously questioned. The center-to-limb variation of the average contrast does not vary with the shape of the flux tube (a cylinder and a funnel are considered), the only difference being that the map at mu equals 1.0 for the funnel shows a thin very bright ring. The two-component approximation, neglecting the precise structure of the wall, causes an overestimate of the contrast; a discussion of this effect is given.
Caccin Bruno
Severino Giuseppe
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