Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...281..442f&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 281, June 1, 1984, p. 442-454.
Astronomy and Astrophysics
Astrophysics
45
Astronomical Photometry, Heat Flux, Photosphere, Solar Atmosphere, Solar Granulation, Limb Darkening, Magnetic Flux, Solar Magnetic Field, Sunspots, Thermal Conductivity
Scientific paper
Results of a general survey of photospheric heat flow on scales between granulation and global scale convection are presented. Photometric rasters in the visible continuum show a prominent mottle pattern whose scale and morphology resemble the CaK chromospheric network, but the pattern's correlation with photospheric magnetic fields is too low and its lifetime of 5-10 minutes is too short to support any physical connection to the supergranulation. The network exhibits a slight excess continuum brightness relative to the nonmagnetic photosphere at mu = 1. An upper limit of 2-3 K is placed on nonaxisymmetric brightness inhomogeneities over scales of 50,000-200,000 km. This limit provides a more direct constraint on models of global scale convection than do existing limits on a pole-equator temperature difference. The absence of a thermal shadow preceding an observed spot group seems to favor the higher eddy thermal conductivity profile of Spruit's (1974) model compared to that of Baker and Temesvary (1966).
Foukal Peter
Fowler L.
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