Center to limb variation of the intensity of the photospheric faculae

Details Center to limb variation of the intensity of the photospheric faculae Center to limb variation of the intensity of the photospheric faculae

Sep 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979soph...63..251h&link_type=abstract

Solar Physics, vol. 63, Sept. 1979, p. 251-255.

Physics

5

Brightness, Faculae, Photosphere, Solar Granulation, Balloon-Borne Instruments, Skylab Program, Solar X-Rays, Stellar Models

Scientific paper

Center to limb variation of the excess brightness of photospheric facular granules was observed at 530 nm with a balloon-borne telescope of 10-cm aperture. Facular granules are found to be 9.2% and 16.2% brighter than the adjacent quiet region at cos theta = 0.65 and 0.50 respectively, theta being the angle between the sun's normal and the line of sight. This observation, together with an earlier result (Hirayama, 1978), lead to facular models which are 600 K hotter than the photosphere if the diameter of facular granules is assumed to be 600 km, and 1000 K hotter if 150 km is assumed instead. It was also found that the soft X-ray bright points as observed by Skylab do not correspond spatially to the photospheric facular granules near the polar region.

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