Physics
Scientific paper
Nov 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992soph..142...35m&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 142, no. 1, p. 35-46.
Physics
14
Faculae, Photosphere, Sunspots, Astronomical Photometry, Solar Magnetic Field
Scientific paper
The interpretation of dark magnetic faculae observed in previous imaging of the solar photosphere at 1.63 micron is further investigated. It is shown that their contrast at 1.63 micron increases with magnetic flux beyond a threshold value of about 2 x 10 exp 18 Mx and blends smoothly with the contrast vs flux relation measured at this wavelength for larger structures of sunspot size. The contrast of the dark faculae observed near the disk center at 1.63 micron is approximately 4 percent. The present observations at 1.23 micron, which probe slightly higher photospheric levels, do not show these dark faculae. It is inferred that magnetic flux tubes of diameter as small as 500 km significantly inhibit convective heat flow to the photosphere, much as do sunspot flux tubes of much larger diameter. It is suggested that, in even smaller flux tubes, the inhibition becomes readily less significant. It is shown that the sunspot-size dependence of umbral IR contrast vs wavelength that is observed can be explained in terms of instrumental blurring.
Foukal Peter
Moran Thomas
Rabin Doug
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