Infrared imaging of faculae at the deepest photospheric layers

Details Infrared imaging of faculae at the deepest photospheric layers Infrared imaging of faculae at the deepest photospheric layers

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...353..712f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 353, April 20, 1990, p. 712-715.

Astronomy and Astrophysics

Astrophysics

33

Faculae, Infrared Imagery, Photosphere, Solar Activity, Solar Limb, Brightness Temperature, Infrared Telescopes, Solar Cycles, Solar Magnetic Field

Scientific paper

The NOAO 58 x 62 InSb array and the National Solar Observatory McMath telescope are used to image the deepest photospheric layers of three active regions at the 1.63-micron opacity minimum. The faculae are darker than the photosphere, with a measured contrast of at least 2 percent at positions on the disk with mu = 0.75-1.0. Near the limb, they are brighter than the photosphere, as in the visible. At mu = 0.5-0.75, they are difficult to detect at 1.63 micron. The observation that faculae and their immediate surroundings exhibit a clear deficit of brightness temperature near disk center at 1.63 micron seems to rule out the hillock model put forward to explain their center-to-limb contrast variation.

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