Differential photometry of magnetic faculae

Details Differential photometry of magnetic faculae Differential photometry of magnetic faculae

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...296..739f&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 296, Sept. 15, 1985, p. 739-745.

Physics

Optics

20

Faculae, Near Infrared Radiation, Photosphere, Solar Magnetic Field, Stellar Spectrophotometry, Atmospheric Optics, Atmospheric Temperature, Fraunhofer Lines, Optical Thickness, Solar Atmosphere, Stellar Models

Scientific paper

Previous photometric observations carried out at the KPNO vacuum telescope showed that faculae become clearly visible near disk center in the difference of two widely separated (green and red) continuum passbands. The authors present new observations extending this technique to the near-infrared, to demonstrate that the main factor determining the facular visibility is the difference in H- opacity between the continuum passbands. It is shown that the difference signal is directly sensitive to changes in the temperature gradient near τ0.5 = 1 between quiet photosphere and faculae. The measured facular temperature gradient is compared with that given by empirical facular models based on Fraunhofer line observations, and with theoretical predictions.

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