Precise wideband photometry of photospheric faculae with an emphasis on the disk center

Details Precise wideband photometry of photospheric faculae with an emphasis on the disk center Precise wideband photometry of photospheric faculae with an emphasis on the disk center

Sep 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985soph...99...43h&link_type=abstract

Solar Physics (ISSN 0038-0938), vol. 99, Sept. 1985, p. 43-54.

Physics

31

Astronomical Photometry, Faculae, Photosphere, Brightness, Solar Limb, Solar Temperature, Telescopes

Scientific paper

Full disk images obtained with a rotating one-dimensional diode array whose rotation axis was set at the disk center are the bases of the present observations of the center-to-limb variation of the excess intensity in faculae for 266 active regions, whose effective temperature is noted to be 6.4 K, on average, where the mean longitudinal magnetic field is 65 G (as measured by the 5233-A line). The average excess intensity for 60 active regions near the disk center is found to be 0.0004 of the quiet sun intensity; this very low excess brightness appeared over the entire active region, by contrast with the reported high excess brightness of facular points. This suggests that the background between facular points in the active region is darker than the true quiet photosphere by 1 percent.

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