Solar luminosity fluctuations and active region photometry

Details Solar luminosity fluctuations and active region photometry Solar luminosity fluctuations and active region photometry

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...282l..99c&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 282, July 15, 1984, p. L99-L101.

Astronomy and Astrophysics

Astrophysics

22

Astronomical Photometry, Faculae, Stellar Luminosity, Sunspots, Bolometers, Energy Budgets, Irradiance

Scientific paper

Monochromatic observations, obtained with a 512-element diode array, of the irradiance fluctuations of the sunspots and faculae of an active region during its disk transit in August 1982 are presented. Bolometric and stray light corrections are approximately equal in magnitude but opposite in sign, so they have not been applied. The maximum sunspot fluctuation, as a fraction of the quiet-sun irradiance, is -800 parts per million (ppm). Faculae have a maximum irradiance fluctuation of about +200 ppm near the limbs. It is found that the facular energy excess is more than 50 percent of the sunspot energy deficit, which is -5.8 x 10 to the 35th ergs. These observations show that faculae are an important element in active region energy balance.

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