Physics
Scientific paper
Jan 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986soph..103...21c&link_type=abstract
Solar Physics (ISSN 0038-0938), vol. 103, Jan. 1986, p. 21-31.
Physics
36
Astronomical Photometry, Faculae, Irradiance, Solar Activity, Solar Flux Density, Sunspots, Brightness Distribution
Scientific paper
The Extreme Limb Photometer (ELP) has been used to measure the irradiance fluctuation of the Sun due to selected active regions. Forty-five active regions that were completely scanned at various disk positions are included in the analysis. The contribution of these active regions to a global solar irradiance fluctuation has been correlated with photometric sunspot and facular indices (PSI and PFI) using published values of sunspot and calcium plage areas. The measured ELP fluctuations are converted to a global brightness fluctuation, ΔB/B. The sunspot component of ΔB/B correlates with PSI with r = 0.95. The facular component of ΔB/B correlates with PFI with r = 0.72. The expression for PFI is important to the question of energy balance between sunspots and faculae and the results presented here are not incompatible with energy balance between the two phenomena; that is the energy deficit of sunspots may be balanced by the energy excess of faculae.
Chapman Gary A.
Meyer David A.
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