Mathematics
Scientific paper
May 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984siva.work...59h&link_type=abstract
In NASA, Washington Solar Irradiance Variations on Active Region Time Scales p 59-72 (SEE N84-27635 17-92)
Mathematics
8
Faculae, Irradiance, Limb Darkening, Periodic Variations, Solar Activity Effects, Solar Maximum Mission, Energy Budgets, Mathematical Models, Nimbus Satellites, Photometry, Solar Flux, Spatial Resolution, Time Series Analysis
Scientific paper
The limb darkening function of faculae is an important factor in estimating facular contributions to solar irradiance variations. The existing photometric data is reviewed and a synthetic limb darkening function for faculae was generated which was compared with the limb darkening functions currently in use for irradiance modeling. The excess facular flux ranges from 0.017 to 0.0349 of the solar photospheric flux for the various representations. The present limitation appears to be the lack of comprehensive photometric data. The representations are especially varied near the limb, where photometry is most difficult. Synoptic data on calcium plage areas is used as a substitute for facular areas in modeling. Based upon the existing data, the present best value for the effect of faculae on the solar constant is given by delta s/s = 3.9 x 10(-8) A plage prime for an active region near disk center, where A plage is the calcium plage area in millionths of a solar hemisphere.
Hirayama Tadashi
Hudson Hugh S.
Okamoto Tohru
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