Spatial and temporal variations in the solar brightness |
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Authors: | Woodard MF Libbrecht KG |
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Institution: | (1) New Jersey Institute of Technology and Big Bear Solar Observatory, 40386 N Shore Lane, Big Bear City, CA , 92314, U.S.A;(2) California Institute of Technology and Big Bear Solar Observatory, 264-33, Caltech, Pasadena, CA , 91125, U.S.A |
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Abstract: | We have investigated long-term variations of solar brightness as a function of both time and solar latitude using eight years
of ground-based photometric data in conjunction with space-based irradiance data. In particular, we have examined whether
the combination of sunspot brightness deficits and facular brightness excesses is sufficient to explain the solar cycle irradiance
variations. After correcting for the contribution from sunspots, we find that the irradiance data can be adequately explained
by a model in which the remaining brightness variations are due entirely to facular contributions confined to the magnetically
active latitudes. Thus we find no support for the hypothesis that there are convectively driven hot bands in the active latitudes,
and our data show brightness variations that are well described by a facular contrast function. |
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