Spatial and temporal variations in the solar brightness

被引：0
作者：
M.F. Woodard
K.G. Libbrecht
机构：
[1] New Jersey Institute of Technology and Big Bear Solar Observatory,
[2] California Institute of Technology and Big Bear Solar Observatory,undefined
来源：
Solar Physics | 2003年 / 212卷
关键词：
Temporal Variation; Solar Cycle; Brightness Variation; Photometric Data; Contrast Function;
D O I：
暂无
中图分类号：
学科分类号：
摘要：
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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页码：51 / 64
页数：13
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