太阳光球强度的垂直变化
Latitudinal variation of the solar photospheric intensity
摘要：
我们研究了莫纳罗亚太阳天文台（MLSO）的精密太阳光度望远镜（PSPT）的图像，以寻找太阳光球强度的纬度变化。随着太阳活动带的预期增亮，我们发现极纬平均连续谱强度的微弱增强（连续谱强度增强$\sim0.1 - 0.2%$对应于亮温增强$\sim2.5{\rm K}$）。这似乎是热的起源，而不是由于弱磁性元素的极性积累，连续和CaIIK强度分布向更高的值移动，形状几乎没有变化，从他们的中纬度分布。由于增强是低空间频率和非常小的幅度，它是很难分开的系统仪器和处理误差。我们提供了一个彻底的讨论，并得出结论，测量捕获真正的太阳纬度强度变化。
英文摘要：
We have examined images from the Precision Solar Photometric Telescope (PSPT) at the Mauna Loa Solar Observatory (MLSO) in search of latitudinal variation in the solar photospheric intensity. Along with the expected brightening of the solar activity belts, we have found a weak enhancement of the mean continuum intensity at polar latitudes (continuum intensity enhancement $\sim0.1 - 0.2%$ corresponding to a brightness temperature enhancement of $\sim2.5{\rm K}$). This appears to be thermal in origin and not due to a polar accumulation of weak magnetic elements, with both the continuum and CaIIK intensity distributions shifted towards higher values with little change in shape from their mid-latitude distributions. Since the enhancement is of low spatial frequency and of very small amplitude it is difficult to separate from systematic instrumental and processing errors. We provide a thorough discussion of these and conclude that the measurement captures real solar latitudinal intensity variations.
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