由散射光补偿后的HMI数据导出的网络和光斑的光度学性质
Photometric Properties of Network and Faculae Derived from HMI Data Compensated for Scattered-Light
摘要：
我们报告的光度学特性的光斑和网络观察到的全磁盘，散射光校正图像的日震磁成像仪。我们使用Lucy-Richardson反卷积程序，在不到一秒的时间内纠正图像。光斑通过接近活跃区域而与网络区分开。这是第一份报告，全磁盘的意见，包括中心到肢体的变化，再现光斑和网络的光度特性，以前只观察到在亚弧秒分辨率，小视场的研究，即网络，定义的距离活动区域，表现出更高的光度对比度。具体地，对于大于大约300 G的磁通量值，网络比光斑更亮，并且对比度差朝向肢体增加，其中网络对比度大约是光斑对比度的两倍。对于较低的磁通量值，网络看起来比光斑暗。与以前的全圆盘观测报告相反，我们还发现网络表现出更高的中心到边缘的变化。我们的研究结果是一致的模拟报告，表明磁通量单独是一个贫穷的代理光度特性的磁性功能。我们估计，光斑和网络的贡献，太阳总辐照度的变化的当前周期24被高估了至少11%，由于网络和光斑的光度特性没有被认为是不同的。该估计值特定于本研究中用于重建辐照度变化的方法，因此在将其扩展到其他技术时应谨慎。
英文摘要：
We report on the photometric properties of faculae and network as observed in full-disk, scattered-light corrected images from the Helioseismic Magnetic Imager. We use a Lucy-Richardson deconvolution routine that corrects an image in less than one second. Faculae are distinguished from network through proximity to active regions. This is the first report that full-disk observations, including center-to-limb variations, reproduce the photometric properties of faculae and network observed previously only in sub-arcsecond resolution, small field-of-view studies, i.e. that network, as defined by distance from active regions, exhibit higher photometric contrasts. Specifically, for magnetic flux values larger than approximately 300 G, the network is brighter than faculae and the contrast differences increases toward the limb, where the network contrast is about twice the facular one. For lower magnetic flux values, network appear darker than faculae. Contrary to reports from previous full-disk observations, we also found that network exhibits a higher center-to-limb variation. Our results are in agreement with reports from simulations that indicate magnetic flux alone is a poor proxy of the photometric properties of magnetic features. We estimate that the contribution of faculae and network to Total Solar Irradiance variability of the current Cycle 24 is overestimated by at least 11\% due to the photometric properties of network and faculae not being recognized as different. This estimate is specific to the method employed in this study to reconstruct irradiance variations, so caution should be paid when extending it to other techniques.
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