由LYRA观测到的太阳辐射--一种测试太阳辐照度模型的敏感工具
Eclipses observed by LYRA - a sensitive tool to test the models for the solar irradiance
摘要：
我们分析了最近的日食光变曲线测量的赫茨伯格通道（200-220 nm）的大产量辐射计（LYRA）机载PROBA-2。测量使我们能够准确地检索太阳亮度的中心到边缘变化（CLV）。辐射的形成高度取决于观测角度，因此CLV的检查提供了有关太阳大气中广泛高度的信息。我们采用一维NLTE太阳辐照度辐射转移编码（COSI）来模拟测量的光变曲线和相应的CLV依赖性。该模型被用来测试和约束现有的太阳大气的一维模型，例如光球的温度结构和在赫兹伯格连续谱范围内的伪连续谱不透明度的处理。我们表明，COSI不仅可以准确地再现整个太阳盘面的辐照度，而且还测量CLV。因此，它可以被用来作为一个可靠的工具，模拟光谱太阳辐照度的变化。
英文摘要：
We analyze the light curves of the recent solar eclipses measured by the Herzberg channel (200-220 nm) of the Large Yield RAdiometer (LYRA) onboard PROBA-2. The measurements allow us to accurately retrieve the center- to-limb variations (CLV) of the solar brightness. The formation height of the radiation depends on the observing angle so the examination of the CLV provide information about a broad range of heights in the solar atmosphere. We employ the 1D NLTE radiative transfer COde for Solar Irradiance (COSI) to model the measured light curves and corresponding CLV dependencies. The modeling is used to test and constrain the existing 1D models of the solar atmosphere, e.g. the temperature structure of the photosphere and the treatment of the pseudo- continuum opacities in the Herzberg continuum range. We show that COSI can accurately reproduce not only the irradiance from the entire solar disk, but also the measured CLV. It hence can be used as a reliable tool for modeling the variability of the spectral solar irradiance.
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