SDO/HMI Linewidth Data
收藏jsoc.stanford.edu2024-11-01 更新2025-03-23 收录
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The linewidth observable refers to the FWHM of the (assumed) Gaussian absorption line profile for the 6173.3 Å line on the surface of the sun.
HMI samples the Fe I absorption line at 6173.3 Å at six points. Assuming that the "pure" solar Fe I line profile is a Gaussian, and the HMI filter filter transmission profiles are delta functions, the first and second Fourier coefficients of the of the Fe I line can be calculated and an estimate of the Doppler Velocity can be made. An estimate (proxy) for the continuum intensity Ic is obtained by "reconstructing" the solar line from the estimates of the Doppler shift λo, the linewidth σ, and the linedepth Id. More details can be found at http://jsoc.stanford.edu/relevant_papers/observables.pdf.
可观测的线宽指的是太阳表面6173.3 Å吸收线的（假设的）高斯吸收线型全宽度半高（FWHM）。
高分辨率成像仪（HMI）在六个位置采样Fe I吸收线于6173.3 Å处。假设“纯净”的太阳Fe I线型为高斯型，并且HMI滤光器的滤光传输曲线为δ函数，则可计算Fe I线的首两个傅里叶系数，并据此估算多普勒速度。
通过对多普勒位移λo、线宽σ和线深度Id的估计“重构”太阳线，获得连续强度Ic的估计（代理值）。更多详细信息请参阅http://jsoc.stanford.edu/relevant_papers/observables.pdf。
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