SDO/HMI Continuum Data

The HMI continuum data refers to map of the continuum intensity of the solar spectrum in the region of the Fe I absorption line at 6173 Å 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.

HMI 连续谱数据指的是太阳表面位于 6173 Å 的 Fe I 吸收线区域连续光谱强度的图谱。HMI 在 6173.3 Å 处对 Fe I 吸收线进行六点采样。在假定“纯净”的太阳 Fe I 线轮廓为高斯分布，以及 HMI 滤光器的滤光传输轮廓为 δ 函数的前提下，可计算 Fe I 线的第一和第二傅里叶系数，并据此估算多普勒速度。通过重建太阳线，利用多普勒移位 λo、线宽 σ 和线深 Id 的估算值，得到连续光谱强度 Ic 的估计（代理）。更详细的信息可参考 http://jsoc.stanford.edu/relevant_papers/observables.pdf。

搜集汇总

背景与挑战

背景概述

SDO/HMI Continuum Data数据集记录了太阳连续谱强度，时间跨度为2010年至2026年，采集间隔为45秒。该数据集包含丰富的元数据，如观测时间、仪器状态、数据质量等，适用于太阳物理研究和空间天气分析。