2023年太阳近日点
(原标题: Perihelion Sun 2023)
2023-01-14
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2023年地球最接近太阳的近日点是1月4日16:17 UTC。这是在澳大利亚悉尼用望远镜和h - α滤镜记录下这张清晰的太阳圆盘图像后不到24小时。一个h - α滤光片透射氢原子特有的红光。在观察太阳时，它强调太阳的色球层，即太阳光球层或通常可见的太阳表面之上的区域。在这张越来越活跃的太阳行星大小的H-alpha图像中，太阳黑子区域主要是被称为斑的明亮斑点。当看到太阳边缘时，黑暗的等离子体细丝蜿蜒穿过太阳圆盘，转变成明亮的日珥。
查看原文解释
Perihelion for 2023, Earth's closest approach to the Sun, was on January 4 at 16:17 UTC. That was less than 24 hours after this sharp image of the Sun's disk was recorded with telescope and H-alpha filter from Sydney, Australia, planet Earth. An H-alpha filter transmits a characteristic red light from hydrogen atoms. In views of the Sun it emphasizes the Sun's chromosphere, a region just above the solar photosphere or normally visible solar surface. In this H-alpha image of the increasingly active Sun planet-sized sunspot regions are dominated by bright splotches called plages. Dark filaments of plasma snaking across the solar disk transition to bright prominences when seen above the solar limb.
© Barden Ridge Observatory