金星和三层紫外线太阳
(原标题: Venus and the Triply Ultraviolet Sun)
2022-03-06
浏览次数: 18
这是一种非常不寻常的日食。通常情况下，是地球的月亮使太阳黯然失色。然而，在2012年，金星发生了变化。就像月亮的日食一样，金星的相位随着金星与太阳越来越好地对齐而变得越来越薄。最终，排列变得完美，金星的相位降至零。金星的黑斑穿过了我们的母星。从技术上讲，这种情况可以被称为金星日环食，带有一个非常大的火环。这张照片是在掩星期间，由地球轨道太阳动力学观测站用三种颜色的紫外线拍摄的太阳图像，右边的黑暗区域对应于一个日冕洞。几个小时后，当金星继续在轨道上运行时，又出现了轻微的新月期。下一次金星凌日将发生在2117年。
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This was a very unusual type of solar eclipse. Typically, it is the Earth's Moon that eclipses the Sun. In 2012, though, the planet Venus took a turn. Like a solar eclipse by the Moon, the phase of Venus became a continually thinner crescent as Venus became increasingly better aligned with the Sun. Eventually the alignment became perfect and the phase of Venus dropped to zero. The dark spot of Venus crossed our parent star. The situation could technically be labeled a Venusian annular eclipse with an extraordinarily large ring of fire. Pictured here during the occultation, the Sun was imaged in three colors of ultraviolet light by the Earth-orbiting Solar Dynamics Observatory, with the dark region toward the right corresponding to a coronal hole. Hours later, as Venus continued in its orbit, a slight crescent phase appeared again. The next Venusian transit across the Sun will occur in 2117.