太阳上蜿蜒的长丝
(原标题: A Long Snaking Filament on the Sun)
2022-09-13
浏览次数: 15
本月早些时候，太阳展示了有记录以来最长的光丝之一。从图像中心周围明亮的弯曲条纹可见，蛇形灯丝的全部范围估计超过太阳半径的一半——超过35万公里长。灯丝是由被太阳磁场高举在空中的热气体组成的，所以从太阳的侧面看，它看起来就像一个凸起的日珥。在太阳的边缘可以同时看到一个不同的、较小的日珥。这张特色图像是假色和倒色的，不仅突出了灯丝，而且突出了太阳的地毯色球层。右上方的亮点实际上是一个与地球大小相当的黑子。太阳细丝通常持续数小时到数天，最终坍塌，将热等离子体送回太阳。但有时，它们会爆炸并将粒子喷射到太阳系中，其中一些会引发地球上的极光。照片中的细丝出现在9月初，并持续稳定了大约一个星期。
查看原文解释
rlier this month, the Sun exhibited one of the longer filaments on record. Visible as the bright curving streak around the image center, the snaking filament's full extent was estimated to be over half of the Sun's radius -- more than 350,000 kilometers long. A filament is composed of hot gas held aloft by the Sun's magnetic field, so that viewed from the side it would appear as a raised prominence. A different, smaller prominence is simultaneously visible at the Sun's edge. The featured image is in false-color and color-inverted to highlight not only the filament but the Sun's carpet chromosphere. The bright dot on the upper right is actually a dark sunspot about the size of the Earth. Solar filaments typically last from hours to days, eventually collapsing to return hot plasma back to the Sun. Sometimes, though, they explode and expel particles into the Solar System, some of which trigger auroras on Earth. The pictured filament appeared in early September and continued to hold steady for about a week.
© Alan Friedman (Averted Imagination)