一个三角形的日珥盘旋在太阳上方
(原标题: A Triangular Prominence Hovers Over the Sun)
2024-09-02
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为什么有一个三角形在太阳上方盘旋？虽然它的形状很不寻常，但它的结构类型却很普通：它是日珥演变的一部分。太阳上的环状磁场引导着高能粒子的流动，有时会使发光的气体结构悬浮数月之久。日珥之所以发光是因为它含有特别热的、密集的或不透明的太阳等离子体。令人惊讶的三角形结构发生在上周。这一标志性的日珥比我们的地球还要大，由几位太阳摄影师拍摄下来，并由美国宇航局的太阳动态天文台记录下来，它在大约一天内形成并剧烈消散。这张特色图像是由氢发出的强烈红光拍摄的。在下方，太阳原纤维覆盖着太阳的色球层，而背景天空相比之下是如此暗淡，以至于看不到任何恒星。我们的太阳表面今年相当活跃。
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Why is there a triangle hovering over the Sun? Although the shape is unusual, the type of structure is not: it is part of an evolving solar prominence. Looping magnetic fields on the Sun channel the flow of energetic particles, sometimes holding glowing gaseous structures aloft for months. A prominence glows brightly because it contains particularly hot, dense, or opaque solar plasma. The surprising triangular structure occurred last week. Larger than our Earth, the iconic prominence was imaged by several solar photographers and documented by NASA's Solar Dynamic Observatory to form and violently dissipate in about a day. The featured image was captured in a color of red light emitted strongly by hydrogen. Below, solar fibrils carpet the Sun's chromosphere, while the background sky is so faint in comparison that no stars are visible. Our Sun's surface has been quite active this year.
© Andrea Vanoni