太阳舞
(原标题: Sun Dance)
2024-07-28
浏览次数: 16
有时，太阳的表面似乎在跳舞。例如，在2012年年中，美国宇航局的绕太阳轨道运行的太阳动力观测航天器拍摄到一个令人印象深刻的日冕，它似乎像杂技演员一样表演了一个奔跑的俯冲滚动。这场戏剧性的爆炸是在紫外光下拍摄的，时长约为三小时。环状磁场引导着太阳上热等离子体的流动。跳舞的日珥的规模是巨大的——整个地球都可以很容易地放在热气流动的拱门下。一个静止的日珥通常持续一个月左右，并可能以日冕物质抛射（CME）的形式爆发，将热气体喷射到太阳系中。产生日珥的能量机制仍然是一个研究课题。和2012年一样，今年太阳的表面再次非常活跃，呈现出许多细丝和日珥。
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Sometimes, the surface of our Sun seems to dance. In the middle of 2012, for example, NASA's Sun-orbiting Solar Dynamic Observatory spacecraft imaged an impressive prominence that seemed to perform a running dive roll like an acrobatic dancer. The dramatic explosion was captured in ultraviolet light in the featured time-lapse video covering about three hours. A looping magnetic field directed the flow of hot plasma on the Sun. The scale of the dancing prominence is huge -- the entire Earth would easily fit under the flowing arch of hot gas. A quiescent prominence typically lasts about a month and may erupt in a Coronal Mass Ejection (CME), expelling hot gas into the Solar System. The energy mechanism that creates a solar prominence is still a topic of research. Like in 2012, this year the Sun's surface is again quite active and features many filaments and prominences.