太阳动态观测卫星记录的日珥爆发
影像来源与版权:NASA/Goddard/SDO AIA Team

说明:日珥爆发是太阳最壮观的景观之一。在2011年,美国航太总署绕行太阳的太阳动态观测卫星(SDO)纪录到一例令人印象深刻,从表面喷出的巨大日珥。在紫外光波段所记录的这个壮观爆发,成为了上面这则涵盖90分钟过程的主题缩时影片,其中每张定格拍摄的间隔为24秒。日珥是受到太阳磁场引导,有时会悬在太阳上空的一种结构。日珥极为庞大,在由流动炽热气体构成的帘状结构之下,可轻易地塞进整颗地球。此外,静止的日珥通常可持续约一个月,最后可能会发生日冕物质抛射,将大量的炽热气体喷入太阳系。不过,日珥形成的能量机制目前仍然是研究的题材。随着太阳越过了活动的极小期,在接下来的数年之中,如日珥爆发这种的太阳活动将变得较常见。
翻译:“每日一天文图”成大物理分站

A Solar Prominence Eruption from SDO
Image Credit & Copyright: NASA/Goddard/SDO AIA Team

Explanation: One of the most spectacular solar sights is an erupting prominence. In 2011, NASA’s Sun-orbiting Solar Dynamic Observatory spacecraft imaged an impressively large prominence erupting from the surface. The dramatic explosion was captured in ultraviolet light in the featured time lapse video covering 90 minutes, where a new frame was taken every 24 seconds. The scale of the prominence is huge — the entire Earth would easily fit under the flowing curtain of hot gas. A solar prominence is channeled and sometimes held above the Sun’s surface by the Sun’s magnetic field. 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. After our Sun passes the current Solar Minimum, solar activity like eruptive prominences are expected to become more common over the next few years.
Astronomy Picture of the Day 05/26/2019