西翼的丝状体
(原标题: Filaprom on the Western Limb)
2022-06-24
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太阳灯丝是一股巨大的白炽等离子体流，通过环状磁场悬浮在太阳的活动表面之上。从太阳盘的角度看，它看起来很暗，只是因为它比太阳光球层稍微冷一点，所以稍微暗一点。悬挂在太阳边缘上的同样的结构在黑暗的太空中看起来很明亮，被称为日珥。丝状体当然是两者兼而有之，一束磁化的等离子体穿过太阳圆盘并延伸到太阳边缘之外。在这张6月22日拍摄的太阳氢α特写照片中，活动区域AR3038位于画面中心附近。活跃区域AR3032位于最右边，靠近太阳的西翼。当AR3032被旋转带向太阳可见的边缘时，它上方曾经是巨大的灯丝，现在部分被看作是日珥，AR3032的灯丝有多大？按比例计算，地球在右上角附近。
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A solar filament is an enormous stream of incandescent plasma suspended above the active surface of the Sun by looping magnetic fields. Seen against the solar disk it looks dark only because it's a little cooler, and so slightly dimmer, than the solar photosphere. Suspended above the solar limb the same structure looks bright when viewed against the blackness of space and is called a solar prominence. A filaprom would be both of course, a stream of magnetized plasma that crosses in front of the solar disk and extends beyond the Sun's edge. In this hydrogen-alpha close-up of the Sun captured on June 22, active region AR3038 is near the center of the frame. Active region AR3032 is seen at the far right, close to the Sun's western limb. As AR3032 is carried by rotation toward the Sun's visible edge, what was once a giant filament above it is now partly seen as a prominence, How big is AR3032's filaprom? For scale planet Earth is shown near the top right corner.
© Martin Wise