Filaprom on the Western Limb
Image Credit & Copyright: Martin Wise
Explanation: 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.
Tomorrow’s picture: light-weekend
影像提供与版权: Martin Wise
说明: 太阳暗条是受到太阳环状磁场的局束，悬浮在太阳活跃表面上方的庞大白炽电浆流。由于它以太阳盘面为衬底，温度又比太阳光球层略低，故看起来较暗。日珥为悬浮在太阳临边上方的相同结构，但以黝黑的太空为背景，故看起来很明亮。条珥则是二者的复合体，是通过日盘前方并伸展到临边之外的磁化电浆流。在这摄于6月22日、使用氢α滤镜记录的太阳特写影像里，活跃区AR3038位于视野的中心附近，而活跃区AR3032位在太阳的西侧临边附近（右方）。由于太阳自转把AR3032带到太阳的可见临边附近，让本来是日盘上方的庞然暗条，部分伸到临边外头成为突起的日珥。AR3032的条珥有多大呢？影像右上角的地球可作为尺标。（solar filament 太阳暗条；solar prominence 日珥；Filaprom 条珥）