Copyright:
Oliver Hardy
原文:
Yesterday, the Sun exhibited one of the longest filaments ever recorded. It may still be there today. Visible as the dark streak just below the center in the featured image, the enormous filament extended across the face of the Sun a distance even longer than the Sun’s radius — over 700,000 kilometers. A filament is actually hot gas held aloft by the Sun’s magnetic field, so that viewed from the side it would appear as a raised prominence. The featured image shows the filament in light emitted by hydrogen and therefore highlights the Sun’s chromosphere. Sun-following telescopes including NASA’s Solar Dynamics Observatory (SDO) are tracking this unusual feature, with SDO yesterday recording a spiraling magnetic field engulfing it. Since filaments typically last only from hours to days, parts of this one may collapse or erupt at any time, either returning hot plasma back to the Sun or expelling it into the Solar System. Is the filament still there? You can check by clicking on SDO’s current solar image. Follow APOD on: Facebook, Google Plus, or Twitter
中文翻譯:
昨晚，太陽展現了有史以來最長的日冕絲之一。今天它可能還在，於特別照片中可見的黑色絲帶正好在中央下方，這巨大日冕絲延伸超過700,000公里，甚至比太陽半徑還要長。日冕絲其實是被太陽磁場懸浮的熱氣體，因此從側面看會呈現為凸起的日冕。特別照片展示了在氫發射的光下，突顯了太陽的色球層。包括美國國家航空暨太空總署（NASA）的太陽動態觀測衛星（SDO）在內的太陽觀測望遠鏡正追蹤這一異常特徵，SDO在昨天錄得其周圍螺旋狀的磁場。由於日冕絲通常僅持續數小時至數天，這一絲的部分可能隨時崩潰或爆發，無論是將熱等離子體重新返回太陽，還是將其拋入太陽系。這絲現在還在嗎？你可以透過點擊SDO的當前太陽圖像來查看。
#太陽 #日冕絲 #太陽動態觀測 #SDO #天文觀測 #壯觀的宇宙 #宇宙奇觀 #科學探索
來源:NASA每日圖片
