Copyright:
Stanislav Korotkiy
(AstroAlert) &
Mikhail Chubarets;
Music: Pas de Deux (Bird Creek)
原文:
How do sunspots evolve? Large dark sunspots — and the active regions that contain them — may last for weeks, but all during that time they are constantly changing. Such variations were particularly apparent a few weeks ago as the active region AR 2339 came around the limb of the Sun and was tracked for the next 12 days by NASA’s Solar Dynamic Observatory. In the featured time lapse video, some sunspots drift apart, while others merge. All the while, the dark central umbral regions shift internally and their surrounding lighter penumbras shimmer and wave. The surrounding Sun appears to flicker as the carpet of yellow granules come and go on the time scale of hours. In general, sunspots are relatively cool regions where the local magnetic field pokes through the Sun’s surface and inhibits heating. Over the past week, an even more active region — AR 2371 — has been crossing the Sun and releasing powerful flares that have resulted in impressive auroras here on Earth. Follow APOD on: Facebook, Google Plus, or Twitter
中文翻譯:
如何演變的太陽黑子？大型黑暗太陽黑子及其所屬的活躍區域可能會持續幾個星期，但在這段時間內它們不斷變化。幾周前，活躍區域 AR 2339 在太陽邊緣出現，並被美國國家航空航天局（NASA）的太陽動力觀測衛星（Solar Dynamic Observatory）追踪了12天。在這段時間的縮時影片中，有些太陽黑子彼此漂移，另一些則合併。與此同時，黑暗的中央深陰影區域在內部移動，而周邊較亮的半影則閃爍著。周圍的太陽看似在顫動，因為黃色顆粒的出現與消失在幾小時內反覆發生。一般而言，太陽黑子是相對較冷的區域，當地的磁場突出到太陽的表面並抑制加熱。過去一周，另一個更活躍的區域——AR 2371也在太陽上移動，並釋放出強大的耀斑，從而引發了令人印象深刻的極光在地球上出現。
#太陽黑子 #活躍區域 #AR2339 #AR2371 #太陽動力觀測衛星 #耀斑 #極光 #太陽活動 #天文學 #宇宙探索
來源:NASA每日圖片
