Copyright:
Stéphane Vetter
(Nuits sacrées);
Music: Eric Aron
原文:
Why do some auroras pulsate? No one is sure. Although this unusual behavior has been known for a long time, the cause remains an active topic of research. Featured here is a dramatic video that captured some impressive pulsating auroras in mid-March over Sv�nafellsj�kull Glacier in Iceland. The 48-second video shown is not time-lapse. The real-time pulsations are exemplified by sequences where the astrophotographer is visible moving about in the foreground. A close inspection of the enigmatic flickering sky colors reveals that some structures appear to repeat, while others do not. The quick rapidity of the pulsations seen here is somewhat unusual — more common are aurora with pulsations that last several seconds. Recent research shows that pulsations are more common in electron-generated aurora, rather than proton aurora, and that the Earth’s local magnetic field may fluctuate in unison. Astrophysicists: Browse 1,000+ codes in the Astrophysics Source Code Library
中文翻譯:
🌌 為什麼有些極光會脈動？雖然這種不尋常的行為已被觀察許久，但具體原因依然是一個活躍的研究課題。近期在冰島的Svinafellsjokull冰川上拍攝到一段驚艷的視頻，展示了壯觀的脈動極光。這段 48 秒的視頻並不是時間延遲影片，實時的脈動用攝影師在前景移動的鏡頭得以彰顯。細心觀察神秘的閃爍天空顏色，可以發現某些結構重複出現，而另一些則不然。這次脈動的速率相對不尋常—較常見的極光脈動持續幾秒鐘。最近的研究表明，電子產生的極光中脈動更為常見，而非質子極光，此外，地球本地的磁場也可能同步波動。
#極光 #脈動極光 #Svinafellsjokull #冰島 #天文學 #科學研究 #自然奇觀 #極光攝影 #astronomy #AuroraBorealis #ScienceInNature #NaturePhotography
來源:NASA每日圖片
