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影像提供與版權: Stan Richards

Explanation:
A Thursday evening of Dec 14, 2006, stars were not the only lights in Iowa skies. Spectacular northern lights also shone from the heavens, extending across the midwestern USA and other locations not often graced with auroral displays. The wide-ranging auroral activity was triggered as a large solar flare - an energetic cloud of particles blasted outward from the Sun a few days earlier - collided with planet Earth’s magnetosphere. Alerted to conditions ripe for aurora, photographer Stan Richard recorded this apparition over Saylorville Lake, near Des Moines, Iowa, USA. While the colorful rays seem to end just above the water, they are actually at altitudes of 100 kilometers or more.

說明:
2006年12月14日，一個週四晚上，愛荷華洲的天空可不是只有看到星光而已。北極光同時也從天而降，一直延伸過美國中西部以及其他不常見到極光現象的地區。 此廣範圍的極光現象是被大型的閃焰所觸發的 -- 一層充滿能量的塵埃雲層在稍早幾天前就從太陽向外噴出 -- 接著與 地球 的磁層相撞。攝影師Stan Richard已事先留意到此醞釀極光的最佳環境，在靠近美國 愛荷華洲 Des Moines 的 Saylorville 湖上空記下此影像。 雖然這些繽紛的彩光看似恰好降在水面上，但它們其實是在高空100公里或更高的地方。

資料來源: Scientific American
Department of Physics, NCKU