~ 綠色極光 ~ (附圖) - 趣味新聞網

發表日期 2007-09-27T20:49:56+08:00

     蘇必略湖上空

影像版權與提供: Jeff Hapeman

Explanation:
What if your horizon was green? If you've got a camera, take a picture! That was the experience of Jeff Hapeman last week when visiting the Pictured Rocks National Lakeshore in Michigan. On a quiet night toward the northern horizon over Lake Superior was a long lasting diffuse green aurora. The above image was taken in an effort to capture the sense of wonder one gets when watching an auroral display. Auroras are sparked by energetic particles from the Sun impacting the magnetic environment around the Earth. Resultant energetic particles such as electrons and protons rain down near the Earth's poles and impact the air. The impacted air molecules temporarily lose electrons, and when oxygen molecules among them reacquire these electrons, they emit green light. Auroras are known to have many shapes and colors.

說明:
看見碧綠的地平麵嗎？如果你手邊有相機，拍張照片吧！這正是Jeff Hapeman上星期去美國．密西根州的畫石國傢湖畔遊玩時之經驗。在一個寜靜的夜晚，蘇必略湖遠端的地平麵籠罩著一片持久不散的彌漫綠色極光。拍攝上麵這張影像的目的，在於試著捕捉人們看見極光時的驚艷之感。極光是由來自太陽的高能粒子衝撞地球的磁場所觸發的；其結果是高能量的電子和質子在地球的極區附近撞擊大氣，讓被撞擊的空氣分子短暫失去電子，如果是氧分子重新得迴這些電子，就會發齣綠光。極光具有許多不同的形態和顔色。

資料來源: Scientific American
Department of Physics, NCKU


[ 本帖最後由 dumbmotor 於 2008-10-26 15:51 編輯 ]

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