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太阳绿闪
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http://antwrp.gsfc.nasa.gov/apod ... _parviainen_big.gif
A Green Flash from the Sun
Credit & Copyright: Pekka Parviainen (Polar Image)
Explanation: Many think it is just a myth. Others think it is true but its cause isn't known. Adventurers pride themselves on having seen it. It's a green flash from the Sun. The truth is the green flash does exist and its cause is well understood. Just as the setting Sun disappears completely from view, a last glimmer appears startlingly green. The effect is typically visible only from locations with a low, distant horizon, and lasts just a few seconds. A green flash is also visible for a rising Sun, but takes better timing to spot. A dramatic green flash was caught in the above photograph in 1992 from Finland. The Sun itself does not turn partly green, the effect is caused by layers of the Earth's atmosphere acting like a prism.[/center]
[center]来自太阳的绿色闪光
影像版权与提供: Pekka Parviainen (Polar Image)
说明: 偶而有报导说太阳会发出绿色的闪光,有人认为那只是观测者的错觉而已,另外有一些人认为这是个事实,不过绿色闪光发生的原因还有待解答,只有最具有冒险精神的人,坚持眼见为凭的信念,会想办法亲眼去观看这个现象。 事实上,太阳的确是会发出绿色闪光,而且科学家也完全知道为什么它会发生。 想要观看日盘边缘的绿色闪光,观测地点要有低矮且视野很好的地平面,当落日恰好要完全没入地平面的瞬间,最后一丝的微光,看起来带来令人惊喜的绿色色泽,而且延续的时间有几秒钟,要观看并不是那么难。 另外,在朝阳恰好要冒出地平面的瞬间,也有机会看到这种绿色闪光,只不过时间要抓得很准,观测难度较高。 这张照片中精彩的绿色闪光,是1992年在芬兰拍摄到的。 其实大阳并不是真得变成绿色,这种现象只是地球的大气所产生的效应而已。因为地球的大气很像是三菱镜,会把阳光依它们的颜色展成扇形的七彩色谱,当绿色的光恰好射进我们的眼晴时,在视觉上我们就会看到绿色的闪光。[/center]
[ Last edited by Edelweiss on 2005-12-19 at 04:58 AM ] |
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