极光与基特峰国立天文台
On March 28th, 2001, southern latitudes of the United States were treated to a bright and colorful auroral display. This year marks the height of the 11 year solar cycle which can create intense magnetic storms. This particular aurora is probably associated with a coronal mass ejection from an active region known as AR9393 and associated with the sunspot group discussed in this NOAO press release (see also the press release from Sacramento Peak Observatory). Other interesting information about the effects of the Sun on the Earth can be found at the Space Weather web site. It is rare to be able to see an aurora of this magnitude from Arizona. This is a 30 second exposure using Fuji 800 film and a 50mm camera lens. In addition to the red and green colors, also note the faint striations in the aurora. With the unaided eye these "streamers" moved across the sky in slow undulating waves. The aurora persisted for about an hour, and some of the changes can be seen by comparison with this other image from the same roll of film.Minimum credit line: Adam Block/NOAO/AURA/NSF
好图，鼓励多贴！
最好有大图，可以做桌面。 上图还小吗？不过做桌面是太长了。基特峰的照片我有很多，但不是太长就是太宽，都不大适合做桌面。极光的有两张，另一张和上面那张也差不多。 大家如果想看什么图，我会尽力去找的！ @_@天怎么是彩色的：）@_@ 因为有彩色的极光
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