APOD090728：花一般美的北极光
本帖最后由 gohomeman1 于 2009-7-28 16:39 编辑今天的APOD是北极光。极光图也算常见了，不过如此美丽的就不太常见了。
http://apod.nasa.gov/apod/ap090728.html
A Floral Aurora Corona
http://apod.nasa.gov/apod/image/0907/auroracorona_kenwell.jpg
Credit & Copyright: Zoltan Kenwell(Infocus Imagery)
Explanation:
Few auroras show this level of detail.Above, a standard digital camera captured a particularly active and colorfulauroral corona that occurred last week above Alberta, Canada.With a shape reminiscent of a flower, thespectacular aurora had an unusually high degree ofdetail.The vivid green and purpleauroral colors are caused by high atmosphericoxygen andhydrogenreacting to a burst of incomingelectrons.Many photogenic auroras have been triggered from asolar windstream that recently passed the Earth.The auroras were unexpected because the initiating Sun has beenunusually quiet of late. 今天的北京天文馆翻译比较快，就用他们的了，大图也用了他们的。
http://www.bjp.org.cn/apod/today.htm
花一样的极光冕
http://www.bjp.org.cn/files/2009-07/28/F_6e91251e955c42b894ab79ddefd68b67_auroracorona_kenwell_big.jpg
影像提供及版权：Zoltan Kenwell (Infocus Imagery)
说明：
很少有极光能达到如此清晰的程度。上面的影像是用一台高级数码相机拍摄，捕捉到了上周发生在加拿大阿尔伯塔上空出现的特殊景象—异常活跃而又色彩缤纷的极光冕。就像一朵花一样，壮观的极光异常清晰。极光颜色鲜明，绿色和紫色是因为高空大气层内氧原子和氢原子与进入大气层的电子暴接触后发生反应引起。许多上镜的极光都是因为太阳风最近通过地球而引发的。极光的出现难以预计，因为最近太阳异常平静。 大家可以从《观星不完全手册》中找到极光专贴，编号是A18,链接地址
http://bootes.lamost.org/bbs/viewthread.php?tid=88666 ::070821_13.jpg::漂亮 绚烂夺目啊！ 这个极光图可是迷幻级别的！ ::070821_10.jpg::啥时候也见见真的。 2012年，两级磁场开始互倒，这是真的么。。？
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