gohomeman1 发表于 2009-10-29 15:15

APOD091029:7月底智利Verde湖上空的黄道光

本帖最后由 gohomeman1 于 2009-10-29 15:28 编辑

感谢S兄和江涛兄的多日努力,APOD最近基本都由他们包办了。今天我就发一个吧:
http://apod.nasa.gov/apod/ap091029.html

Zodiacal Light Over Laguna Verde
http://apod.nasa.gov/apod/image/0910/zodiacal_soria.jpg
Credit & Copyright: Manel Soria
Explanation:
An unusual triangle of light is visible this time of year just before dawn, in the northern hemisphere. Once considered a false dawn, this triangle of light is actually Zodiacal Light, light reflected from interplanetary dust particles.The bright reflecting triangle is clearly visible on the right of the above imagetaken from Laguna Verde near Valparaíso, Chile in late July.The band of our Milky Way Galaxy on the left mirrors the zodiacal band.Zodiacal dustorbits the Sun predominantly in the same plane as the planets: theecliptic.Zodiacal light is so bright in the north this time of year because thedust band is orientednearly vertical at sunrise,so that the thick air near the horizon does not blockout relatively bright reflecting dust.Zodiacal light is also bright forpeoplein Earth's northern hemisphere in March and April just after sunset.In the southern hemisphere,zodiacal light is most notable after sunset in late summer, and brightest before sunrise in late spring.

gohomeman1 发表于 2009-10-29 15:17

今天的APOD大图非常大,达4256X2832,所以贴的是成大的镜像。
http://apod.nasa.gov/apod/image/0910/zodiacal_soria_big.jpg

http://www.phys.ncku.edu.tw/%7Eastrolab/mirrors/apod/image/0910/zodiacal_soria_big.jpg

gohomeman1 发表于 2009-10-29 15:21

成大翻译,其中那个没翻译出来的词Laguna已经在标题写了,那是一个湖,由于我没仔细去查询资料,无法确认它是盐湖还是泻湖或者是淡水湖。译文没有校对过,如果有错误之处,请大家指出来。
http://www.phys.ncku.edu.tw/~astrolab/mirrors/apod/ap091029.html

智利.Laguna Verde上空的黃道光
影像版權與提供: Manel Soria
說明:
在每年這段期的北半球,日出前的東方天空會出現一團不尋常之三角形暈光。這種以前曾被稱為是假黎明的輝光,正確的名稱為黃道光 (Zodiacal Light),來自被行星際塵埃微粒反射的太陽光。上面這張7月底從智利.Valparaiso的Laguna Verde拍攝的影像之中右方,就能見到這團三角形的暈光。而影像左端看起來像是黃道光鏡像的條狀光暈,則可以見到我們銀河系的盤面。絕大部份的黃道塵埃,在被稱為是黃道的行星軌道面上繞太陽運行。在每年的這段期間,黃道光之所以會特別亮,則是因為日出時塵埃帶的指向幾乎是垂直的,所以較亮的反光塵埃不會被地平面附近的厚重大氣給遮蓋。在每年的三、四月緊鄰著日落之後,北半球的居民也可以看見明亮的黃道光。而對南半球的居民來說,在晚夏的日落後,可以看見明亮的黃道光,不過以在春天的日出前最明亮。

skyczheng 发表于 2009-10-29 21:03

很幽静的画面!如果住在这附近该多好啊!
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