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紐西蘭.阿拉斯加極光.Katami看熊.挪威.瑞典.蒙大拿.日本雪猴.櫻花.加拿大邱吉爾看北極熊.西藏阿里.金色阿拉斯加極北直驅......
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生日當天遇見天文奇景-Moonbow月虹

如同年初和阿忠約定的,今年生日我一定要在國外旅行中度過,巧合的是,因行程安排緣故,10/20生日當天是在加拿大從Winnipeg往churchill的特慢火車上,原本預想整整兩天的火車之行應該會枯燥乏味,卻出乎意外令人終身難忘。
在火車上會歷經2個夜晚,對於我們3個愛好極光的旅人來說,能在火車上遇見極光,又是另一種追逐極光的夢想,因此,到了夜晚,就會看到我們用衣服將自己矇住趴在窗戶上的3個蠢樣,彼此叮嚀要隨時注意窗外是否出現極光,睡睡醒醒,醒醒睡睡.....
10/20生日這晚,我們難得花錢在火車上一起吃了頓晚餐,已經算是這趟旅行最奢侈的一頓了,菜色雖不盡完美,但氣氛和感受滿分,試想,一生中能有幾次這樣的生日?
用完餐回到自己座位,又來到夜晚的重頭戲--等極光,就在等待和一直向窗外張望的過程中,我和阿忠撇見窗外有一抹淡淡的半弧形的亮光,我們懷疑著這會不會是極光出現的徵兆,阿忠拿起相機拍下,放在相機中看這道亮光更明顯了,出現像是彩虹一樣的顏色,對於在今天之前從未聽過月虹Moonbow的我們來說,實在無法確定這到底是什麼,趕緊叫醒一旁已經睡著的MIKA起來看看到底是不是極光,MIKA立刻從睡夢中跳起,哈,果然也是個極光狂人,他看了看,確定的說這不是極光,我們3個雖然已極盡小聲避免吵醒其他旅客,但仍然引起火車上其他尚未睡著的乘客一陣騷動,紛紛來問我們看見什麼,我們於是SHOW出相機中的景象給大家看,好奇的人也拿出相機對著窗戶猛拍,其中一位退休的老先生則告訴我們那是夜晚的彩虹,因為月亮光而形成的。當時,我們對這說法半信半疑,因為無法相信月光也可以形成彩虹,直到下了火車進到民宿使用網路,第一件事就是上網查詢這到底是什麼現象,沒想到真的是夜晚的彩虹--月虹Moonbow,而且它的出現和形成比起極光更是難得,需要更多條件配合,這讓我們在準備出發看北極熊之前更加覺得自己這趟旅程將會非常的幸運。

我的生日"大餐",紅燒牛肉

我的"生日蛋糕",主廚蛋糕--味道實在不怎樣,粉甜~~

就是這樣等看極光的啦,好笑吧這兩個人

緊貼窗戶"手持"曝光25秒

緊貼窗戶"手持"曝光30秒

緊貼窗戶"手持"曝光40秒,噹噹~~厲害了吧佩服阿忠

簡單來說月虹形成條件就是,必須在月量將圓未圓(月光最亮時),月亮與地面角度小於42度,天空全黑,空氣中富含水氣等因素全部齊備之下方能形成,能看到的機率是非常低的,因此,盡管這趟火車之行未能如願以償看到極光,但能遇見更為難得的moonbow,真的覺得自己超超超級幸運的。

月虹Moonbow的形成原因(摘自維基百科)

A moonbow (also known as a lunar rainbow, lunar bow or white rainbow) is a rainbow produced by light reflected off the surface of the moon rather than from direct sunlight. Moonbows are relatively faint, due to the smaller amount of light reflected from the surface of the moon. They are always in the opposite part of the sky from the moon.

It is difficult for the human eye to discern colours in a moonbow because the light is usually too faint to excite the cone color receptors in human eyes. As a result, they often appear to be white.[1] However, the colors in a moonbow do appear in long exposure photographs.

A True Moonbow appears white, and is lit from the Moon itself. A colored rainbow when the sun is setting or when it is darker out is not a Moonbow because it is still partially lit from the remaining light in the sky. The term Moonbow was coined by Nick Whelan who sighted one of the first documented Moonbows in Eastern Utah.

A colored circle around the moon is not a moonbow—it is usually a 22° halo produced by refraction through hexagonal ice crystals in cirrus cloud. Colored rings close to the moon are a corona, a diffraction phenomenon produced by very small water droplets or ice crystals in clouds.

Moonbows are most easily viewed when the moon is near to full (when it is brightest). For other than those produced by waterfalls, the moon must be low in the sky (less than 42 degrees and preferably lower) and the sky must be dark. And of course there must be rain falling opposite the moon. This combination of requirements makes moonbows much more rare than rainbows produced by the sun.

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