一位在美國印第安納州的網友拍下了這個奇異的天空變化,很明顯:有人在天空上開派對 (誤)。在影片中,太陽很明顯被雲朵遮住,卻有奇妙的光線不停地閃爍。讓我們先來看看這個奇景:
上頭就像是有派對燈是有個燈塔閃爍個不停,但如果就依照科學角度來解釋,這應該是個叫做幻日 (sundog) 的現象。
![](http://teepr.com/wp-content/uploads/2015/06/Sundog.gif)
這是一種大氣光學的現象,因為天空中漂浮著大量的冰晶,進而折射太陽的光線,所以真實太陽的兩側約22度角折射製造出兩個太陽的虛像。曾經在蒙古還一次看過5個太陽的情況。
![Sundogs are created when sunlight is refracted by large, hexagonal ice crystals, such as those in snowflakes. Shown is one over Fargo, North Dakota. They typically appear as two coloured patches of light either side of the sun and though rare, can in theory be seen anywhere in the world in any season](http://teepr.com/wp-content/uploads/2015/06/29E54A1000000578-3136061-Sundogs_are_created_when_sunlight_is_refracted_by_large_hexagona-a-42_1435065735223.jpg)
這個現象的出現是取決於卷雲的密度、厚度、高度、以及觀察者的位置等。當高空狀況改變的時候,晶體也會以不同的角度來折射太陽光,進而也會讓光線有跳動的感覺。
![The scientific explanation for what is going on is almost certainly linked to an atmospheric explanation known as a sundog. This occurs when a luminous halo ring appears around the sun, when light interacts with ice crystals in the atmosphere. A diagram of the jumping sundog effect is shown](http://teepr.com/wp-content/uploads/2015/06/29E69A7800000578-3136061-The_scientific_explanation_for_what_is_going_on_is_almost_certai-a-36_1435079639917.jpg)
這樣的光學現象雖然罕見,但也有機會出現在世界各處,只要光線通過高空冰冷雲朵當中的冰晶折射,就有機會看到。
![The video of jumping sundogs was filmed above Greenwood, Indiana. It shows a beam of light flickering among some clouds and moving. The effect is due to electric fields changing in the sundog. This occurs when light from the sun reflects in a certain way. The beam of light can be seen here in the middle](http://teepr.com/wp-content/uploads/2015/06/29E4402200000578-3136061-A_video_of_jumping_sundogs_was_filmed_above_Greenwood_Indiana_It-a-40_1435065611761.jpg)
來源:Daily Mail
來人啊!音樂請下:大自然真奇妙~就看你有沒有注意到~(洩漏年齡惹…)
(往下還有更多精彩文章!)