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Postal worker astonished by white rainbow at Wuhe Tableland in Hualien

Postal worker astonished by white rainbow at Wuhe Tableland in Hualien

2022-12-09

Now let’s take a look at a natural phenomenon you’ve probably never seen before. A newspaper deliverer in Hualien recently encountered a rainbow with no color! She was delivering papers near Wuhe plateau, when she was astonished to see a ghostly white bow form in the sky. Let’s look at how and where these white rainbows can occur.

White mist hangs over a tea plantation. The water vapor, reflecting sunlight, has formed an amazing rainbow, all white. It cuts across the horizon, bridging green fields and blue sky. The witness was passing by this tea farm on Wuhe plateau in RuisuiTownship, when she was stopped in her tracks by this rare sight. She immediately took her phone out.

Hsia Yu-chih
Postal worker
A white rainbow is a really rare sight. I’ve been delivering newspapers for 35 years and this is the second time I’ve seen one. It’s such good luck.

A white rainbow is also known as a fog bow. It’s an optical effect – literally a rainbow made of fog instead of rain. The strange phenomenon often appears on low rolling hills or plateaus. But why doesn’t it have any colors? The answer lies in the size of the water droplets in fog.

Tan Lien
Hualien Weather Station
The reason that fog bows occur is that the water droplets, which the light is bouncing off, are smaller. They are drops of water produced by fog or mist, so they don’t have the seven colors of a rainbow.

The head of Hualien Weather Station explains that in order to see a fog bow, the sun needs to be directly behind you. You also need to be very low to the ground, or even below the level of the ground. Then this ethereal white bow might be within reach.

花蓮瑞穗驚現罕見美景 氣象局揭密「白色彩虹」條件

2022-12-09

限定版的自然美景,意外出現在花蓮瑞穗!有民眾早上送報時,經過〝舞鶴台地〞的一處茶園,發現天空中有一道"白色彩虹",讓她直呼真的好漂亮,趕緊拿出手機,拍下罕見的自然景象。但彩虹為什麼只有白色,氣象站解釋,因為陽光折射水滴非常小,光譜分散不開,才會只呈現白色。

茶園上方瀰漫白霧,水氣被陽光折射,在天空中形成一道虹橋,白色彩虹橫跨天際線,搭配背景的青山藍天,美不勝收。有民眾前往花蓮瑞穗的舞鶴台地,行經一處茶園邊,發現罕見的白色彩虹就在眼前,立刻用手機捕捉美景。

[[目擊民眾 夏玉枝]]
“白色彩虹真的是很少見,我送報35年第二次見到,真的太幸運了”

白色彩虹其實就是所謂的"霧虹",類似於彩虹的一種光學現象,看來像是一座拱形霧門,這種奇異的自然景像,通常出現在丘陵或台地,但為什麼不是呈現七彩顏色,而是單一純白,答案就在霧氣中的水滴大小。

[[花蓮氣象站主任 譚廉]]
“產生霧虹的情況是因為 (陽光)照射的水分子更小,它可能就是一些霧氣、雲氣產生的水珠,所以它不會像彩虹有七彩的顏色”

氣象站主任表示,要看見霧虹,太陽需在觀測者的頭部後方,並且貼近或低於地平面,才能欣賞限定的"白色彩虹"。

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