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今天好天氣，
好幸運看到「彩虹雲☁️」 好美喔！
聽說看見彩虹雲會幸運一整年❤️
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台灣一般俗稱這種景象叫「彩虹雲」
美國則稱為「火彩虹」（Fire Rainbow）
豐沛的水氣加上太陽光線的折射，才出現這種罕見自然現象。產生這種現象的特殊條件是高空捲雲所在的位置需超過兩萬英呎，捲雲層裡的冰晶數量要足夠，加上太陽光照射捲雲層的角度剛好為58度才會形成彩虹雲景象。

今天彩虹雲都是在太陽周遭出現～
超壯觀！
遍佈範圍算大！只是彩虹雲通常時間都不會太長，能看到真的很不容易。
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分享幸運給大家！
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When parts of clouds are thin and have similar size droplets, diffraction can make them shine with colours like a corona. In fact, the colours are essentially corona fragments. The effect is called cloud iridescence or irisation, terms derived from Iris the Greek personification of the rainbow.

The usually delicate colours can be in almost random patches or bands at cloud edges. They are only organised into coronal rings when the droplet size is uniform right across the cloud. The bands and colours change or come and go as the cloud evolves. They occur most often in altocumulus, cirrocumulus and especially in lenticular clouds. Iridescence is seen mostly when part of a cloud is forming because then all the droplets have a similar history and consequently have a similar size.

Sometimes iridescence can be seen far from the sun but is most frequent near to it. As for coronas, search safely by hiding the sun behind a building and, even better, also viewing the reflection of the sky in water.

Very much rarer iridescence is that of nacreous or mother-of-pearl clouds. They can glow very brightly and are far higher than ordinary tropospheric clouds. Iridescence is also seen in rocket exhaust trails.
🔖 英文資訊： #IridescentClouds

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