大埔罕現「彩虹的微笑」倒掛天空?天文台拆解現象:唔係彩虹

文: 溫藹紅
2025.03.26

抬頭見「彩虹」對你微笑?這可能是大自然最浪漫的光學魔術,香港天文台早前透過社交平台分享一張大埔天空奇景,驟看為一道正在微笑的彩虹,引發市民熱議,天文台表示「其實唔係彩虹」,即睇點解?

香港現彩虹的微笑 天文台解釋奇景屬環天頂弧

天文台日前發布一張市民於3月13日,在大埔拍攝到相片,顯示一道七彩弧線倒掛天空上,猶如一道「彩虹的微笑」,不少人都以為是形態獨特的彩虹,不過當局就解畫強調「向我哋微笑緊嘅其實唔係彩虹」,實為罕見的「環天頂弧」,而照片左下角的光斑其實是「幻日」。

環天頂弧是甚麼?

天文台解釋,「環天頂弧」會出現在太陽上方,呈弧狀環繞天頂,而「幻日」通常會在太陽高度相若的左右兩邊出現,兩者都屬於光學現象,同樣源於陽光經過平浮於卷雲內的六角形碟狀冰晶,所產生的折射而成‌,因此肉眼便能見到這一道倒掛在天頂的七彩光弧。

天文台亦附上「氣象冷知識」短片,用動畫拆解日暈與幻日的生成。「環天頂弧」的形成是由陽光經冰晶的水平頂部進入,折射到其垂直側面射出,而太陽的入射角度要少於32度時才會形成,由於太陽的入射角度較低,有時「環天頂弧」會與幻日同時出現。若太陽照射的角度超過約32度,則只會產生單色(白色)的「幻日環 」

▼天文台解釋▼

資料及圖片來源:香港天文台

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