2023-07-25-雨後彩虹 Rainbow - a photo on Flickriver

2023-07-25-雨後彩虹 Rainbow

            7/25下午杜蘇芮颱風外圍帶來的間歇雨勢形成的彩虹，大台北地區應該很多地方都有人拍到。剛好經過中山橋看到天空出現彩虹，立刻停好機車趕緊拿出手機拍個幾張。

包括了「霓」、「主彩虹」、還有不甚明顯的「複虹」。
陽光在水滴內經過1次反射及2次折射，會出現「虹」（Primary Rainbow），也就是俗稱的彩虹，由於紫色光偏折角度最大、紅色光偏折角度最小，因此「虹」的色彩排列是內紫外紅。

在彩虹外圍出現淡淡的「霓」（Secondary Rainbow），是陽光在水滴裡是經過2次反射及2次折射，因此「霓」出現的角度會比「虹」來得高，寬度約為「虹」的2倍，且由於多一次反側，因此明顯度只有「虹」的10%，色彩排列也與「虹」相反，為內紅外紫。

在彩虹內圍出現的微小色彩稱為「複虹」（Supernumerary Rainbows），很不容易看見。有別於彩虹單純為雨滴折射光線所產生的現象，「複虹」是「繞射」現象的結果，要產生鮮明的複虹，通常雨滴要都接近大小類似的正圓，所以出現「複虹」時，大部分天氣是下著小雨的狀態。

彩虹光進入視線的角度通常在40-42度，但其實陽光還有還有其它的角度可以透過水滴進入視線，就形成一層一層的複虹，但是光的強度已經弱了許多。而在複虹其中的數條暗紋，是因為這些某些角度的光線會發生「破壞性干涉」而產生。

Taken in: Taiwan / Taiwan / Zhongshan / Yuanshan (show map)

Taken on: July 25, 2023

Tags:

Rainbow

彩虹

颱風

TAIWAN

TAIPEI

台灣

台北 « less

Sets appears in: • Personal Favourites • RAINBOW

Groups appears in: • Taiwan • Flickr Taiwan (English) more » • 心台灣 Heart of Taiwan • * Taiwan Flickr * Favorite Club • Flickr Taiwan • Sky Masterpieces • 台灣風景寫真 [Taiwan scenery] • iPhone Camera Shots • I ♥ iPhone • Clouds, Storms, Sunsets & Sunrises • 台灣之美 – Formosa: The Beautiful Island of Taiwan • Footprints in Taiwan! • 我的台灣，我的視野！Your Taiwan, Your View！ • Taiwan Walker 散步@台灣 (Post 1 Award 3) • Taiwan Photo Club • Taiwan Photographers • SKY DRAMA • Beauty Taiwan • Sky glory • Taiwan, Taipei images • Taiwan Is Beautiful • CSSS: Storms - Rainbows (CSSS Required) • CSSS: Earth - Urban Skyscapes • All About The Sky • CSSS: Earth - Vertical Images-Video Only (CSSS Required) « less

Camera: Apple iPhone 12 Pro Max, f/2.2, 1/1700 sec, 7.5mm, ISO 20 (more info) (hide info)

Camera:	Apple iPhone 12 Pro Max
Lens:	iPhone 12 Pro Max back triple camera 7.5mm f/2.2
Aperture:	f/2.2
Exposure Time:	0.001 sec (1/1700)
Focal Length:	7.5mm
ISO:	20
Exposure Bias:	0 EV
Flash:	Off, Did not fire
Exposure Program:	Program AE
Exposure Mode:	Auto
Metering Mode:	Spot
White Balance:	Auto
Color Space:	Uncalibrated
Software:	Adobe Photoshop 21.0 (Windows)
Show full info

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