Purple

In maybe 1 out of 20 decent sunsets the sky turns purple. I dont know why this happens but I know I never have enough of this!

Photo statistics

Camera	Sony a6000
Lense	Sony selp 18-105
Focal length	18mm
Aperture	F4
ISO	100
Exposure time	1/80
Panorama?	yes - 3 Images
Location	Harlingen - Netherlands
Who am I, What do I do	http://bit.ly/2tDEhpP
Download this photos?	Yes: for private use - No: for commercial use!

Please give this post some steem! <3

p.s. I do appreciate all critique - please give me your input!