Twenty-two minutes after sunset and near the end of civil twilight I saw what looked like crepuscular rays. I see formations like these quite frequently, maybe a few times every month. To me, this phenomenon always seems more evident when the sun lies four to six degrees below the western horizon (it laid at five and a half degrees, in the above image). I also get the impression this happens more commonly during (or near) summer, when both humidity and aerosols tend to accumulate more heavily in the air.

Smartphone camera on Samsung Galaxy J3.

GNU Image Manipulation Program (GIMP) on GNU/Linux. (1) Levels to improve contrast, (2) slight saturation to enhance color, and (3) downscaling to 1,200 x 900 from the original at 2,576 x 1,932, which makes image noise less noticeable.