Looks like shadows cast by some objects (clouds near or below apparent horizon  perhaps) on the regular forward-scattered sunlight.

Commonly termed, crepuscular rays.....

Spectacular when they stream right across the sky and converge on the anti-solar point (see attached - leaving Bora Bora)

The phenomenon has been known for a long time.

An old description of the phenomenon can be found here:

SAO/NASA Astrophysics Data System (ADS)

Title: Sur les rayons lumineux divergents

Authors: Mascart, J.

Journal: Bulletin de l'Observatoire de Lyon, vol. 9, pp.151-155

Bibliographic Code: 1927BuLyo...9..151M

Since light pollution has erased the stars from the sky above my city, I now study atmospheric phenomena at twilight. I would appreciate some photographs of the sky at sunset or sunrise taken from your residence. If you want, please contact me at this address.

cross19@libero.it.

Greetings

Giovanni

L'Aquila city (Italy)