Hi All

I hope this is the right forum for this posting.
I took this and other pictures in bright sunlight. The sun was behind me and i used a lens hood. When i look at the image with forensic tools there appears to be diagonal lines (like rain) in the open sky. I have tried to replicate this at home but no success. If it was a dirty sensor i would expect vertical or horizontal lines.
I use a lens dust filter but that also looks clean.
Any advice would be appreciated and should this be a normal phenomenon would it be accepted by the screeners?