Strange radio sky

A rather odd all-sky image appeared in the last hour. As you can see, the dominant flux seems to be coming from the Galactic plane, but away from the Galactic centre.

I am guessing that strong scintillation caused Cas A and Cyg A to particularly fade at that point and the autoscaling has thus highlighted the rest of the Galactic plane. In any case, Cyg A is pretty low to the horizon at this point.

Or perhaps there is a riometric event causing a sweep of absorption in the northwest (top-right, due to the sky-view orientation). After all, there has been some strong Solar activity in the last couple of days.

Still, it is an interesting all-sky image. It might make for a neat little project to investigate the data around this particular time.