S.T.E.V.E. ?( Strong Thermal Emission Velocity Enhancement.)

This is a long exposure taken during the visible aurora (Northern Lights) in Shrewsbury, Shropshire on 1st January 2025 at 1919hrs. It was an accident that I actually captured this, the aurora itself was fading quickly in the north and I decided to try a long exposure looking west. This was the result, I think it's an example of the phenomina called STEVE or to give it it's long name Strong Thermal Emission Velocity Enhancement. It was running across the sky from due west to due east and lasted for just a few minutes, a second exposure just after this one failed to show anything.