This video shows some flickering. Some of the files are brighter than most. When exposure is corrected by Lightroom instead of in camera for specific reasons this suddenly shows. The files were uniformly processed so either Lightroom has an inconsistency in its processing or the Aurora was flashing in her brightness which can't be detected by the naked eye. Or the camera has an inconsistency but the exposure was manual so every exposure was the same so changes in measuring light is not the case.