Daysleeper, are you saying the aurora itself was located at an altitude of 25,000 feet, or that you were flying at that altitude at the time you observed it far above you? If the former, could you go to the other thread, in Questions, "Have you ever seen aurora below or 'around' your aircraft", and report and submit the questionnaire - trying to systematically gather reports of such low-altitude aurora because it's supposed to be impossible!