I am sure it is long exposure time.
Being in North Carolina, I very rarely see auroras this far south.
Unless, like a few years back, we have intense solar activity with alot of flairs.
The red auroras are rare, but when the aurora is energetic, which is also when it moves farther south, it often has considerable red. The nightly aurors we see in Fairbanks are usually simply pale green. I saw an orange one once that looked like a McDonald's arch and it was nearly stationary for a couple hours. It was 40 below then, but I watched it the whole time. No camera unfortunately.
My husband just asked me if I knew what quadrant of the sky to look toward...........since i have no idea, I thought I would ask you. We're on the Atlantic coast near the VA/MD state line........