I'm happy that you liked my attempt at the aurora - nothing like a bit of positive feedback to make me smile!
I know the original question wasn't about 'how to' take the northern lights but I aim at ...............
Warm clothes
small flashlight
shoot in RAW - you can improve them on the computer quite a lot sometimes
tripod - always
use a remote if possible or the delay feature (to eliminate camera movement)
lowest aperture # available
IS0 200-400
Shutter speed depends on amount of light available - experiment - I've had success at 10-30 secs
If 30 secs isn't enough for a decent capture bump up the ISO.
Check for northern light activity at
Solar Terrestrial Dispatch - Leaders in Space Weather Forecasting Services
Check the weather before leaving town!