I'll have to research and try some of the different techniques and plug-ins everyone has mentioned. I am currently using Adobe CC which gives me access to PS and lightroom.
I have been able to shoot some great photos with my t2i but definitely struggle with noise for both the aurora and with shooting other subjects such as my daughter at her basketball games. With my current lenses I am constantly having to shoot at high ISO's which is causing the majority of the issues I seem to be having. I think I'll start with upgrading my lenses first with the Tokina 11-16 for the aurora and Canon 85mm f1.8 for sports and general photography.
Then maybe next year look at upgrading my camera to the Canon 6D or 7D mark ii.