Geomagnetic storms (the clue is in the name) can cause Aurora, but they can also throw out your electronics. KP9 I power off & unplug my MacBook (seriously). A geomagnetic storm struck Earth 1989. This geomagnetic storm caused a nine-hour outage of Hydro-Québec's electricity transmission system.

Right, how to take a photo. DSLR: Widest possible aperture f/3.5 - f/1.8 best (more light in) 28mm to 35mm wide lens best ISO 1600-3500 (the higher the grainer the pics will be) 10-30 seconds. Use a tripod or sitting on something still (wheat pack) Use self timer so you aren't shaking the camera

I know it's hard to forecast, but how is this expected to compare with the June event?