A time table for Aurora Borealis....
...I can not give you. But does a Arora Borealis Forecast help?
I called an expert, and he told me they (his colleagues) can tell the possibility for seeing it 2-3 days in advance.
Some links for you:
http://www.spaceweathercenter.org/stormalert/04/04.html
''Forecast''.
http://www.spaceweathercenter.org/our_protective_shield/04/04.html
http://sec.noaa.gov/pmap/
Showing the activity right now.
http://geo.phys.uit.no/
Tromsø.
http://haldde.unis.no/
Svalbard.
I have seen it only a few times from Oslo, but not as beatiful as those pictures, so the odds are not that good here.
I guess the best place in Norway must be far north, like Troms and Finnmark (Alta, Tromsø, Hammerfest?).
Far north = no sun at all in the winter. And if you are far from a village there are no lights at all - no wonder why they love it when they can see Aurora Borealis, then!
I have been to Finnmark; Kirkenes, Tana, Varangerbotn, Vadsø and Vardø:
The nature is not at all like Lofoten - it's flat, no peaks in sight.
So if you really want to go up there once in your life, but have trouble to decide winter or summer; why not winter? I'm sure you have seen the sun almost like the midnight sun, but not Aurora Borealis, and the nature is not that interresting, so it does not matter it's dark most of the time. (They do not see the sun, but it gets a little less dark in the middle of the day.)
Put wool next to your skin (soft wool) and more wool, and one more layer of wool, really good boots (socks made of wool!), scarf, and some wool on your head, and go up there in the winter!
Take the boat Hurtigruta and see North Cape from the sea, and hope for Aurora Borealis!
And I guarantee no mosquitoes!
Far south they call it Aurora Australis = southern lights.
Northern lights = Nordlys in Norwegian - and that is the name of a newspaper too.
I hope I helped.

Liv.