Liz,
I have seen the Aurora Australis *once* in my lifetime, in 1989, from country South Australia.
It was a very dark site, and a few days after a massive solar flare / CME. Very faint, not colourful (the concensus in the group was its was white/grey), and it didn't reach very far above the horizon.
SO it is possible to see from mainland Australia, but I think rare, and as you say, pot luck depending on the sun. I expect it is far more common in southern Tasmania.
-Ivan
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