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Thanks for the replies. In photos you generally see, aurorae are red and/or green so I hadn't quite realised they could be colourless. A work colleague told me once about an aurora he saw appear at Lake Cargelligo in western NSW - he said it was as if a city had suddenly sprung up just over the horizon and I was reminded of that when I saw the one on Monday. The one I saw at Lake George however was instantly recognisable from the distinctive shade of red it was.
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