this is the australian government website that monitors radio and space services, including aurora's and the suns flares.
http://www.ips.gov.au/
and the url for the space weather..
http://www.ips.gov.au/Main.php?CatID=2
no current alert for australia for aurora's but there is geomagnetic warning for the sun.
you can also report aurora's at this website and look at other reports.