© Seán O RiordanSean O'Riordan just managed to capture this stunning display at Eaglehawk Neck in south-east Tasmania.
Social media users in posted pictures of brightly coloured skies in Victoria, Tasmania, South Australia and across the Tasman in New Zealand.
However, much of New South Wales missed out on the spectacle due to heavy cloud and rain.
The Bureau of Meteorology has warned the storm that creates the beautiful auroras could also threaten infrastructure and essential services, including power supply.
The BoM's space weather forecasting centre said the storm's effects reached Earth on Friday night and would continue to Sunday morning.
The BoM said the best time to see the aurora australis was between Saturday 10pm and Sunday 2am, from a dark spot with unobstructed views south.
On Wednesday and Thursday, there were four coronal mass ejections (CMEs) from the sun, meaning highly charged plasma erupted and streamed into space. When those charged particles, known as the solar wind, hit the Earth's magnetic field, they create the stunning visual displays known as auroras.
"The last time a G5 geomagnetic storm was observed was in 2003," the BoM said in a statement.
( More here)
Comment: Related: "Severe Geomagnetic Storm" hits Earth, NOAA warning in effect all weekend