Northern lights in Australia tonight

Aurora australis works on the same physics as the northern lights, just mirrored at the opposite end of the planet. The display forms in a ring around the south magnetic pole, and how far that ring expands northward depends on the Kp index - a 0-9 scale of geomagnetic activity. Because most of mainland Australia sits a long way from the south magnetic pole, the Kp threshold here is higher than in Norway or Iceland. Tasmania, at 54°S magnetic latitude, needs Kp 5 - the lowest bar anywhere in the country.

Hobart and the south coast of Tasmania - South Arm, Bruny Island, Cockle Creek - face the Southern Ocean with an open horizon toward Antarctica and minimal light pollution. On the mainland, Wilson's Promontory in Victoria is the southernmost point and the best-placed dark site, though it still needs Kp 6-7. Melbourne and Sydney only see aurora during the rare G4-G5 storms, as happened in May 2024 when the display was photographed across Tasmania, southern Victoria and even from Sydney's outskirts.

The season here runs opposite to what visitors from the northern hemisphere expect. Australia's long, dark nights fall in autumn through spring (April to September), while December to February - the southern summer - has nights too short for useful darkness at these latitudes. Plan a Tasmania trip for the cooler months and face south, not north.