ICYMI Aurora Australis Lit Up Australian and New Zealand Skies This Week

Overview

Stargazers in Tasmania and New Zealand are happy they didn't skip town for Vivid last weekend. On Sunday night, Aurora Australis made a pretty dramatic appearance, filling the horizon with a spectrum of light.

Also known as the Southern Lights, Aurora Australis tends to show up when a coronal mass ejection (CME) occurs. To cut a long story short, a CME happens when the sun releases a bunch of plasma filled with electrons and protons (the bits inside atoms, Year 7). This plasma travels 150 million kilometres before hitting the Earth's magnetic field at a speed of six million kilometres per hour. The result is a wild geomagnetic storm. As the atoms slow down, they send out light of various colours, which we see most easily at the North and South Poles, where the atmosphere is thinnest. In the North Pole, the aurora is called Aurora Borealis.

Like earthquakes, auroras are rated according to their power. While most rate around 1 or 2 kp (out of a possible 9), Sunday night's hit 7, making it particularly spectacular. It's difficult to predict when the next Aurora Australis will appear — your best bet is to keep an eye on the official Facebook page, where hopeful activity is reported.

If you're keen to cop an eyeful, then you'll need to head as far south as possible. It's also a good idea to get away from towns and cities, so light pollution doesn't corrupt your view. In Australia, that means making tracks to Tassie. On social media, epic photos of Sunday night's show came in from Devonport and Bruny Island. However, the lights were also seen as far north as New South Wales, including in Merimbula, Bawley Point and Williamstown.

Meanwhile, in New Zealand, the place to be was the South Island. Over the weekend, Aurora Australis was seriously impressive in Lake Te Anau, Dunedin, Invercargill, Waipapa Point and Queenstown, among other spots.

Here's a few otherworldly Instagrams to give you an idea:

How lucky have we been in #MySouthland this week with this breathtaking #auroraaustralis light show! Spectacular 📷 @the_curious_kiwi #nzmustdo #southlandnz

A post shared by Southland, New Zealand (@southland.nz) on May 30, 2017 at 5:19pm PDT

Sunday's breathtaking Aurora Australis as captured by staff member @purnellpictures out on the Otago Peninsula.😍#dunnerstunner #OnlyOtago #auroraaustralis

A post shared by University of Otago (@universityofotago) on May 29, 2017 at 10:02pm PDT

Incredible #AuroraAustralis in Tasmania's skies 😮. Tassie's the best spot in Australia to view the Southern Lights. Basically, the further south, the better. 📷: Sophie Fazackerly

A post shared by ABC News (@abcnews_au) on May 28, 2017 at 7:33pm PDT

NIGHT LIGHTS. The Milky Way with a hint of Aurora over Mount Iron earlier this week. Wanaka, NZ. #nightsky #milkyway #stars #aurora #auroraaustralis #southernlights #nzmustdo #purenewzealand #landscape #nofilter #astrophotography #stargazing #stars #starlight #lovewanaka #wanaka #mtiron #southisland #newzealand #longexposure #canon_photos

A post shared by @the_viewfinda on May 30, 2017 at 7:57pm PDT

After posting a photo of the Southern Lights yesterday people have asked me if I could really see them with the naked eye. The answer is YES. For a few very special minutes they danced like laser beams on the horizon line. The Milky Way stole the limelight afterwards. 🌌✨

A post shared by Kyle Te Kiwi | New Zealand (@barekiwi) on May 30, 2017 at 3:04am PDT

After posting a photo of the Southern Lights yesterday people have asked me if I could really see them with the naked eye. The answer is YES. For a few very special minutes they danced like laser beams on the horizon line. The Milky Way stole the limelight afterwards. 🌌✨

A post shared by Kyle Te Kiwi | New Zealand (@barekiwi) on May 30, 2017 at 3:04am PDT

Top image: Ben (Flickr).