Transpower issued a grid emergency notice ahead of the storm, explaining the special impact of space weather on power supplies.
“Space weather is when the Sun ejects plasma and other matter in Earth’s direction. These coronal mass ejections (CMEs) are rare, and most people won’t notice because our planet’s magnetic field shields us from particles.”
McCraken’s Rest, Te Waewae Bay, in Southland. Photo / Edwin Mabonga
The resulting geomagnetic storms send currents that “have the potential to cause extensive damage” when they reach substation transformers or large hydroelectric dams.
Lines in the South Island were taken out of action overnight to protect critical infrastructure from the storm.
The Southern Lights over Te Anau. Photo / Robert Taylor
Last night’s display was caused by the second of three coronal mass ejections within the last 36 hours, Civil Defence New Zealand said.
Otautau, Southland. Photo / Edwin Mabonga
Solar storms have become increasingly frequent as the 11-year solar activity cycle hits a new high point.
The Fortrose coast. Photo / Leighton Findlater
The increased solar activity is expected to continue through the next several years as the cycle reaches a “solar maximum”.