Equinox Auroras

EQUINOX AURORAS: On Tuesday night, the sun’s magnetic field near Earth tipped south. This opened a crack in Earth’s magnetosphere. Solar wind poured in and fueled a magnificent display of arctic Northern Lights.

Thilo Bubek took the picture not far from Tromsø, Norway. “We had some nice auroras,” he says, with what can only be described as Norwegian understatement. “The clouds and calm sea contributed to a photogenic scene.”

This is the time of year when south-pointing magnetic fields from the sun frequently puncture our bubble of protection against the solar wind. High latitude sky watchers should be alert for equinox auroras.

Space Weather