A Geomagnetic Storm
SpaceWeather.com Jun 04 2200
A sharp gust of solar wind hit Earth's magnetic field at approximately 20:30 UT on June 4th, sparking a G2-class geomagnetic storm. The storm is subsiding now, albeit slowly; high-latitude sky watchers should remain alert for auroras. Aurora alerts: text, voice.
aurora images: from Salllie Carlson of Lutsen, Minnesota, USA; from Boutin Gilles of St-Michel de Bellechasse Québec Canada; from Dirk Miller of Rice Lake, Wisconsin; from Noah Weston of Madison, Maine, USA; from Dominic Cantin of Québec city, Québec, Canada;.
See SpaceWeather.com -- News and information about meteor showers, solar flares, auroras, and near-Earth asteroids for links to further info.