HELIOSPHERIC CURRENT SHEET: Today, April 7th, Earth is expected to cross through a fold in theheliospheric current sheet. The crossing could trigger unsettled conditions in our planet's magnetic field. NOAA forecasters estimate a 50% chance of minor geomagnetic storms. Aurora alerts: text or voice
A SUNSPOT IN THE OFFING: Solar astronomers are monitoring the eastern limb of the sun, where plumes of plasma and flashes of electromagnetic radiation are heralding the approach of a new sunspot. Philippe Tosi of Nîmes, France, photographed the maelstrom from his backyard observatory on April 7th.