A new NASA Sun Science mission is addressing how substorms -- disruptions in the magnetic field that throw large amounts of radiation at the planet’s surface -- can cause auroras, disrupt GPS communications and, at their most intense, damage power grids: http://go.nasa.gov/2ibZdPB | NASA - National Aeronautics and Space Administration

G1 GEOMAGNETIC STORMING BEGINS The high speed solar wind stream from the coronal hole in the Sun has arrived. Magnetic fields within the stream are linking to Earth's magnetosphere, G1-G2 class geomagnetic storms on Sept. 14-15. High-latitude sky watchers should be alert for auroras | John Traczyk