On August 2nd, the sun hurled a cloud of plasma (Coronal Mass Ejection – CME) toward Earth when magnetic fields above sunspot 1261 erupted. Analysts expect the CME to arrive during the early hours of August 5th, possibly sparking geomagnetic storms around the poles.
This is not a big event; the eruption that propelled the cloud in our direction registered only “M1” (for medium) on the Richter Scale of Flares. Nevertheless, sky watchers at high latitudes should be alert for auroras.
Yesterday’s M1-class eruption from sunspot 1261 was observed by three spacecraft: SOHO, STEREO-A and STEREO-B. Using data from those three points of view, analysts at the GSFC Space Weather Lab have made a 3-dimensional model of the CME now en route to Earth (click for a larger view):
According to their work, the CME left the sun traveling 900 km/s and should reach Earth (denoted by a yellow dot in the simulation) on August 5th at 0300 UT plus or minus 7 hours. Another cloud produced by today’s M-flare may be right behind it; stay tuned for movies of that one, too. Mild to moderate geomagnetic storms are possible when these CMEs arrive on August 5th and 6th.
Filed under: The Sun
