Three-dimensional computer models based on observations from SOHO and NASA’s twin STEREO probes predict the CME will cross the void between sun and Earth in two days or less. NOAA forecasters estimate a 70% chance of polar geomagnetic storms when the cloud arrives on March 17th. … High latitude (and possibly even middle latitude) sky watchers should be alert for auroras this weekend.Incoming CMEs also have the potential to affect electronic systems in satellites and on the ground, but, historically, CMEs at this speed have caused mild to moderate effects at Earth.
Read more about today’s CME from NASA
What are coronal mass ejections?
Bottom line: The sun ejected a coronal mass ejection, or CME, on March 15. It is moving at a fairly high rate of speed and should arrive at Earth from within one to two days, creating a storm in Earth’s magnetic field and thus bringing auroras or northern lights. Stay alert for them this weekend!