GLANCING-BLOW CME, INCOMING: A CME launched from sunspot AR2014 on March 23rd is expected to deliver a glancing blow to Earth's magnetic field on March 25th. NOAA forecasters estimate a 30%-40% chance of polar geomagnetic storms on March 25-26.
LONG-DURATION FLARE: On March 23rd around 0330 UT, the magnetic canopy of sunspot AR2014 became unstable and erupted, producing a long-duration C-class solar flare. Although C-class flares are considered to be minor, this one lasted so long (several hours) that it unleashed the energy-equivalent of a much stronger flare. NASA's Solar Dynamics Observatory recorded the action.
Slow flares usually produce CMEs and this one was no exception. The Solar and Heliospheric Observatory (SOHO) recorded a bright cloud emerging from the blast site: movie. The CME was not aimed at Earth. Nevertheless, it will have an effect on our planet. NOAA analysts say the CME will deliver a glancing blow to Earth's magnetic field on March 25th.
source:http://www.spaceweather.com/
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