October 13th began with an explosion on the sun.
At 00:43 UT, sunspot AR1865 erupted, producing an
M1-class solar flare and an Earth-directed CME.
NASA's Solar Dynamics Observatory captured the explosion's
flash of extreme UV radiation:
Soon after the flare, the Solar and
Heliospheric Observatory recorded a faint CME emerging
from the blast site. Based on the approximate speed
of the expanding cloud, between 600 km/s and 800
km/s, it will probably reach Earth on Oct. 15-16.
Polar geomagnetic storms are possible when the CME
arrives.
Source:
http://www.spaceweather.com/
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