INFO FROM SIDC - RWC BELGIUM 2013 May 18 13:02:20

Solar activity has been low, NOAA AR 1748 produced a C6.0 flare with peak
at 03:45 UT. This remains the most active region, although it is decreasing
in complexity, and may lose its delta configuration soon. M-class flares
can be expected, and X-class flares remain possible. Proton levels are
decreasing, but are still slightly over the threshold for 10 MeV. A shock
arrived to the Earth at 00:30 UT, it corresponds to the CME from May 15. It
arrived later than expected, which can happen for glancing blow events. A
short sheath was seen right after the shock. A solar wind speed of 450 km/s
and Bz up to -15 nT caused Kp = 5, between 00:00 UT and 06:00UT, while the
local Dourbes K value went up to 4. The CME from May 17 is expected to
arrive around noon on May 19 and cause up to major geomagnetic storms.