Warning: Geomagnetic Storm

A K-5 geomagnetic storm is now hitting earth from Sun Region 2671. The active region is producing a minor C-Class flares that are now impacting earth and are expected until August 19, 2017.


Prepared jointly by the U.S. Dept. of Commerce, NOAA,
Space Weather Prediction Center.
UPDATED 2017 August 17 0030 UTC

.24 hr Summary...
Solar activity was very low with only B-class and optical subflares
noted from Region 2671 (N11E49, Ehc/beta-gamma-delta). Despite the lack
of activity, the region grew in areal coverage and developed mixed
polarities. The overall magnetic gradient was loose, but shear increased
within the regions intermediate spots penumbra with the development of
a delta signature.

A filament located at approximately N42E80, lifted into a prominence and
erupted from the limb between 16/1603-1658 UTC as reported by a USAF
observatory and as seen in GONG/H-alpha imagery. A CME was associated
with this event and was first clearly observed in SOHO/LASCO-C2 imagery
at 16/1636 UTC. Initial analysis indicted the CME is not likely to be

Solar activity is expected to remain very low with a chance for C-class
flares and slight chance for M-class flares (R1-R2; Minor-Moderate radio
blackouts) all three days (17-19 Aug) due primarily to the increased
magnetic complexity and structure of Region 2671.