NOAA / Space Weather Prediction Center

SWPC Space Weather Advisory

Official Space Weather Advisory issued by NOAA Space Weather Prediction Center Boulder, Colorado, USA

2011 December 27 at 8:45 a.m. MST (2011 December 27 1545 UTC)


Summary For December 19-25

Category R1 (Minor) radio blackouts were observed on 25 December due to flare activity from active sunspot Region 1387.

Outlook For December 28-January 3

Category G1 (Minor) geomagnetic storms are expected 28 and 29 December due to multiple coronal mass ejection arrivals. A slight chance for category S1 (Minor) solar radiation storms exists until 31 December due to solar flare activity from Region 1387. R1 (Minor) radio blackouts are expected until 31 December.

For current space weather conditions see: Space Weather Now, Today's Space Weather and Space Weather Alerts

Data used to provide space weather services are contributed by NOAA, USAF, NASA, NSF, USGS, the International Space Environment Services and other observatories, universities, and institutions. For more information, including email services, see SWPC's Space Weather Advisories Web site or (303) 497-5127.

NOAA Space Weather Scales - Description of catagories used in Outlooks.