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

SPACE WEATHER ADVISORY OUTLOOK #11- 40
2011 September 13 at 02:18 p.m. MDT (2011 September 13 2018 UTC)

**** SPACE WEATHER OUTLOOK ****

Summary For September 5-11
Category R1 (Minor) radio blackouts were observed on 05, 09, and 10
September due to flare activity from active sunspot Regions 1283 and
1286.  An R2 (Moderate) radio blackout was observed on 08 September due
to flare activity from sunspot Region 1283.  R3 (Strong) radio
blackouts were observed on 06-07 September from Region 1283.

A category G2 (Moderate) geomagnetic storm occurred on 09 September due
to an earth directed coronal mass ejection.  Category G1 (Minor)
geomagnetic storm conditions occurred on 10 September due to continued
effects from the coronal mass ejection.

Outlook For September 14-20
R1 (Minor) and possible R2 (Moderate) radio blackouts are expected from
18 - 20 September due to the return of old Region 1286.

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. More 
information is available at SWPC's Web site http://swpc.noaa.gov