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