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

SPACE WEATHER ADVISORY OUTLOOK #05- 37
2005 September 13 at 04:27 p.m. MDT (2005 September 13 2227 UTC)

**** SPACE WEATHER OUTLOOK ****

Summary For September 5-11
A large solar flare resulted in an R4 (severe) radio blackout on 07 September. Several R1 (minor), R2 (moderate), and R3 (major) radio blackouts occurred between 06 - 11 September due to multiple solar flares from a large sunspot group. A Category S3 (strong) radiation storm began on 08 September and was still in progress at the end of this summary process. Category G1 (minor) geomagnetic storming occurred on 10 September. Category G2 (moderate), G3 (strong), and G4 (severe) periods were observed on 11 September as a result of clouds of magnetic material associated with large solar eruptions on the Sun.

Outlook For September 14-20
Category R1 (minor), R2 (moderate), and R3 (Strong) Radio blackouts are possible due to solar flare activity from large sunspot Region 808.
Category G1 (minor) through G4 (severe) geomagnetic storms are possible due to eruptions on the Sun. Category S1 (minor) and S2 (moderate) solar radiation storms are also possible due to this very active sunspot group.

For current space weather conditions please refer to:
http://www.sec.noaa.gov/SWN/
http://www.sec.noaa.gov/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. More information is available at SEC's Web site http://sec.noaa.gov