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

SPACE WEATHER ADVISORY OUTLOOK #05- 37
2005 September 20 at 11:26 a.m. MDT (2005 September 20 1726 UTC)

**** SPACE WEATHER OUTLOOK ****

Summary For September 12-18
Large solar flares resulted in R3 (major) radio blackouts on 13 and 15 September. Several R1 (minor) and R2 (moderate) radio blackouts occurred between 12 – 17 September due to multiple solar flares from NOAA sunspot Region 808. A Category S3 (strong) radiation storm began on 08 September and ended on 16 September. Category G1 (minor) (12 –
15 September), category G2 (moderate) (12, 13, 15 September), and category G3 (strong) (15 September) geomagnetic storm periods were observed as a result of clouds of magnetic material associated with large solar eruptions on the Sun.

Outlook For September 21-27
No significant space weather is expected during the forecast period.

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