SPACE WEATHER ADVISORY BULLETIN #05- 11

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

SPACE WEATHER ADVISORY BULLETIN #05- 11
2005 September 14 at 11:30 a.m. MDT (2005 September 14 1730 UTC)

**** MORE MAJOR SOLAR FLARES EXPECTED FROM ACTIVE NOAA REGION 808 ****

NOAA sunspot Region 808 continues to produce major solar flare activity
as it rotates to the center of the visible surface of the Sun. On
September 13, this sunspot region produced three solar flares that
resulted in strong (R3) radio blackouts. A large Earth-directed
coronal mass ejection (CME) erupted during one of these flares, and is
expected to create a significant geomagnetic disturbance late today or
early on September 15. A moderate (S2) radiation storm is in progress
following yesterday's flare activity.

Active Region 808 has decayed slightly over the past 48 hours; however,
it is still a large and complex sunspot group capable of producing
major flares. Because of the current position of this region on the
Sun, further flare activity has greater potential to impact Earth.
Major flare activity over the next few days may result in significant
geomagnetic and radiation storms.

The threat of significant solar activity from Region 808 will diminish
as it rotates to the far side of the Sun on September 21-22. Agencies
impacted by space weather storms should continue to closely monitor
space weather conditions during the next week.

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