[MIham] SPACE WEATHER BULLETIN

[FSK]

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

SPACE WEATHER ADVISORY BULLETIN #05- 10
2005 September 11 at 8:37 a.m. MDT (2005 September 11 1437 UTC)

**** SEVERE GEOMAGNETIC STORM OBSERVED ****

NOAA Region 808 continues to produce strong (R3) radio blackouts and has now
produced a severe (G4) geomagnetic storm.  Forecasters at the NOAA's Space
Environment Center (SEC) in Boulder, Colorado, observed the strong (G4)
geomagnetic storming between 2:00 a.m. and 5:00 a.m. EDT, on September 11.
This complex sunspot region is also responsible for an on-going moderate
(S2) solar radiation storm.  Periods of strong
(S3) solar radiation storms has been seen over the past two days.

The observed severe (G4) geomagnetic storm has produced aurora sightings
along the northern tier of the United States, and as far south as Arizona.
Agencies have experienced problems with fluctuations in their electric power
systems due to the severe levels of geomagnetic activity.  Spacecraft
operations, HF communications, and navigation systems such as GPS; are also
experiencing impacts due to the strong to severe solar activity.

Since this sunspot region made its appearance on the surface of the Sun on
September 07, it has produced five strong (R3) radio blackouts, and one
severe (R4) radio blackout (the fourth largest flare in the past fifteen
years).  This region has shown little signs of weakening.
Additional significant solar flares are expected for the next ten to eleven
days as this large region moves across the Sun.  Continued disruptions to
systems impacted by space weather are possible during this timeframe.

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



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