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FW: Space Weather Bulletin **** POWERFUL SOLAR FLARE ERUPTS ****



All,

See below.

Rick
W2GPS
AMSAT President

**** POWERFUL SOLAR FLARE ERUPTS ****

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

SPACE WEATHER ADVISORY BULLETIN #05- 7     
2005 September 07 at 01:31 p.m. MDT (2005 September 07 1931 UTC)

**** POWERFUL SOLAR FLARE ERUPTS ****

One of the largest solar flares on record occurred today, September 07.
Very active Region 808 produced a powerful X17 flare (R4 on the NOAA
Scale) observed on the NOAA GOES satellite at 07/1740 UTC (September
07, 1:40 p.m. EDT). This flare, the 4th largest in the last 15 years,
erupted just as the Region 808 sunspot cluster was rotating onto the
visible disk of the sun. Intense radio emissions were also associated
with this flare. A very bright and fast coronal mass ejection was
observed on coronagraph imagery; however, the material was not Earth
directed. An S1 - S2 radiation storm is expected following this
eruption, but is not expected to begin until late on September 07 or
early September 08. 

This event created a complete blackout of high frequency communications
on the daylit side of Earth. Communications used by emergency services
along the Gulf Coast may have experienced problems due to this flare.
Low frequency navigation systems may also have experienced a period of
significant degradation.

Over the past two weeks, this active region produced a series of
significant solar eruptions as it made its passage around the back side
of the Sun. Significant eruptions are expected in the coming days.
Agencies impacted by space weather storms may experience disruptions
over the next two weeks. These include spacecraft operations, electric
power systems, HF communications, and low-frequency navigations
systems.

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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