[LeArc] SPACE WEATHER ADVISORY BULLETIN #03- 6

[Duane Whittingham]

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

SPACE WEATHER ADVISORY BULLETIN #03- 6 2003 November 20 at 10:06 a.m. 
MST (2003 November 20 1706 UTC)

**** ACTIVE SOLAR REGIONS RETURN ****

The solar regions that produced dramatic space weather activity in 
late October and early November have returned to the visible side of 
the sun.
These large sunspot groups have been numbered as NOAA Region 501 
(previous Region 484), 507 (previous Region 488), and 508 (previous 
Region 486).  All three regions have decreased in size since last 
rotation; however, they are bright and show considerable magnetic 
complexity.  Region 501 has already produced a category R2 (moderate) 
radio blackout and spawned a category G4 (severe) geomagnetic storm, 
which began today, November 20th, at 2:04 a.m. EST (0804 UTC) and is 
strengthening.

The last flurry of activity associated with these regions produced 
perhaps the largest radio blackout (R5) measured by the NOAA GOES 
satellite in almost thirty years.  Moderate to strong activity is 
possible for the next two weeks as they make their transit across the 
visible disk.

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. For more 
information, including email
http://sec.noaa.gov/advisories or (303) 497-5127. The NOAA Public 
Affairs contact is Barbara McGehan at Barbara.McGehan@noaa.gov or 
(303) 497-6288.

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