NOAA SEC Space Weather Advisory Outlook #03- 18

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

SPACE WEATHER ADVISORY OUTLOOK #03- 18

2003 April 29 at 01:13 p.m. MDT (2003 April 29 1913 UTC)

**** SPACE WEATHER OUTLOOK ****

Summary For April 21-27

Space weather has reached moderate levels. A category R2 (moderate)
radio blackout occurred on April 26th at 2:07 A.M. MDT (0807 UTC) due
to an energetic solar flare on the sun. One particularly active
sunspot region, known to NOAA space weather forecasters as Active
Region 338, has produced numerous category R1 (minor) radio blackouts
over the past week. A number of returning coronal holes, and their
associated high speed solar wind, resulted in category G1 (minor)
geomagnetic storms on April 21st and April 23rd – 25th. For a list of
adverse system effects related to space weather storms, please refer to
the NOAA Space Weather Scales.

Outlook For April 30-May 6

Space weather for the next week is expected to be at minor levels with
the possibility of moderate level activity. A large active sunspot
region, known to NOAA space weather forecasters as Region 349, has been
quite active and may produce a category R1 (minor) or R2 (moderate)
radio blackout. The continuing appearance of coronal holes on the sun
and their associated high speed solar wind are expected to produce
category G1 (minor) geomagnetic storms.

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 services, see SEC’s Space Weather
Advisories Web site 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.