NOAA SEC Space Weather Advisory #03- 17

2003 April 22 at 01:50 p.m. MDT (2003 April 22 1950 UTC)

**** SPACE WEATHER OUTLOOK ****

Summary For April 14-20

Space weather has reached moderate levels. A category R1 (minor) radio
blackout occurred on April 18th at 1:58 P.M. MDT (1958 UTC) due to an
energetic solar flare on the sun. A large coronal hole produced high
speed solar wind, which then interacted with the Earths magnetic field
and resulted in a category G1 (minor) geomagnetic storm. This storm
lasted from April 14th through April 18th and reached the G2 (moderate)
level for a brief period on April 16th. For a list of adverse system
effects related to space weather storms, please refer to the NOAA Space
Weather Scales.

Outlook For April 23-29

A category G1 (minor) geomagnetic storm is possible during in the week
due to another coronal hole rotating into and Earth directed position.
This coronal hole may produce a G1 geomagnetic storm.

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.