NOAA SEC Space Weather Advisory Outlook #02-18 — 30 Apr 2002

Official Space Weather Advisory issued by NOAA Space Environment Center

Boulder, Colorado, USA

SPACE WEATHER ADVISORY OUTLOOK #02- 18

2002 April 30 at 11:35 a.m. MDT (2002 April 30 1735 UTC)

**** SPACE WEATHER OUTLOOK ****

Summary For April 22-28

Space weather reached strong levels during the period. The category S3
(strong) solar radiation storm that began on April 21 continued through
April 22 – 23. The solar radiation storm decreased to a category S1
(minor) storm on April 24 – 25. A category G1 (minor) geomagnetic
storm occurred on April 23 due to a coronal mass shock arriving at
Earth. An isolated category R1 (minor) radio blackout occurred at 3:56
p.m. MDT on April 24 due to a moderate solar flare. For a list of
system effects related to space weather storms, please refer to NOAA
Space Weather Scales.

Outlook For May 1-7

Space weather is expected to be at minor levels with a chance of
moderate activity. On May 4 the a previously active region is due to
rotate back onto the visible solar disc and may result in moderate
radio blackout (R2) activity. No geomagnetic storms are expected.

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 or
(303) 497-5127. The NOAA Public Affairs contact is Barbara McGehan
at bmcgehan@boulder.noaa.gov or (303) 497-6288.