Space Weather Advisory Outlook #02-21 — 21 May 2002

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

SPACE WEATHER ADVISORY OUTLOOK #02- 21

2002 May 21 at 11:23 a.m. MDT (2002 May 21 1723 UTC)

**** SPACE WEATHER OUTLOOK ****

Summary For May 13-19

Space weather reached moderate levels due to geomagnetic storms.
Category G1 (minor) to G2 (moderate) geomagnetic storms occurred on May
14. Category G1 storm conditions also occurred during May 18 – 19
during a CME passage at Earth. Isolated category R1 (minor) radio
blackouts occurred on May 15 and 17 due to moderate-sized solar flares.
There were no solar radiation storms during the period. For a list of
adverse system effects related to space weather storms, please refer to
the NOAA Space Weather Scales.

Outlook For May 22-28

Space weather is expected to be at minor to moderate levels. There is a
chance for isolated category R1 (minor) to R2 (moderate) radio
blackouts during the period. There is a slight chance for category G1
(minor) geomagnetic storm conditions during May 23 – 25. There is also
a slight chance for a category S1 (minor) solar radiation storm during
the period.

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.