Space Weather Advisory Outlook #02-17 – 23 Apr 2002

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

SPACE WEATHER ADVISORY OUTLOOK #02- 17

2002 April 23 at 01:14 p.m. MDT (2002 April 23 1914 UTC)

**** SPACE WEATHER OUTLOOK ****

Summary For April 15-21

Space weather reached strong levels during the period. Isolated category
R1 (minor) radio blackouts occurred on April 15 – 17 due to
moderate-sized solar flares. Category G1 (minor) to G3 (strong)
geomagnetic storms occurred during April 17 – 20 due to multiple CME
passages. A category S1 (minor) solar radiation storm occurred on April
17 following a moderate-sized long-duration solar flare. A category R3
(strong) radio blackout peaked at 7:51 p.m. MDT on April 20 (2002 21
April 0151 UTC) due to a major solar flare from the Sun’s western limb.
This flare also caused a category S3 (strong) solar radiation storm on
21 April. For a list of adverse system effects related to space weather
storms, please refer to the NOAA Space Weather Scales.

Outlook For April 24-30

Space weather is expected to decrease to minor levels. There is a chance
for isolated category R1 (minor) radio blackouts during the period. No
geomagnetic storms or solar radiation 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.