NOAA SEC Space Weather Outlook #01- 20

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

SPACE WEATHER OUTLOOK #01- 20

2001 May 21 at 11:52 p.m. MDT (2001 May 22 0552 UT)

**** SPACE WEATHER OUTLOOK ****

Summary For May 14-20

Space weather reached moderate levels during the period. A category R2
(moderate) radio blackout peaked at 12:03 a.m. MDT on May 20 (2001 May
20 0603 UT) due to a major solar flare from beyond the Sun’s western
limb. Category R2 radio blackouts normally degrade high frequency radio
communication and low frequency navigation signals on the sunlit side
of Earth (for a complete list of adverse system effects, please refer
to the NOAA Space Weather Scales). Isolated category R1 (minor) radio
blackouts occurred during May 15 – 17.

Outlook For May 23-29

Space weather is expected to be at minor levels. There will be a fair
chance for isolated category R1 radio blackouts during the period.
There will be a slight chance for a category G1 (minor) geomagnetic
storm on May 23.

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.