NOAA SEC Space Weather Outlook #01-19 — 15 May 2001

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

SPACE WEATHER OUTLOOK #01- 19

2001 May 15 at 04:25 p.m. MDT (2001 May 15 2225 UT)

**** SPACE WEATHER OUTLOOK ****

Summary For May 7-13

Space weather increased to moderate levels during the period. A
geomagnetic storm, which reached category G2 (moderate) on the NOAA
Space Weather Scale (SWS), occurred on 12 May. Category G2 geomagnetic
storms normally result in adverse affects on power systems, spacecraft
operations, and high-frequency (HF) radio communications (for a
complete list of adverse system effects, please refer to the NOAA SWS).
Intermittent category G1 (minor) geomagnetic storms occurred during the
period as well. Isolated category R1 (minor) radio blackouts occurred
on May 12 – 13. Category R1 radio blackouts typically result in minor
effects on HF radio communications and low-frequency (LF) navigation on
the sunlit side of Earth. A category S1 (minor) solar radiation storm
occurred during May 7 – 8 in the wake of a flare from beyond the west
limb of the Sun. Category S1 radiation storms usually result in minor
degradation of HF radio communications in the polar regions.

Outlook For May 16-22

Space weather is expected to be at minor levels. Isolated category R1
(minor) radio blackouts are expected 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.