Space Weather Outlook #00-50 21 November 2000

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

SPACE WEATHER OUTLOOK #00- 50

2000 November 21 at 12:15 p.m. MST (2000 November 21 1915 UT)

**** SPACE WEATHER OUTLOOK ****

Summary For November 13-19

Space weather was minor during the period. Category R1 radio blackouts
on 14 and 18 November. Category R1 radio blackouts typically result in
the following system effects on the sunlit side of Earth: Weak or
minor degradation of HF radio communication on sunlit side, occasional
loss of radio contact and low-frequency navigation signals degraded for
brief intervals. A proton event that started during the last period,
subsided slowly and ended during the first day. Before ending,
category S1 was observed. Category S1 solar radiation storms may
result in the following system effects: minor impacts on HF radio in
the polar regions. No geomagnetic storms reaching G1 level occurred.

Outlook For November 22-28

Space weather is expected to increase to moderate levels during the
period. Isolated category R2 (moderate) radio blackouts are possible
during the coming week. Category R2 radio blackouts normally result in
the following system effects on the sunlit side of Earth: limited
blackout of HF radio communication on sunlit side, loss of radio
contact for tens of minutes, and degradation of low-frequency
navigation signals for ten of minutes.

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.