Space Weather Outlook #00-13 28 Nov 2000
Official Space Weather Advisory issued by NOAA Space Environment Center
Boulder, Colorado, USA
SPACE WEATHER OUTLOOK #00-13
2000 November 28 at 02:04 p.m. MST (2000 November 28 2104 UT)
**** SPACE WEATHER OUTLOOK ****
Summary For November 20-26
Space weather increased to category 3 (strong) levels during the period.
A large, complex sunspot group produced five major flares which
resulted in category R3 (strong) radio blackouts during Nov. 24 – 26.
Category R3 radio blackouts typically result in the following system
effects on the sunlit side of Earth: wide-area blackout of
high-frequency radio communication with loss of radio contact for about
an hour and degradation of low-frequency navigation signals for about
an hour. The major flares also caused a category S2 (moderate) solar
radiation storm that began on Nov. 24 and was in progress at the end of
the period. Category S2 radiation storms may result in the following
system effects: spacecraft may experience infrequent single-event
upsets, minor effects on high-frequency radio communication through the
polar regions, and navigation at polar cap locations possibly affected.
A category G1 (minor) geomagnetic storm occurred on Nov. 26 as a
coronal mass ejection passed Earth. A category G1 geomagnetic storm is
usually associated with the following system effects: weak power grid
fluctuations can occur, minor impacts on satellite operations are
possible, high-frequency radio signals can fade at higher latitudes,
migratory animals are affected, and aurora is commonly visible at high
latitudes (northern Michigan and Maine).
Outlook For November 29-December 5
Space weather is expected to be decrease to minor to moderate levels.
Category R2 (moderate) radio blackouts will be possible until Nov. 30
with system effects similar to those mentioned above. Isolated category
R1 (minor) radio blackouts are expected during the rest of the week.
Category G1 (minor) geomagnetic storm conditions are possible during
Nov. 29 – 30. A category S1 (minor) solar radiation storm will be
possible through Nov. 30.
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.
