NOAA SEC Space Weather Outlook #00-53 19 Dec 2000

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

SPACE WEATHER OUTLOOK #00- 53

2000 December 19 at 10:19 a.m. MST (2000 December 19 1719 UT)

**** SPACE WEATHER OUTLOOK ****

Summary For December 11-17

Space weather reached minor levels during the period. An isolated
category R1 (minor) radio blackout occurred on Dec. 12. due to a
moderate-sized solar flare. Category R1 radio blackouts typically cause
the following system effects on the sunlit side of Earth: minor
degradation of high-frequency radio communication resulting in
occasional loss of radio contact and low-frequency navigation signals
degraded for brief intervals.

Outlook For December 20-26

Space weather is expected to reach minor levels. Isolated category R1
radio blackouts will be possible during the coming week with system
effects similar to those described above. Category G1 (minor)
geomagnetic storm conditions will be possible during Dec. 21 – 22 due
to an expected CME passage. Category G1 geomagnetic storms are
associated with the following system effects: weak power grid
fluctuations can occur and minor impacts on satellite operations are
possible. In addition, migratory animals are affected at this and
higher levels, and aurora is commonly visible at high latitudes
(northern Michigan and Alaska).

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.