Space Weather Outlook #00- 28 20 June 2000

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

SPACE WEATHER OUTLOOK #00- 28

2000 June 20 at 04:33 p.m. MDT (2000 June 20 2233 UT)

**** SPACE WEATHER OUTLOOK ****

Summary For June 12-18

Space weather reached strong levels during the period. A category R3
(strong) radio blackout occurred at 7:59 p.m. MDT on June 17 due to a
large solar flare. Category R3 radio blackouts normally result in some
or all of the following effects on the sunlit portion of Earth:
wide-area blackout of high-frequency (HF) communications signals with
loss of radio contact for mariners and en route aviators for about an
hour, and low-frequency navigation signals degraded for about an hour
affecting maritime and general aviation positioning. Category G1
(minor) geomagnetic storm conditions occurred from noon – 9:00 p.m. MDT
on June 14. Category G1 geomagnetic storms typically result in some or
all of the following effects: weak power grid fluctuations, minor
impacts on satellite operations, increased Auroral activity at high
latitudes, and possible effects on migratory animals.

Outlook For June 21-27

Space weather is expected to reach minor levels during the coming week.
Isolated category R1 (minor) radio blackouts are possible sometime
during the period. Should an R1 radio blackout occur, expect some or
all of the following effects on the sunlit portion of Earth: weak or
minor degradation of HF communication signals with occasional loss of
radio contact for mariners and en route aviators, and low-frequency
navigation signals degraded for brief intervals affecting maritime and
general aviation positioning.

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.