NOAA SEC Space Weather Outlook #01-4 23 Jan 2001

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

SPACE WEATHER OUTLOOK #01- 4

2001 January 23 at 10:01 a.m. MST (2001 January 23 1701 UT)

**** SPACE WEATHER OUTLOOK ****

Summary For January 15-21

Space weather reached moderate levels during the period. An isolated category R2 (moderate) radio blackout occurred on Jan. 20 as the result of a large solar flare. Category R2 radio blackouts are commonly associated with the following system effects on the sunlit portion of Earth: limited blackout of high frequency radio communication resulting in loss of radio contact for tens of minutes and degradation of low-frequency navigation signals for tens of minutes. There were also isolated category R1 (minor) radio blackouts observed during Jan. 19 – 21. A brief category G1 (minor) geomagnetic storm occurred on Jan. 21. Category G1 geomagnetic storms normally result in minor impacts on power systems and satellite operations. Migratory animals are also affected at this and higher levels of geomagnetic field activity.

Outlook For January 24-30

Space weather is expected to be at minor levels. There will be a fair chance for category G1 (minor) geomagnetic storm conditions on Jan. 24 with effects comparable to those mentioned above. Isolated category R1 (minor) radio blackouts will be possible during the period as well, with effects similar to those mentioned above.

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.