NOAA SEC Space Weather Outlook #01-48 -- 27 Nov 2001

Status Report From: Space Weather Prediction Center (NOAA)
Posted: Tuesday, November 27, 2001

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

2001 November 27 at 02:12 p.m. MST (2001 November 27 2112 UT)


Summary For November 19-25

Space weather increased to severe levels due to geomagnetic and solar radiation storms. A category S1 (minor) solar radiation storm was in progress as the period began, then ended on November 20. A category S4 (severe) solar radiation storm began on November 22 and continued through the end of the period. This storm was caused by a major solar flare that reached its peak at 4:30 p.m. MST on November 22 (2001 November 22 2330 UT). This flare also caused a category R2 (moderate) radio blackout as well as an Earth-directed coronal mass ejection (CME). This CME reached Earth on November 24 and caused a category G4 (severe) geomagnetic storm. A category R3 (strong) radio blackout occurred at 2:51 a.m. MST on November 25 (2001 November 25 0951 UT) due to a major solar flare. For a list of adverse system effects related to space weather storms, please refer to the NOAA Space Weather Scales.

Outlook For November 28-December 4

Space weather is expected to decrease to mostly minor levels. Isolated category R1 (minor) radio blackouts are expected. However, there will also be a slight chance for an isolated category R2 (moderate) radio blackout sometime during the period. No geomagnetic or solar radiation storms are expected.

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 or (303) 497-5127. The NOAA Public Affairs contact is Barbara McGehan at or (303) 497-6288.

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