NOAA SEC Space Weather Outlook #01-43 — 23 Oct 2001

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

SPACE WEATHER OUTLOOK #01- 43

2001 October 23 at 02:53 p.m. MDT (2001 October 23 2053 UT)

**** SPACE WEATHER OUTLOOK ****

Summary For October 15-21

Space weather reached strong (category 3) levels during the latter half
of the period due to major solar flares and geomagnetic storms. Two
category R3 (strong) radio blackouts and one category R2 (moderate)
radio blackout occurred on October 19 due to major solar flares. A
brief category S1 (minor) solar radiation storm also occurred on
October 19 following the major flares. Earth-directed coronal mass
ejections (CME) followed the October 19 flares as well. Subsequent CME
passages at Earth caused geomagnetic storms during October 21 that
reached category G1 (minor) to G3 (strong) levels.

Outlook For October 24-30

Space weather is expected to range from minor to strong levels.
Geomagnetic storm conditions reaching category G1 – G3 levels are
expected during October 24 – 25 due to a CME passage. There will be a
fair chance for isolated category R2 – R3 radio blackouts during the
period. There will also be a fair chance for a category S1 solar
radiation storm during the period.

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.