NOAA SEC Space Weather Outlook #01-40 — 2 Oct 2001

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

SPACE WEATHER OUTLOOK #01- 40

2001 October 02 at 02:45 p.m. MDT (2001 October 02 2045 UT)

**** SPACE WEATHER OUTLOOK ****

Summary For September 24-30

Space weather increased to severe levels during the period. A category
S4 (severe) solar radiation storm occurred during September 24 – 30.
This radiation storm was caused by a major solar flare that occurred at
4:38 MDT on September 24 (2001 September 24 1038 UT). This flare also
caused a category R3 (strong) radio blackout. Another major flare
caused a category R2 (moderate) radio blackout at 4:27 a.m. on
September 25 (2001 September 25 1027 UT). Isolated category R1 (minor)
radio blackouts occurred daily. A category G2 (moderate) geomagnetic
storm occurred on September 25 due to a CME passage. Category G1
(minor) geomagnetic storm conditions were observed on September 26 and
29, also due to CME passages at Earth. For a list of adverse system
effects associated with space weather activity, please refer to the
NOAA Space Weather Scales.

Outlook For October 3-9

Space weather is expected to decrease to mostly minor levels with a
decreasing trend predicted during the latter half of the period.
However, there will be a slight chance for an isolated category R2
(moderate) radio blackout early in the period. Otherwise, isolated
category R1 (minor) radio blackouts are expected. There will also be a
slight chance for a category S1 (minor) solar radiation storm early in
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.