Status Report

NOAA SEC Space Weather Advisory Bulletin #05-4

By SpaceRef Editor
January 25, 2005
Filed under , ,

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

2005 January 25 at 02:22 p.m. MST (2005 January 25 2122 UTC)


Summary For January 17-23

A series of major flares from Region 720 produced numerous minor to
strong radio blackouts and other related effects during the summary
period. Category R1 (minor) radio blackouts occurred on 17 – 19, 21,
and 23 January; category R2 (moderate) radio blackouts occurred on 19
January; and category R3 (strong) radio blackouts occurred on 17, 19,
and 20 January, all due to significant solar flare activity from active
sunspot Region 720. A category S3 (strong) solar radiation storm began
on 17 January. This radiation storm declined to S1 (minor) levels by
early on 20 January, when a second category S3 solar radiation storm
began. This solar radiation storm ended on 22 January and was the most
energetic solar radiation storm since October 1989. Category G1
(minor) geomagnetic storms occurred on 17 – 18 January; category G2
(moderate) geomagnetic storms occurred on 18 – 19 and 21 – 22 January;
category G3 (strong) geomagnetic storms occurred on 17 – 19 January;
and category G4 (severe) geomagnetic storms occurred on 21 January, all
due to clouds of magnetic material from solar flares on the Sun that
impacted Earth.

Outlook For January 26-February 1

The large active region that produced last week’s solar storms has
rotated around the west limb of the Sun and is no longer visible.
Therefore, there is only a chance for category G1 (minor) geomagnetic
storms due to high speed solar winds from a coronal hole on the Sun.

For current space weather conditions please refer to:

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. For more
information, including email services, see SEC’s Space Weather
Advisories Web site or (303) 497-5127.

SpaceRef staff editor.