Status Report

NOAA SEC Space Weather Advisory Bulletin #05-2

By SpaceRef Editor
January 17, 2005
Filed under , ,
NOAA SEC Space Weather Advisory Bulletin #05-2

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


2005 January 17 at 12:37 p.m. MST (2005 January 17 1937 UTC)


The large and dynamic active sunspot region, numbered by NOAA as Region
720, has produced several strong solar events. Five large solar flares
produced moderate (R2) to strong (R3) radio blackouts since 15 January.
The largest of these solar eruptions, an X3.8 on the GOES-12 x-ray
sensor, occurred today at 17/0659 UTC (near local midnight MST).
Short-wave radio communications through the sunlit hemisphere of Earth
experienced significant signal degradation during these solar flares.

Associated strong geomagnetic and radiation storms are underway. The
radiation storm began on 16/0210 UTC (15 January, 7:10 P.M. MST) and is
currently at the S3 (strong level). A G3 (strong) geomagnetic storm
began early on the 17th (UTC) and remains in progress. The geomagnetic
storm is associated with two coronal mass ejections (CMEs) observed on
SOHO/LASCO imagery on 15 January.

A third Earth-directed CME was observed today following the X3.8 flare.
This CME is expected to impact the geomagnetic field on 17 and 18
January with strong (G3) to severe (G4) geomagnetic storm levels. The
radiation storm in progress now is expected to continue for several
more days.

Active Region 720 is a large and complex sunspot cluster. Further major
eruptions are possible from this region before it rotates around the
visible solar disk on 22 January. Agencies impacted by solar flare
radio blackouts, geomagnetic storms, and solar radiation storms should
continue to closely monitor the space environment through the remainder
of this week.

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.