NOAA SEC Space Weather Advisory Bulletin #04- 2

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

SPACE WEATHER ADVISORY BULLETIN #04- 2

2004 November 07 at 06:35 p.m. MST (2004 November 08 0135 UTC)

A large and moderately complex sunspot group, NOAA Region 696, was
responsible for a series of eruptions on the surface of the Sun known
as solar flares, including a significant eruption on 7 November 2004 at
9:06 a.m. MST. A radiation storm, currently at the moderate (S2)
level, began soon after the eruption was observed on the Sun. Solar
flare activity over the past few days has resulted in a series of
Earth-directed coronal mass ejections (CMEs) that have impacted Earth’s
geomagnetic field with severe (G4) geomagnetic storming. Today’s large
eruption on the Sun may produce further periods of strong geomagnetic
storming on 9-10 November.

Agencies impacted by geomagnetic storms and radiation storms may
experience disruptions in the next 48 hours. These include spacecraft
operations, electric power systems, HF communications, and electronic
navigation systems.

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 http://sec.noaa.gov/advisories or (303) 497-5127.