A large and moderately complex sunspot group, NOAA Region696, wasresponsible for a series of eruptions on the surface of theSun knownas solar flares, including a significant eruption on 7November 2004 at9:06 a.m. MST. A radiation storm, currently at the moderate(S2)level, began soon after the eruption was observed on theSun. Solarflare activity over the past few days has resulted in aseries ofEarth-directed coronal mass ejections (CMEs) that haveimpacted Earth’sgeomagnetic field with severe (G4) geomagnetic storming. Today’s largeeruption on the Sun may produce further periods of stronggeomagneticstorming on 9-10 November.

Agencies impacted by geomagnetic storms and radiation storms mayexperience disruptions in the next 48 hours. These includespacecraftoperations, electric power systems, HF communications, andelectronicnavigation systems.

Data used to provide space weather services are contributedby NOAA, USAF, NASA, NSF, USGS, the International Space EnvironmentServices and other observatories, universities, and institutions. Formore information, including email services, see SEC’s Space Weather Advisories Web site NOAAAdvisories.

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