Increase in Solar and Geomagnetic Activity

Increase in Solar and Geomagnetic Activity

A solar flare that erupted on the Sun early Sunday morning resulted in a coronal mass ejection (CME) directed toward the earth.  The CME arrived here Midday Tuesday, kicking off a small geomagnetic storm.  Only minor radio impacts have been noted, although there will be enhanced auroral activity over the next few days at northern latitudes, mainly north of the Contiguous U.S.



On Sunday August 1, 2010 a small solar flare erupted on the Sun at about 4 am EDT.  Associated with this flare was a coronal mass ejection (CME) that was directed towards the Earth, moving at approximately 2.5 million miles an hour. 

As defined, a coronal mass ejection is an outflow of plasma from or through the solar corona. CMEs are often, but not always, associated with erupting prominences, disappearing solar filaments, and/or flares.  CMEs vary widely in structure, density, and velocity.  Earth impacting CMEs can result in significant geomagnetic storms.

As predicted by the NOAA National Weather Service (NWS) Space Weather Prediction Center (SWPC) in Boulder, Colorado, this CME arrived at Earth on Tuesday, August 3 at 12:41 pm EDT, kicking off a small geomagnetic storm.

This geomagnetic activity is expected to continue at least two  more days as this event winds down and then Earth is hit with another coronal mass ejection.  The SWPC forecast is calling for activity to be strongest on Thursday, August 5.


No significant reports have been received, although there were some reports of amateur (ham) and CB radio signal disruption, which are typical of what is expected even from minor geomagnetic storms.

An increase in auroral activity is expected for northern latitudes for the next few days, including in Alaska and Canada.  There are very low probabilities of aurora being visible over the next two to three nights across the far northern tier of the contiguous states, including New England, upstate New York, Michigan, Wisconsin, Minnesota, North Dakota, South Dakota, Montana, northern  Idaho and Washington state.  Tips on viewing the aurora can be found at .

Click below for  Space Weather Prediction Center (SWPC) websites of interest
Space Weather Now - gives a layman's overview of current solar activity and space weather
Today's Space Weather - gives a more technical look at current solar activity and space weather
Auroral activity extrapolated from NOAA Polar Orbiting Satellites

See also:

A press release from the Harvard Smithsonian Center for Astrophysics in Cambridge, Massachusetts, which uses the NASA Solar Dynamics Observatory to observe the solar activity. 

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