We cannot always expect that satellite anomalies occur immediately as the magnetic activity becomes very active.
Some of that complexity shows up in what we call sunspots, which are dense pockets of magnetic activity that appear during the more active periods in the sun's 11-year activity cycle.
Sunspot, vortex of gas on the surface of the Sun associated with strong local magnetic activity.
Always a highly intuitive scientist, Birkeland had a hunch that the phenomenon was linked not to the earth's atmosphere but to the sun's magnetic activity -- specifically, he later found, to sunspots.
Astronomers have indirectly detected magnetic activity associated with other stars.
The irregularity oval expands equatorward with increased magnetic activity.
Canadian array for realtime investigations of magnetic activity.
GTL data and ground magnetic activity on March 7 , 1999
Sunspots look like dark freckles on the sun, but they're actually regions of intense magnetic activity.
Sunspots are areas of intense magnetic activity on the solar surface.
We set up AuroraWatch, so people can be alerted to magnetic activity.
