Sites

Exploration of the Earth's Magnetosphere (Popularity: )
http://www.phy6.org/Education/Intro.html
an overview of space research on the Earth's environment in space: the polar aurora, the radiation belts, the solar wind, magnetic storms, and more.

Imager for Magnetopause-to-Aurora Global Exploration (Popularity: )
http://image.gsfc.nasa.gov/
studying the response of Earth's magnetosphere to changes in the solar wind, producing images of the magnetosphere from neutral atom and radio observations.

Magnetosphere Ionosphere and Solar-Terrestrial (MIST) (Popularity: )
http://www.nerc-bas.ac.uk/public/uasd/mist.html
informal community of UK-based scientists who study the ionosphere and magnetosphere and the ionised space in the vicinity of Earth, and solar-terrestrial relations.

The Magnetosphere (Popularity: )
http://ssdoo.gsfc.nasa.gov/education/lectures/magnetosphere.html
describes the region just above the ionosphere.