THEMIS (Time History of Events and Macroscale Interaction during Substorms)
A future NASA MIDEX mission to study the onset of magnetic storms known as substorms within the tail of Earth’s magnetosphere. It will involve five microsatellite probes flying through different regions of the magnetosphere and observing how the storms originate and evolve. Led by Vassilis Angelopoulos of the University of California, Berkeley, THEMIS is scheduled for launch in October 2006.