Contact: Susan Hendrix
NASA/Goddard Space Flight Center
Caption: When high frequency radio waves, such as those used for the Global Positioning System travel through a disturbed layer of Earth's electrically charged atmosphere, the ionosphere, they can be disrupted. A sounding rocket mission called EVEX (Equatorial Vortex Experiment) launching in Spring 2013 will search for answers to what disturbs the ionosphere.
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Related news release: NASA mission to study what disrupts radio waves