NASA's Equatorial Vortex Experiment Will Search for Reasons of Disruption (image) NASA/Goddard Space Flight Center Share Print E-Mail 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. Credit AFRL Usage Restrictions None Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.