Dynamics Explorer twins



Two spacecraft that will ride piggyback into orbit next July are currently undergoing vigorous prelaunch testing at the Goddard Space Flight Center, Greenbelt, Md. Called Dynamics Explorer (DE)-A and -B, the twin satellites are scheduled to be stacked together and placed into coplanar polar orbits by a Delta 3913 launch vehicle from the Western Space and Missile Center, Lompoc, Calif., on July 31.

Their mission will be to explore the boundary region between Earth and space that affects the atmosphere, auroral displays, radio transmissons, and perhaps climate and weather. Solar radiation and the solar wind have a dynamic impact on the near-Earth environment, the results of which affect the state of the atmosphere, ionosphere, magnetosphere, and the more familiar phenomena—weather, auroral displays, and radio disturbances.