DME (Direct Measurement Explorer)
Also known as Explorer 31; it was launched
together with the Canadian Alouette 2.
The double-launch project, known as ISIS-X,
was the first in a new cooperative NASA-Canadian Defense Research Board
program for International Satellites for Ionospheric Studies. DME was placed
in an orbit with an apogee (highest point) slightly higher than Alouette's
and a perigee (lowest point) slightly lower. Eight ionospheric experiments
sampled the environment both ahead and behind the satellite.
||Nov. 28, 1965
||Vandenberg Air Force Base
||502 × 2,857 km × 79.8°
AND SPACE PROBES