Isis 2

ISIS 2 was an ionospheric observatory instrumented with a sweep- and a fixed-frequency ionosonde, a VLF receiver, energetic and soft particle detectors, an ion mass spectrometer, an electrostatic probe, a retarding potential analyzer, a beacon transmitter, a cosmic noise experiment, and two photometers.

Associated launch

Thor Delta E1Success

Isis 2 · United States Air Force

Thursday, Apr 1, 1971, 02:57 UTC