ISIS (International Satellites for Ionospheric Studies)
The first ISIS launch, known as ISIS-X, took place on Nov. 28, 1965, when NASA launched Alouette 2 and Explorer 31 (also known as Direct Measurement Explorer, or DME) from the Western Test Range with a single Thor-Agena B booster. The Canadian topside sounder and the U.S. DME were designed to complement each other's scientific data on the ionosphere. Both ISIS 1 and ISIS 2 were launched by Delta E rockets from Vandenberg Air Force Base and carried experiments to continue the cooperative investigation of the ionosphere. They took measurements over an entire 11-year solar cycle to determine how the ionosphere reacts to changes in the Sun's radiation.
In 1969 the Canadian government proposed the substitution of an experimental communications satellite for the last of the projected ISIS spacecraft (ISIS-C). The satellite was redesignated "CAS-C" – an acronym used by NASA to denote an international "Cooperative Applications Satellite." In April 1971 a memorandum of understanding was signed by NASA and the Canadian Department of Communication providing for the launch of CAS-C, which later was again redesignated CTS-A, an acronym for "Communications Technology Satellite." CTS-A was scheduled for 1975 launch.
Related category SATELLITES AND SPACE PROBES
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