Explorer 20

Explorer 20, also known Ionosphere Explorer IE-A, Ionosphere 2, Science S-48, Topside-sounder TOPSI and Beacon Explorer BE-A, was an American satellite launched as part of Explorers program. Its purpose was two-fold: long-term investigation of the ionosphere from above, and in situ investigation of ion concentrations and temperatures.

Explorer 20

Explorer 20, also known Ionosphere Explorer IE-A, Ionosphere 2, Science S-48, Topside-sounder TOPSI and Beacon Explorer BE-A, was an American satellite launched as part of Explorers program. Its purpose was two-fold: long-term investigation of the ionosphere from above, and in situ investigation of ion concentrations and temperatures.