2.2.9 spase://SMWG/Observatory/S3-3 S3-3 SESP S74-2A SS74-2A S74-2 09007 2018-03-30T14:12:05Z This spacecraft was a small observatory in a near-polar orbit with eight different sensors on board. It was designed to observe various magnetospheric parameters and their interrelationships. Sensors, which observed energetic protons and Alpha particles, also provided real-time observations for use by the U.S. Air Force Air Weather Service. spase://SMWG/Person/T.Paul.OBrien GeneralContact Earth.Magnetosphere.Polar 1976-07-08T00:00:00Z 1979-04-25T00:00:00Z