2.2.0 spase://SMWG/Observatory/SME SME 2019-05-05T12:34:56Z NASA's Solar Mesospheric Explorer (SME) spacecraft was launched on 1981-10-06 into a sun-synchronous orbit for studies of mesospheric ozone and its response to solar UV flux, and related topics. It operated until its December 2008 deactivation spase://SMWG/Person/Dieter.K.Bilitza GeneralContact NSSDC Master Catalog https://nssdc.gsfc.nasa.gov/nmc/spacecraft/display.action?id=1981-100A Earth.NearSurface