2.2.2 spase://SMWG/Instrument/MarsExpress/ASPERA3/ELS Mars Express ASPERA-3 Electron Spectrometer 2019-05-05T12:34:56Z The Electron Spectrometer (ELS) of the ASPERA-3 package flown on Mars Express measures electrons in the energy range 0.01-20 keV. The intrinsic field of view is 10 deg x 360 deg. The 360 deg aperture is divided into 16 sectors. The sensor is a standard top-hat electrostatic analyzer in a very compact design. spase://SMWG/Person/Rickard.Lundin PrincipalInvestigator PDS ASPERA web page http://pds-geosciences.wustl.edu/missions/mars_express/aspera.htm RetardingPotentialAnalyser ASPERA3_ELS spase://SMWG/Observatory/MarsExpress