The Solar Wind Electron Analyzer (SWEA) is a symmetric, hemispheric electrostatic analyzer
         designed to measure the energy and angular distributions of solar wind electrons and ionospheric
         photoelectrons in the Mars environment. The instrument is a collaboration between the Space 
         Sciences Laboratory at the University of California, Berkeley (UCB-SSL) and the Institut de 
         Recherche en Astrophysique et Planétologie (IRAP) in Toulouse, France. SWEA is closely based on 
         two instruments of the same name currently operating on the twin STEREO spacecraft.