Journal
SPACE SCIENCE REVIEWS
Volume 200, Issue 1-4, Pages 495-528Publisher
SPRINGER
DOI: 10.1007/s11214-015-0232-1
Keywords
Mars; Ionosphere; Solar wind; MAVEN mission; Electrostatic analyzer
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The MAVEN Solar Wind Electron Analyzer (SWEA) is a symmetric hemispheric electrostatic analyzer with deflectors that is designed to measure the energy and angular distributions of 3-4600-eV electrons in the Mars environment. This energy range is important for impact ionization of planetary atmospheric species, and encompasses the solar wind core and halo populations, shock-energized electrons, auroral electrons, and ionospheric primary photoelectrons. The instrument is mounted at the end of a 1.5-meter boom to provide a clear field of view that spans nearly 80 % of the sky with similar to 20A degrees resolution. With an energy resolution of 17 % (), SWEA readily distinguishes electrons of solar wind and ionospheric origin. Combined with a 2-second measurement cadence and on-board real-time pitch angle mapping, SWEA determines magnetic topology with high (similar to 8-km) spatial resolution, so that local measurements of the plasma and magnetic field can be placed into global context.
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