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The MAVEN Solar Wind Electron Analyzer

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Abstract

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 ∼20° resolution. With an energy resolution of 17 % (\(\Delta E/E\)), 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 (∼8-km) spatial resolution, so that local measurements of the plasma and magnetic field can be placed into global context.

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Acknowledgements

The fabrication, testing, calibration, and operation of MAVEN SWEA has been supported in the United States by the NASA Mars Scout Program and in France by CNES. The authors thank the engineering and technical staffs at SSL and IRAP for their expertise, dedication, and hard work throughout the development of SWEA.

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Authors and Affiliations

  1. Space Sciences Laboratory, University of California, Berkeley, USA

    D. L. Mitchell, E. Taylor, D. Gordon, M. Robinson, S. Heavner, P. Turin, M. Diaz-Aguado, D. W. Curtis & R. P. Lin

  2. CNRS, Institut de Recherche en Astrophysique et Planétologie, Toulouse, France

    C. Mazelle, J.-A. Sauvaud, J.-J. Thocaven, J. Rouzaud, A. Fedorov, P. Rouger & D. Toublanc

  3. University Paul Sabatier, Toulouse, France

    C. Mazelle, J.-A. Sauvaud, J.-J. Thocaven, J. Rouzaud, A. Fedorov, P. Rouger & D. Toublanc

  4. Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, USA

    B. M. Jakosky

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  1. D. L. Mitchell
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  2. C. Mazelle
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Correspondence to D. L. Mitchell.

Additional information

Note by the editor: This paper was meant to be part of the topical volume on ‘The Mars Atmosphere and Volatile Evolution (MAVEN) Mission’, Volume 195, 2015, edited by C.T. Russell and B.M. Jakosky.

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Mitchell, D.L., Mazelle, C., Sauvaud, JA. et al. The MAVEN Solar Wind Electron Analyzer. Space Sci Rev 200, 495–528 (2016). https://doi.org/10.1007/s11214-015-0232-1

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