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Solar Energetic Particle (SEP)

NSSDCA ID: 2013-063A-05

Mission Name: Mars Atmosphere and Volatile EvolutioN (MAVEN)
Principal Investigator:Mr. Davin Larson


The Solar Energetic Particle (SEP) instrument will characterize the relationship between solar energetic partical events and martian atmospheric escape. The SEP measures the energy and angular distribution of energetic protons and electrons in the energy range absorbed by the upper atmosphere. The main instrument comprises two orthogonal dual double-ended solid state telescopes with passive ion-implanted silicon detectors, giving it four look directions.

The SEP can measure proton energies from 25 keV to 6 MeV and electrons from 25 keV to 1 MeV. It can measure particle fluxes from 20 to 107 per cm2 s sr. It has three measurement frequencies depending on orbital distance from the surface: once every two seconds below 300 km, 8 seconds from 300 to 800 km, and 32 seconds beyond 800 km.

Image courtesy NASA/GSFC/SSL

Alternate Names


    • Planetary Science: Fields and Particles

    Additional Information

    Questions and comments about this experiment can be directed to: Dr. David R. Williams



    NameRoleOriginal AffiliationE-mail
    Mr. Davin LarsonLead InvestigatorUniversity of California,
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