The objectives of this investigation are to study the energy, charge, and mass spectra of energetic
charged particles (both electrons and nuclei) in interplanetary space in the energy range from (for protons) approximately 0.5 MeV/nucleon to
approximately 100 MeV/nucleon with high resolution, extending to the order of 1 GeV with more basic low resolution measurements of flux and/or intensity; and to study spatial gradients and the propagation of charged particles throughout the
heliosphere by measuring absolute flux and vector anisotropy. COSPIN consists of a suite of five seperate instruments,
each targeted at a distinct population of particles in the cosmic radiation. All telescopes share a common power supply
and interface to the spacecraft telemetry system through a common Data Processing Unit. COSPIN consists of:

    Low Energy Telescope (LET): ~1-20 MeV/n P, He, and heavier nuclei using a dE/dx vs. E telescope with pha capability
   
    Anisotropy Telescopes (ATs): ~0.7-7 MeV/n P and He with telescopes oriented in two directions with respect to
    the spin axis to provide 3-dimensional anisotropy information
   
    High Flux Telescope (HFT): ~0.3-7 MeV protons, 0.4-4 MeV/n He with a small aperture single detector telescope for use in
    very high flux situations
   
    High Energy Telescope (HET): ~10-90 MeV/n P, He, and heavier nuclei with same range, and also ~3-10 MeV electrons using a large
    geometry factor high resolution dE/dx vs. E and trajectory determining telescope with pha capability optimized for studies of the chemical and isotopic abundances in the cosmic radiation
   
    Kiel Electron Telescope (KET): ~3-200 MeV electrons and ~3-2100 MeV/n protons and He using a Large dE/dx vs. E and cerenkov telescope
    with pha capability optimized for studies of high energy electrons, protons, and helium.