MAPSKP

The Magnetospheric Imaging Instrument (MIMI) will be used study the energetic charged particle enviroment of Saturn's space envirnment, or magnetosphere, using novel techniques . Charged particles are measured with energies between 7 keV/nucleon to > 152 MeV/ nucleon. It will obtain the first remote global images of Saturn's hot plasmas using the new technique of "Energetic Neutral Atom Imaging". It will also perform comprehensive in situ hot plasma measurements, including charge state, elemental compostion, and angular distrubutions. The new "Energetic Neutral Atom Imaging" technique utilized by MIMI will also allow the MIMI team to make sensitive measurments of the neutral exospheric densities of Titan, and possibly also of the icy satellites.

The MIMI Instumentation consists of a Main Electronics Unit MEU and the three sensor heads: The Low Energy Magnetosheric Measurment System, or LEMMS, the The Charge Energy Mass Spectrometer, or CHEMS, and The Ion and Neutral Camera , or INCA. The Low Energy Magnetospheric Measurment System (LEMMS) mesures high energy ion and electron energy and angular distributions from 20 keV to ~130 MeV. To obtain angular distributions it is mounted on a rotating platform which permits motor driven rotations of the sensor head by 360 deg. about the spacecraft -Y axis The CHarge Energy Mass Spectrometer (CHEMS), provided by the University of Maryland, measures the charge state, compostion, and energy of ions with energies between about 10 to 220 keV/charge. The Ion and Neutral Camera (INCA) images of the global distribution of energetic ions for energies from 7 keV/nucleon to 8 MeV/nucleon, discriminated according to energy and mass species (Oxygen and Hydrogen). To obtain these images INCA measures the arrival directions, energy, and mass species of Energetic Neutral Atoms (ENA's) using the new technique of ENA imaging.

The MIMI Key Parameter file contains minute averaged particle flux counts in the various detectors of the different sub-systems. The data files include: LEMMS channels A0-8, C0-7, P1-5, E0-4 and the calculated anisotropy for C5 and A5; CHEMS ion counts for H+, He+, He++, and O+ in four averaged energy bands; and INCA time-of-flight (TOF) counts in 7 channels averaged over the field of view for either ions or neutrals depending on the operating mode.