MARS-96     ROBOTIC SPACECRAFT MISSION TO MARS. Brief description
Table of contents
Inroduction
Scientific goals
Scheme of the mission
Spacecraft
Orbiter
Payload of the Orbiter
Scientific goals of
the experiments
Description of
the instruments
Small Stations
Penetrators
Conclusion
 Experiment: ASPERA

ENERGY-MASS ION SPECTROGRAPH AND NEUTRAL-PARTICLE IMAGER

MEASUREMENTS OF ENERGY AND MASS SPECTRA OF IONS AND NEUTRALS NEAR MARS

Main scientific objectives - interaction between the plasma and neutrals near Mars; plasma ion composition.

ASPERA-S consists of:

  • Ion Mass Imaging Spectrograph (IMIS); an electrostatic "top hat" analyzer; particles are detected by "imaging" sensor using a microchannel plate assembly with position sensitive anodes, 32 x 32 (angle x mass) matrix.
  • Neutral Particle Imager (NPI):
    NPI-1, SSD, record neutral atoms.
    NPI-2, LiF, record secondary ions and electrons generated by neutral particles (LiF target ). An electrostatic filter deflects charged particles with E < 300 keV/q.

  • Scanner platform ( 90°), provides full coverage within 4 п solid



    • Main characteristics
     IMISNPI
              SSDLiF
    Energy range0.5-50,000eV5 - 300 KeV 10 eV
    Energy resolution0.070,36 <1
    Angular resolution5x11,35 x 5 5 x 5
    Field of view, degree 5 x 3605 x 3205 x 360
    Convers factor
    (cm 2 ·ster keV/kev )     		10-43x10-4 3x10-4
    Mass range (a.m.u.)1 - 10121 - 102 (SSD) 1 - 1012
    Mass resolution1.3 - 6.4 (hot)
    4.0 - 30 (cold)     		<1 <1
    Counting rate ( s -1 )0,1 - 1060,001 - 105 0,001 - 105
    Масса 12,2 кг




    A part of the transmission spectrum of the terrestrial atmosphere measured by the PFS flight model in laboratory (one of the H2O bands). The path in the air was 0.5 m.


    Cooperation: : Sweden, Russia, Finland, Poland, USA, Norway, Germany.

    Contact persons:R.Lundin (PI) rickard@irf.se, N.Pisarenko mira@ares.iki.rssi.ru,
     A.Zakharov zakharov@mx.iki.rssi.ru
     E.Dubinin edik@ares.iki.rssi.ru



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