V. Payloads

At this moment, the resource of the payloads on the JMO is 25kg / 10W. It is highly limited, so we try to expand it. Anyway, in this chapter, we summarize the requirement to the payload package on the JMO. 'The Payload Definition Document for the JMO' will be established based on the requirement in this document.

V.1 Requirements to In-situ Instruments

V.1.1 Magnetometers

(Any inputs!)

  • Objectives : TBW
  • Spec (Minimum & Maximum) : TBW

V.1.2 Low Energy Plasma spectrometers

(Any inputs!)

  • Objectives : TBW
  • Spec (Minimum & Maximum) : TBW

V.1.3 Medium Energy particle detectors

(Any inputs!)

  • Objectives : TBW
  • Spec (Minimum & Maximum) : TBW

V.1.4 Energetic particle detectors

(Any inputs!)

  • Objectives : TBW
  • Spec (Minimum & Maximum) : TBW

V.1.5 Electric Field / Plasma Wave / Radio Wave (& Langmuir Probe)

(Any inputs!)

  • Objectives : TBW
  • Spec (Minimum & Maximum) : TBW

V.1.6 Dust Analyser

(Any inputs!)

  • Objectives : TBW
  • Spec (Minimum & Maximum) : TBW

V.2 Requirements to Remote-sensing Instruments

V.2.1 ENA Imager (Magnetospheric imaging)

OBJECTIVES

  • Determine how solar wind conditions affect magnetospheric dynamics: Obtain time sequences of global ENA images while sampling the solar wind dynamics pressure and magnetic field in-situ.
  • Determine global temporal and spatial characteristics of energetic ion injections: Obtain time sequences of global ENA images with ~30min resolution over ~10-200 keV for H. Are there large-scale injections, or many small-scale injections? Is there a local-time preference? Are injections periodic?
  • Assess the possible energization mechanisms: Study temporal response as function of composition, energy, and (if possible) pitch-angle distribution.
  • Determine the variability of energetic ion environment in which the Moons are immersed: Obtain statistics of the occurence rate, spatial evolution and intensity of energetic ion clouds impacting different Moons.
  • Determine the role of energetic ion pressure in distorting the magnetic field: Obtain global distribution for H+ and O+ in the ~10-200 keV range and estimate partial pressure and associated magnetic distortion and compare to in-situ measurements.

INSTRUMENT SPECIFICATIONS

  • Energy range: ~10-200 keV
  • Mass composition: Hydrogen and heavies (O and S separation under investigation)
  • Angular resolution: at least 5x5 deg
  • Field-of-view (FOV): 120x90 deg (instantaneous)
  • Geometrical Factor: ~0.003 cm2 sr per pixel (Gtotal=2.88 cm2 sr)
  • Power: ~5W
  • Mass: under investigation (shielding is being computed)
  • Dimensions: 50x40x40 cm

V.2.2 EUV spectrometer (Io Torus imaging)

(Any inputs!)

  • Objectives : TBW
  • Spec (Minimum & Maximum) : TBW

V.3 Options for the JMO

Instruments targetting Jupiter itself should be covered by JEO / JGO.

(Any inputs!)

  • UV (auroras etc.)
  • X-ray (auroras etc.)

V.4 Proposals

I think it would be necessary to fly a comprehensive magnetospheric payload which can do better and more than Galileo did. Galileo did not carry: 1) ENA imaging instrument 2) charge states of ions at keV to MeV range 3) mass spectrometer 4) full plasma wave package.

There might be more. In addition the time resolution was very limited because of the antenna failure. The particle instrument EPD has only 4-11 minute resolution. I think second resolution is highly disirable.

(Norbert Krupp : June 10 2008)

In addition to the classical magnetospheric in-situ package, it would be good to have an ENA medium/high energy imager (similar to Cassini MIMI/INCA or on IMAGE) as well as a Radio and Plasma Wave instrument with direction finding capabilities.

(Nicolas Andre, nandre AT rssd.esa.int : June 11 2008)


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Last-modified: 2008-06-18 (Wed) 14:25:39 (3500d)