Atmospheres Team Report

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Atmospheres Team Report

• Assigned Working Issues
• 1) ALICE Bandpass
• 2) REX Stability
• 3) MVIC Filter Requirements

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Atmospheres Team Report

• 1) ALICE
• i) Bandpass
• bandpass is nominally 50-185nm
• we will tweak this to 52-187nm in order to keep
  zero-order light out of detector
• there is no science hit, since Aeff at the short
  wavelength end is very small and the nearest
  important emission line is OII 53.9nm
• action to RG to check total count rate expected
  from the Sun at 32AU (must be 1e4-2e4 cps)

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Atmospheres Team Report

• 1) ALICE (contd)
• ii) Ly? Bandgap
• bandgap is nominally 3nm
• we will tweak this to 5nm to make fabrication
  easier (it is difficult and tedious to center Ly?
  in the gap)
• there is a minor science hit, since the NI
  120.0nm is now unobservable (although it was
  already doubtful) - the slightly fainter NI
  113.4nm emission will cover
• action to RG to check local count rate expected
  from the solar Ly? at 32AU (must be lt100
  cps/pixel)

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Atmospheres Team Report

• 1) ALICE (contd)
• iii) Slit shape
• slit shape is nominally 0.1º6.0º
• no need to tweak this, as it provides 1.0-1.2nm
  dayglow and 0.5-0.6nm solar occultation
  resolution
• action to LY to check dead band of star tracker
  pointing corrections to make sure we can correct
  for motion of Sun in the slit after data is on
  the ground
• action to DS to firm up design of SOC pickoff
  mirror, especially w.r.t. field of view
  requirement
• action to DS to investigate possible glint into
  SOC aperture from, e.g., edge of the dish

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Atmospheres Team Report

• 2) REX
• i) Stability Requirements
• if f/?f gt 8e-14 (the proposed value) then the
  extracted pressure and temperature profiles will
  be more uncertain
• action to DH to quantify this

• 3) MVIC
• i) Filter Requirements
• no filter requirements from the ATM team (we are
  most interested in clear images at high phase
  angle for haze searches)

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Atmospheric Science at Jupiter

• 1) ALICE
• neutral O and S emissions from near-Io aurora
• synoptic observations of Io Plasma Torus (IPT)
  and jovian aurora, to be cross correlated with
  SWAP solar wind measurements
• both of the above in concert with JMEX (cross
  calibration day/night comparison of UV aurora)
• stellar occultations, if possible!

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Atmospheric Science at Jupiter

• 2) REX (contact Scott Bolton)
• raster (or spiral) of Jupiter thermal and
  synchrotron radio emissions, in order to
  calibrate radiometry experiment at Pluto (1hr
  near C/A)
• a 10hr observations of the synchrotron emissions
  would provide useful science (and E/PO)

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Atmospheric Science at Jupiter

• 3) LEISA (contact Kevin Baines)
• movies of Great Red Spot (GRS) region would
  provide best ever resolution (2 spatial, 2
  spectral) in near-IR, e.g., look for growth and
  decay of NH3 ice cloud absorption feature
• night side (outbound) observations of H3 aurora
  and lightning
• phase function studies of various atmospheric
  features (e.g., GRS, white oval)
• concern for DSN requirements, faster spin rate to
  account for Jupiter brightness relative to Pluto

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Atmospheric Science at Jupiter

• 4) MVIC and LORRI
• movies of cloud features to get zonal winds, etc.
• night side (outbound) observations of visible
  aurora and lightning