LPSC Notes Part Two

After some delay, here is the second half of my notes from LPSC:

• Cassini RADAR
  • Radiometry
    • not an iceball
    • dielectric constant ~ 2.1
    • a lot going on
    • N-S gradient, 2.1 in north, 1.6 in south
    • organic material ~ 2-3
  • Scatterometry Ta inbound
    • multiple populations of terrain types
    • coorelate w/ optical albedo
    • optically dark -> radar dark -> warmer
    • optically bright -> radar bright -> cooler
  • High resolution radiometry
    • bland dark - higher brightness temperature
    • argues for importance of volume scattering role of organic contaminents
    • Xanadu - mottled
  • RADAR dark features in plains - smooth, localized
    • kitty head - 56W, 50N
    • west ponds in Ta - 124W, 37N
  • Ganesa Macula
    • cryovolcanic dome akin to pancake domes on Venus
    • degraded topography along margins
    • deltas connected to bright lines
    • rough center - pit
  • Cryovolcanic features - 43W, 49N, 40 km caldera
• VIMS - Bob Brown
  • Phoebe
    • compositionally diverse
    • water everywhere (bound or free)
    • ferrous iron
    • 2.2 micron absorption - cyanides
    • 3.3 micron absorption - C-H organics
    • CO2 - complex inclusion in minerals - found in dark materials
    • a bit more ice at the poles
  • Titan
    • emission at 1500 km - atmosphere more extended than once thought
    • snail - geology from VIMS possible
• CIRS
  • Detected species - CO, N2, CH4, C3H4, H2, C4H2, CO2, C2H2, C2H6, C2H4, CH3D
  • Stratosphere - 310 km - max temp
  • upwelling at southern latitudes w/ adiabatic cooling
  • circumpolar vortex in north - high winds in north
  • wind jets change with seasons
  • zonal variations in temperature weak
  • HCN seen at high northern latitudes
  • CO2 disappears as you move north
  • CO2 increases with depth
  • winter polar atmosphere isolated - akin to terrestrial ozone hole
  • strongest winds 160 m/s at 20-40N
  • summer pole 5K colder than equator in the stratosphere
    
  • CO stratospheric mole fraction 4.5 +/- 1.5 x 10-5
  • CH4 mole fraction in statosphere 1.6 +/- 0.5 x 10-2
• UVIS
  • Instruments
    FarUV (110-190 nm)
    • EUV (55-110 nm, solar occultations as well
    • High speed photometer
    • HDAP (D/H ratio)
  • Tb Stellar Occultations
    • Lambda Sco + Spica
    • vertical profile of constituents
    • Lambda Sco - 36 South Latitude
    • CH4, N2, C2H2, C2H4, C2H6, HCN, C4H2
  • Tmin - 114 K near 615 km
  • Phoebe
    • H2O, CO2, frosts contribute to Phoebe' FUV spectrum
    • latitudinal variations
    • no emissions (not Chiron)
    • very dark <>
  • ion composition
    • No N+ near Titan
    • maybe it comes from icy satellites
    • O2 atmosphere over rings
    • H2/O2 loss rate ~10
• Magnetometer
  • magnetospheric interaction with Enceladus similar to Io and Jupiter
  • Saturn's magnetic field is being bent around moon
  • either very dense atmosphere or higher production of ions
  • wave activity H2O+ - Alfven wing
  • 2 Re extent
  • no firm density number
• Aerosol and Cloud Properties from DISR
  • 8 particles/cm3 rather uniform assumes 256 monomers/particle and 0.05 micron monomer size
  • HRI images with lamp on - backscatter off haze
  • optical depth @ 830 nm @ surface 1.5
  • optical depth @ 531 nm @ surface - 6
  • aerosols larger than thought
  • aerosols extend to the ground