Earth, Lunar and Planetary Environments Session D

1
Earth, Lunar and Planetary Environments (Session
D)

• Key questions
• -What we know
• -What we dont know (and need to know for VSE)
• -How do we address the above?
• For
• -Earth environment
• -Lunar Orbit and Surface
• -Mars Orbit and Surface

2
Earth, Lunar and Planetary Environments-Earth
Environment Issues Outline
WHAT WE KNOW
WHAT WE DONT KNOW (AND NEED TO KNOW)

• Radiation Belts
• -LEO and GEO models
• -Observational archives
• -COSPAR reference list
• Plasma Environment
• -Observational Archives
• -spacecraft charging models
• Upper atmosphere, ionos.
• -var. statistical models
• -Observational archives

• Rad Belts, Plasma, Atmos,Ionos
• -dynamical models (validated)
• -extremes models and predictive models (incl.
  heavy ions)
• HOW DO WE ADDRESS THE ABOVE?
• Data resource mining tools
• Model-targeted missions (e.g. LWS RBMP, ITMP),
  with continued L1 monitor
• dynamical/extremes model devel., coupled system
  models devel.

3
Earth, Lunar and Planetary Environments-Lunar
Orbit and Surface Issues Outline
WHAT WE KNOW
WHAT WE DONT KNOW (AND NEED TO KNOW)

• Mission results from
• -Explorer 35 and Apollo (data lost? docs only on
  SEP events and event shadows, dosimetry from
  Apollo, mag fields, dust, meteors)
• -Clementine (SEP events and shadows, dosimetry,
  surface composition-data are limited, access not
  gen. open)
• -Lunar Prospector (SEP events in ER backgrounds,
  shadowing, mag fields, surface composition,
  neutrons, alphas)
• -Geotail (SEP events below a few MeV in transits
  of Lunar orbit)
• -WIND (few flybys- plasmas, mag fields)
• Models- surface neutrons based on measured
  surface composition

• How different is lunar space environment from
  interplanetary?
• Comprehensive lunar surface environment
  measurements and models
• Details of surface composition
• Need to revisit lessons learned from
• Expl. 35, Apollo, Clementine
• Relevant data sets restoration and mining
• LRO and dedicated lunar space environment
  orbiter
• Lunar Lander measurements of radiation, dust,
  micrometeorites, E fields/surfaces charging,
  gases
• Solar wind/Sheath/Magnetosphere Interaction with
  Moon models
• Samples for rad history analysis

HOW DO WE ADDRESS THE ABOVE?
4
Session D Meeting Plans

• Today (Tues) PM session- outline/discussion of
  Mars orbit and surface environment and other
  planets and asteroids environments issues
• Wed- brief presentations aimed toward the 3 key
  questions from session participants, discussion,
  and draft report/input for steering committee
  any desired combined session splinters
• Earth Rad belts (Reeves), Earth Upper
  Atmosphere (Lu, Woods), LRO (Spence), surface
  neutrons (Clowdsley), Mars surface rad (Hassler),
  Lunar rad env (Lee), Lunar Electric
  fields/dust/charging (Guild, Delory), SEPs in
  Mars orbit env (Delory, Luhmann), Earth and Mars
  SEP predictions (Turner, Fry)