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ARTEMIS Contributions to Planetary Exploration. THEMIS Extended Phase = THEMIS baseline + ARTEMIS Vassilis Angelopoulos, and the ARTEMIS team. Overview. THEMIS Extended Phase (FY10, FY11, FY12) Extended THEMIS Baseline (3 probes) + ARTEMIS (2 probes)
THEMIS Extended Phase
THEMIS baseline + ARTEMIS
Vassilis Angelopoulos, and the ARTEMIS team
ARTEMIS payload, operations concept
Data volume: 100Mbits/day
Orbit periods at moon: ~1 day
ESA: ElectroStatic Analyzer (i,e: 3eV-25keV; Carlson & McFadden)SST: Solid State Telescopes (i,e: 25-1000keV; Larson)FGM: FluxGate Magnetometer (0-128Hz; Glassmeier, Auster & Baumjohann)SCM: SearchCoil Magnetometer (1Hz-4kHz; Roux & LeContel)
EFI: Electric Field Instrument (0-8kHz; Bonnell & Mozer)
Insertion: FY10; Science: FY11,12
Insertion FY10; Science: FY11,12
FY10: Translunar injection
FY11-12: 6mo Lissajous + 18 mo Lunar
For purposes of addressing planetary objectives:Periselene of P1 can be lowered to 100km (P2 remains high)
Orbit stable for >3years; longer with little fuel
The Moon is an ideal plasma laboratory for studying magnetized plasmas.
The simple geometry of the Moon and its absorbing boundary produces a system that can be readily modeled with computers.
This allows the codes to be tested and the physics to be understood.
ARTEMIS measurements are particularly useful for such tests.
Apollo observers saw dust elevated above the lunar surface to possibly high altitudes.
LADEE will probably have a dust detector, but has no capability of measuring the solar wind electric and magnetic fields.
ARTEMIS measures the solar wind velocity, the interplanetary magnetic field and hence the solar wind electric field. It also can measure surface potentials with electron reflectometry.
ARTEMIS plus LADEE will enable us to determine the response of charged lunar dust to the lunar and solar wind electric fields.
ARTEMIS mass spectrometryof pickup ions assumed “protons”
Hartle et al., 2005
measured by Lunar
Prospector [Halekas et al. 2008]
Trace sputtered ions
back to lunar surface
Secondary and photo-electrons
accelerated from charged lunar surface
reveal regolith surface properties
Apollo orbital measurements provided evidence of an iron core of about 400 km radius.
Lunar Prospector made similar (single instrument) measurements and confirmed the Apollo subsatellite result.
Two-point measurements are needed to go beyond the current two-layer model of the interior electrical conductivity.
ARTEMIS will provide measurements of both the “exciting” field and the resulting induced magnetic field at about 100 km over a range of frequencies and sound the electrical conductivity profile above the core.
ARTEMIS consists of two well-instrumented spacecraft measuring the Moon’s plasma and magnetic environment.
ARTEMIS can determine
How dust is levitated
The interior electrical conductivity of the Moon
Whether the Moon has significant outgassing episodes
The effect of the exploration program on the lunar exosphere
The fundamental physical processes at work in a magnetized plasma
ARTEMIS is effectively a new mission with high science return at low cost
Can provide high value science return to the community