The Artemis Mission
Language: English
Pages: 107
ISBN: 1493948547
Format: PDF / Kindle (mobi) / ePub
The ARTEMIS mission was initiated by skillfully moving the two outermost Earth-orbiting THEMIS spacecraft into lunar orbit to conduct unprecedented dual spacecraft observations of the lunar environment. ARTEMIS stands for Acceleration, Reconnection, Turbulence and Electrodynamics of the Moon's Interaction with the Sun. Indeed, this volume discusses initial findings related to the Moon s magnetic and plasma environments and the electrical conductivity of the lunar interior. This work is aimed at researchers and graduate students in both heliophysics and planetary physics. Originally published in Space Science Reviews, Vol. 165/1-4, 2011."
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the knowledge gained from prior studies of interactions of such anomalies with the solar wind. For example, ions (including reflected ions) will be measured, the waves from the ion-ion beam instabilities will be sensed in both electric and magnetic fields, and the spacecraft potential from the electric field instrument will be helpful in accurately determining the plasma moments. The high time resolution wave captures will be particularly important in the analysis of plasma waves and in further
any strongly conducting core to less than about 20% of the lunar radius (e.g, Sonett et al. 1972; Dyal et al. 1974; Hood et al. 1982; Hood and Sonett 1982). Laboratory conductivity-temperature measurements were used to translate the lunar conductivity profile to a selenotherm that is roughly equivalent with the background, global heat flow derived by Wieczorek et al. (2006). The outer 500 km was poorly constrained due to the limited magnetometer bandwidth (higher frequencies are needed to resolve
Reprinted from the journal V. Angelopoulos addresses key science questions related to both heliophysics science as observed from/at the lunar environment and the lunar exosphere, surface, and interior. The mission concept utilizes the two outermost satellites of the NASA MIDEX mission THEMIS (Angelopoulos 2008), a five identical satellite mission launched on 17 February 2007 to study the origin of the magnetospheric substorms, a fundamental space weather process (Sibeck and Angelopoulos 2008).
wave propagating back into the plasma, particle expansion into the vacuum with a velocity related to the ion sound speed, and an exponentially decreasing density on the vacuum side of the interface (Crow et al. 1975; Denavit 1979; Samir et al. 1983). Observations from Wind first demonstrated that this process operates to refill the lunar wake (Ogilvie et al. 1996; Clack et al. 2004), and numerous simulations have since refined our understanding (Farrell et al. 1998; Birch and Chapman 2001a,
for parallel (0–15◦ pitch angle) and anti-parallel (165–180◦ ) traveling electrons (high resolution burst data). The fifth and sixth panels show the wake potential relative to the solar wind, and the potential drop from the deepest point into the wake along the magnetic field line to the spacecraft, as inferred from shifts in electron distribution functions. Black curves on both panels indicate model potentials. The bottom two panels show synthetic spectrograms created using the inferred
