국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	First Results from ARTEMIS, a New Two-Spacecraft Lunar Mission: Counter-Streaming Plasma Populations in the Lunar Wake
저자	Halekas, J. S.;; Angelopoulos, V.;; Sibeck, D. G.;; Khurana, K. K.;; Russell, C. T.;; Delory, G. T.;; Farrell, W. M.;; McFadden, J. P.;; Bonnell, J. W.;; Larson, D.;; Ergun, R. E.;; Plaschke, F.;; Glassmeier, K. H.
Keyword	CHARGED PARTICLES;; LUNAR ATMOSPHERE;; LUNAR ENVIRONMENT;; LUNAR PROBES;; MAGNETIC FIELDS;; MOON;; PLASMAS (PHYSICS); SATELLITE CONSTELLATIONS
URL	http://hdl.handle.net/2060/20110022965
보고서번호	GSFC.JA.5147.2011
발행년도	2011
출처	NTRS (NASA Technical Report Server)
ABSTRACT	We present observations from the first passage through the lunar plasma wake by one of two spacecraft comprising ARTEMIS (Acceleration, Reconnection, Turbulence, and Electrodynamics of the Moon''s Interaction with the Sun), a new lunar mission that re-tasks two of five probes from the THEMIS magnetospheric mission. On Feb 13, 2010, ARTEMIS probe P1 passed through the wake at 3.5 lunar radii downstream from the Moon, in a region between those explored by Wind and the Lunar Prospector, Kaguya, Chandrayaan, and Chang''E missions. ARTEMIS observed interpenetrating proton, alpha particle, and electron populations refilling the wake along magnetic field lines from both flanks. The characteristics of these distributions match expectations from self-similar models of plasma expansion into vacuum, with an asymmetric character likely driven by a combination of a tilted interplanetary magnetic field and an anisotropic incident solar wind electron population. On this flyby, ARTEMIS provided unprecedented measurements of the interpenetrating beams of both electrons and ions naturally produced by the filtration and acceleration effects of electric fields set up during the refilling process. ARTEMIS also measured electrostatic oscillations closely correlated with counter-streaming electron beams in the wake, as previously hypothesized but never before directly measured. These observations demonstrate the capability of the comprehensively instrumented ARTEMIS spacecraft and the potential for new lunar science from this unique two spacecraft constellation.