국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
타이틀	Kinetic-Scale Magnetic Turbulence and Finite Larmor Radius Effects at Mercury
저자	Uritsky, V. M.;; Slavin, J. A.;; Khazanov, G. V.;; Donovan, E. F.;; Boardsen, S. A.;; Anderson, B. J.;; Korth, H.
Keyword	BOUNDARIES;; CURRENT SHEETS;; LARMOR RADIUS;; MAGNETOHYDRODYNAMICS;; MAGNETOPAUSE;; MERCURY (PLANET); MESSENGER (SPACECRAFT); OSCILLATIONS;; PLANETARY MAGNETIC FIELDS;; PLASMA INTERACTIONS;; SOLAR WIND;; STATISTICAL DISTRIBUTIONS;; TURBULENCE
URL	http://dx.doi.org/10.1029/2011JA016744
보고서번호	GSFC.JA.5483.2011
발행년도	2011
출처	NTRS (NASA Technical Report Server)
ABSTRACT	We use a nonstationary generalization of the higher-order structure function technique to investigate statistical properties of the magnetic field fluctuations recorded by MESSENGER spacecraft during its first flyby ྡ/14/2008) through the near-Mercury space environment, with the emphasis on key boundary regions participating in the solar wind - magnetosphere interaction. Our analysis shows, for the first time, that kinetic-scale fluctuations play a significant role in the Mercury''s magnetosphere up to the largest resolvable timescale (approx.20 s) imposed by the signal nonstationariry, suggesting that turbulence at this plane I is largely controlled by finite Larmor radius effects. In particular, we report the presence of a highly turbulent and extended foreshock system filled with packets of ULF oscillations, broad-band intermittent fluctuations in the magnetosheath, ion-kinetic turbulence in the central plasma sheet of Mercury''s magnetotail, and kinetic-scale fluctuations in the inner current sheet encountered at the outbound (dawn-side) magnetopause. Overall, our measurements indicate that the Hermean magnetosphere, as well as the surrounding region, are strongly affected by non-MHD effects introduced by finite sizes of cyclotron orbits of the constituting ion species. Physical mechanisms of these effects and their potentially critical impact on the structure and dynamics of Mercury''s magnetic field remain to be understood.