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第十一届全国日地空间物理学术讨论会

作者： Malova H.V. Zelenyi L.M. Popov V.Yu. Delcourt D.C. Ganushkina N.Yu. Sharma A.S. NPI MSU IKI RAS IKI RAS MSU cetp CNRS FMI Maryland University USA

＜正＞Thin current sheets （TCSs） are known as sites of energy storage and release in the Earth’s magnetosphere. Self-consistent analytical model of multicomponent TCS has developed, where the tension of magnetic field lines is balanced by ion inertia rather than plasma pressure. The influence of electron population, which is quite fast enough to obey Boltzmann distribution along field lines, is taken into account. Electrostatic effects might lead to specific peculiarities of local current density profiles inside TCS, for example, to their splitting. It is shown that the contribution of oxygen ions in the total current is not very large, but current sheet becomes ten times more thickened. The dependence of these effects from electron and oxygen temperatures and the curvature of magnetic field lines are analyzed. Possible importance of these effects for the substorm processes in the Earth’s magnetotail is discussed.

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On the quasi-adiabatic motion of charged particles in double-humped current sheets

On the quasi-adiabatic motion of charged particles in double...

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第十一届全国日地空间物理学术讨论会

作者： H.V. Malova D.A.Ovodkov L.M.Zelenyi D.C.Delcourt Space Research Institute Moscow Russia Space Research Institute Moscow Russia Space Research Institute Moscow Russia cetp-CNRS Saint-Maur des Fossés France

＜正＞We examine the non-linear dynamics of charged particles in double-humped （"bifurcated"） current sheets. It was shown in previous studies that dynamical regimes in this case contrast with those obtained in single-humped （Harris-like） current sheets. In particular, it was demonstrated that quasi-adiabatic motion with negligible magnetic moment change may be obtained when the adiabaticity parameter approaches unity, a behavior that is at odds with the prominent magnetic moment scattering achieved in the single-humped case. Using single particle simulations, we demonstrate that dynamical behaviors in single-and double-humped current sheets actually differ throughout the whole adiabatic-nonadiabatic transition （i.e., for between 1 and 3）, with alternatively weak and enhanced diffusion in the latter case. Prominent bunching of the particles in gyration phase is also obtained that leads to the formation of nongyrotropic distribution functions. We show that, downstream of bifurcated current sheets, accelerated ion beams in the parallel direction may form even though one has 1 which is usually associated with enhanced particle trapping.

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Analysis of the Interaction between Low-Frequency Waves and Ions in the High-Altitude Cusp Region Observed by Satellite Cluster

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Chinese Physics Letters 2006年第5期23卷 1351-1354页

作者：段素平刘振兴曹晋滨史建魁路立李中元 Q. G. Zong H. Reme N. Cornilleau-Wehrlin A. Balogh M. Andre Key Laboratory of Space Weather Center for Space Science and Applied Research Chinese Academy of Sciences Beijing 100080 School of Earth and Space Sciences University of Science and Technology of China Hefei 230026 Center for Space Physics Boston University Boston MA 02215 USA CESR/CNRS 9 Avenue du Colonel Roche B.P.4346F-31028 Toulouse Cedex 4 France cetp 10/12 Avenue de L'Europe F-78140 Velizy France Space and Atmospheric physics group The Blackett Laboratory Imperial College Prince Consort Road London SW7 2BZ UK Swedish Institute of Space physics Uppsala Division Box 537 SE-751 21 Uppsala Sweden

The energy transfer between ions （protons） and low frequency waves （LFWs） in the frequency range f1 from 0.3 to 10 Hz is observed by Cluster crossing the high-altitude polar cusp. The energy transfer between low frequency waves and ions has two means. One is that the energy is transferred from low frequency waves to ions and ions energy increases, The other is that the energy is transferred from ions to low frequency waves and the ion energy decreases. lon gyratory motion plays an important role in the energy transfer processes. The electromagnetic field of f1 LFWs can accelerate or decelerate protons along the direction of ambient magnetic field and warm or refrigerate protons in the parallel and perpendicular directions of ambient magnetic field, The peak values of proton number densities have the corresponding peak values of electromagnetic energy of low-frequency waves. This implies that the kinetic Alfven waves and solitary kinetic Alfven waves possibly exist in the high-altitude cusp region.

关键词： POLAR CUSP ALFVEN-WAVE SPACECRAFT

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Multi-scale analysis of turbulence in the Earth’s Plasma sheet

Multi-scale analysis of turbulence in the Earth’s Plasma sh...

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第十一届全国日地空间物理学术讨论会

作者： R.Nakamura W.Baumjohann A.Balogh N.Cornilleau-Wehrlin Space Research Institute Austrian Academy of Sciences A-8042 Graz Austria Space Research Institute Austrian Academy of Sciences A-8042 Graz Austria The Blackett Laboratory Imperial College Prince Consort Road London SW7 2BZ United Kingdom cetp 10/12 Avenue de L’Europe F-78140 Velizy France

＜正＞During the last decade significant progress has been made in understanding MHD turbulence in the Earth’s plasma sheet. The four point measurements available from the Cluster mission enable spatiotemporal effects in data sets to be resolved. One application of these multipoint measurements is the determination of the wave vectors and hence the identification of wave modes that exist within the plasma. Fourier and wavelet analysis is used to describe the spectral index and scaling indices of the turbulence for different frequency regions. We study the characteristics and properties the wave, their nature, their relationship with reconnection. We investigate multi-scale transfer of energy towards dissipation scale, scale-dependent anisotropy characteristics of fluctuations and provide evidence for existence of strong cross-scale coupling during rapid plasma flows. The theoretical implications of these observations will be emphasized since they is not yet a general consensus on the role of waves and turbulence.

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