Search Publications
``Geography'' of ion acceleration in the magnetotail: X-line versus current sheet effects
Zelenyi, L. M.; Grigorenko, E. E.; Hoshino, M. +2 more
Field-aligned ion beams are often observed in the Plasma Sheet Boundary Layer (PSBL) of Earth's magnetotail. We studied two types of ion beams observed in the magnetotail at different times. Both types of ion beams are pitch angle-collimated along the magnetic field direction but they differ significantly with the width of ion velocity distributio…
Two-dimensional hybrid simulations of superdiffusion at the magnetopause driven by Kelvin-Helmholtz instability
Cowee, M. M.; Gary, S. P.; Winske, D.
This paper describes the self-consistent simulation of plasma transport across the magnetic field at the magnetopause driven by Kelvin-Helmholtz (KH) instability. Two-dimensional hybrid (kinetic ions, fluid electrons) simulations of the most KH-unstable configuration where the shear flow is oriented perpendicular to the uniform magnetic field are …
Elliptical polarization of Saturn Kilometric Radiation observed from high latitudes
Gurnett, D. A.; Kurth, W. S.; Cecconi, B. +6 more
The high-inclination orbits of the Cassini spacecraft from autumn 2006 until spring 2007 allowed the Cassini/RPWS (Radio and Plasma Wave Science) instrument to observe Saturn Kilometric Radiation (SKR) from latitudes up to 60° for the first time. This has revealed a surprising new property of SKR: above ∼30° in observational latitude, a significan…
Energetic ion dynamics of the inner magnetosphere revealed in coordinated Cluster-Double Star observations
Cao, Jinbin; Dandouras, Iannis; Vallat, Claire
Since early 2004 the Chinese spacecraft Tan Ce 1 (TC-1), first component of the Double Star (DSP) mission, has been on an equatorial elliptical orbit (13.4 R E apogee), allowing the study of the dynamics of the Earth's magnetosphere in conjunction with the four European Cluster spacecraft (19.6 R E apogee). The Cluster an…
Magnetic island formation between large-scale flow vortices at an undulating postnoon magnetopause for northward interplanetary magnetic field
Glassmeier, K. -H.; Le Contel, O.; Hasegawa, H. +10 more
Time History of Events and Macroscale Interactions during Substorms multispacecraft observations are presented for a ~2-h-long postnoon magnetopause event on 8 June 2007 that for the first time indicate that the trailing (sunward) edges of Kelvin-Helmholtz (KH) waves are commonly related to small-scale <0.56 R E magnetic islands or…
Plasma wave measurements with STEREO S/WAVES: Calibration, potential model, and preliminary results
Bale, S. D.; Goetz, K.; Maksimovic, Milan +3 more
The S/WAVES experiments on the two STEREO spacecraft measure waves, both in situ plasma waves and remotely generated waves such as Type II and Type III solar bursts. A part of the experiment is aimed at understanding the generation of electromagnetic waves from electrostatic Langmuir waves. For this, rapid measurements of plasma density, sufficien…
Statistics of multispacecraft observations of chorus dispersion and source location
Breneman, Aaron W.; Kletzing, Craig A.; Pickett, Jolene +2 more
We report emission characteristics of 52 chorus events on 23 August 2003 and 10 events on three other days, modeled with a ray tracing technique. Chorus waves have a characteristic frequency/time variation that is a combination of frequency separation by propagation dispersion and a time-dependent source frequency emission drift. A cross-correlati…
The source of Saturn's periodic radio emission
Kivelson, Margaret G.; Southwood, David J.
This paper proposes a model of the link between the pulsing radio signals from Saturn (Saturn kilometric radiation), known to be most intense on the morningside, and the rotating magnetic (cam) field structure identified on low-latitude orbits. On the high-inclination orbits of the Cassini spacecraft in late 2006, large-scale azimuthal deviations …
MHD model of the flapping motions in the magnetotail current sheet
Kubyshkin, I. V.; Semenov, V. S.; Erkaev, N. V. +2 more
A new kind of magnetohydrodynamic waves is analyzed for a current sheet in the presence of a small normal magnetic field component (B z ) varying along the sheet. For the initial undisturbed state, a simplified model of the current sheet is considered with a Harris-like current density distribution across the sheet. Within the framewor…
Quantitative estimates of the slab and 2-D power in solar wind turbulence using multispacecraft data
Horbury, T. S.; Osman, K. T.
A quantitative estimate of the field-aligned anisotropy of magnetohydrodynamic inertial range turbulence is obtained by comparing multispacecraft data with a fully three-dimensional turbulent magnetic field numerical model. The simulated turbulence is a superposition of slab fluctuations parallel to the mean field and 2-D fluctuations perpendicula…