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Measurement of the Electric Fluctuation Spectrum of Magnetohydrodynamic Turbulence
Bale, S. D.; Horbury, T. S.; Reme, H. +2 more
Magnetohydrodynamic (MHD) turbulence in the solar wind is observed to show the spectral behavior of classical Kolmogorov fluid turbulence over an inertial subrange and departures from this at short wavelengths, where energy should be dissipated. Here we present the first measurements of the electric field fluctuation spectrum over the inertial and…
Spatial Correlation of Solar-Wind Turbulence from Two-Point Measurements
Dasso, S.; Matthaeus, W. H.; Smith, C. W. +3 more
Interplanetary turbulence, the best studied case of low frequency plasma turbulence, is the only directly quantified instance of astrophysical turbulence. Here, magnetic field correlation analysis, using for the first time only proper two-point, single time measurements, provides a key step in unraveling the space-time structure of interplanetary …
Drift-Kinetic Alfvén Waves Observed near a Reconnection X Line in the Earth's Magnetopause
Balogh, A.; Reme, H.; Goldstein, M. L. +7 more
We identify drift-kinetic Alfvén waves in the vicinity of a reconnection X line on the Earth’s magnetopause. The dispersive properties of these waves have been determined using wavelet interferometric techniques applied to multipoint observations from the Cluster spacecraft. Comparison of the observed wave dispersion with that expected for drift-k…
Ion-Pressure Equations Derived from Measurements in Space
Stasiewicz, K.
Cluster measurements at the bow shock, the magnetosheath, and the magnetospheric boundary layer are used to derive ion-pressure equations for hot anisotropic plasmas. It is demonstrated that both perpendicular and parallel ion pressures are well approximated by polybaric expressions ∝NγBκ, where N is the plasma density, B is …