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Anisotropic Turbulent Spectra in the Terrestrial Magnetosheath as Seen by the Cluster Spacecraft

Balogh, A.; Belmont, G.; Sahraoui, F. +3 more

Here we report the first three-dimensional spatial spectrum of the low frequency magnetic turbulence obtained from the four Cluster spacecraft in the terrestrial magnetosheath close to the magnetopause. We show that the turbulence is compressible and dominated by mirror structures, its energy is injected at a large scale kρ∼0.3 (l∼2000 km) via a m…

Formation of Inner Structure of a Reconnection Separatrix Region

Nilsson, H.; André, M.; Vaivads, A. +3 more

We present multipoint spacecraft observations at the dayside magnetopause of a magnetic reconnection separatrix region. This region separates two plasmas with significantly different temperatures and densities, at a large distance from the X line. We identify which terms in the generalized Ohm’s law balance the observed electric field throughout t…

Wave-Number Spectra and Intermittency in the Terrestrial Foreshock Region

Glassmeier, K. -H.; Narita, Y.; Treumann, R. A.

Wave-number spectra of magnetic field fluctuations are directly determined in the terrestrial foreshock region (upstream of a quasiparallel collisionless shock wave) using four-point Cluster spacecraft measurements. The spectral curve is characterized by three ranges reminiscent of turbulence: energy injection, inertial, and dissipation range. The…