Wave-Number Spectra and Intermittency in the Terrestrial Foreshock Region

Details Wave-Number Spectra and Intermittency in the Terrestrial Foreshock Region Wave-Number Spectra and Intermittency in the Terrestrial Foreshock Region

Nov 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006phrvl..97s1101n&link_type=abstract

Physical Review Letters, vol. 97, Issue 19, id. 191101

Other

35

Solar Wind Plasma, Sources Of Solar Wind, Plasma Turbulence

Scientific paper

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 spectral index for the inertial range spectrum is close to Kolmogorov’s slope, -5/3. On the other hand, the fluctuations are highly anisotropic and intermittent perpendicular to the mean magnetic field direction. These results suggest that the foreshock is in a weakly turbulent and intermittent state in which parallel propagating Alfvén waves interact with one another, resulting in the phase coherence or the intermittency.

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