Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsh12a..03n&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SH12A-03
Physics
2149 Mhd Waves And Turbulence (2752, 6050, 7836), 2159 Plasma Waves And Turbulence, 4490 Turbulence (3379, 4568, 7863), 7863 Turbulence (4490)
Scientific paper
Energy spectra of the solar wind fluctuations have been extensively investigated by a number of spacecraft for almost four decades, but the analyses were made primarily on the basis of single point measurements. We determine energy spectra of the magnetic field fluctuations directly in the wavenumber domain using four-point measurements from the Cluster spacecraft. The wavenumber spectra exhibit features that are reminiscent of turbulence: an inertial range with the spectral slope approximately -5/3 at smaller wavenumbers; and a dissipation range at larger wavenumbers. This justifies the use of the frequency spectra in the earlier studies. Furthermore, we attempt to determine the spectra in the parallel and perpendicular direction to the mean magnetic field and also those of three invariants in ideal magnetohydrodymanics: total energy, cross helicity, and magnetic helicity using both velocity (from PEACE) and magnetic field measurements (FGM) on four spacecraft.
Glassmeier K.-
Goldstein Michel L.
Narita Yasuhito
Treumann Rudolf A.
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