Other
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsh32b..07n&link_type=abstract
American Geophysical Union, Fall Meeting 2007, abstract #SH32B-07
Other
2149 Mhd Waves And Turbulence (2752, 6050, 7836), 7863 Turbulence (4490)
Scientific paper
We present direct measurement of wave number spectra in the solar wind. We use magnetic field data obtained by the four CLUSTER spacecraft and apply the wave telescope method, which is particularly suited for multi- spacecraft data analyses, to determine the spectra of two-dimensional, Alfvénic, and compressible turbulence. The wave number spectra are characterized by the power law on intermediate scales (1000-10,000 km) and spectral breaks on smaller scales (100 km), reminiscent of turbulence. The wave number spectra also exhibit dominance of two-dimensional turbulence and only small contribution of compressible turbulence, which justifies the assertion of incompressible fluctuations in the solar wind and accounts for why the mean free paths of the cosmic rays are larger than predicted by the quasi-linear theory. On the other hand, the wave number spectra exhibit some different properties from that of the frequency spectra derived from the single spacecraft measurements. We discuss possible reasons and implications of the spectral differences between the wave number and frequency domain.
Gary S.
Glassmeier K.-
Goldstein Michel L.
Narita Yasuhito
Treumann Rudolf A.
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