Physics
Scientific paper
Sep 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010phrvl.105k1102b&link_type=abstract
Physical Review Letters, vol. 105, Issue 11, id. 111102
Physics
11
Mhd Waves, Plasma Waves, Turbulence, Plasma Turbulence, Interplanetary Magnetic Fields, Discontinuities
Scientific paper
Eight and a half years of magnetic field measurements (222 samples) from the ACE spacecraft in the solar wind at 1 A.U. are analyzed. Strong (large-rotation-angle) discontinuities in the solar wind are collected and measured. An artificial time series is created that preserves the timing and amplitudes of the discontinuities. The power spectral density of the discontinuity series is calculated and compared with the power spectral density of the solar-wind magnetic field. The strong discontinuities produce a power-law spectrum in the “inertial subrange” with a spectral index near the Kolmogorov -5/3 index. The discontinuity spectrum contains about half of the power of the full solar-wind magnetic field over this “inertial subrange.” Warnings are issued about the significant contribution of discontinuities to the spectrum of the solar wind, complicating interpretation of spectral power and spectral indices.
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