Physics
Scientific paper
Feb 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986jgr....91.1706b&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 91, Feb. 1, 1986, p. 1706-1710. NASA-supported research.
Physics
38
Interplanetary Medium, Magnetohydrodynamic Waves, Solar Wind, Interplanetary Magnetic Fields, Magnetohydrodynamic Turbulence, Pioneer 10 Space Probe, Pioneer 11 Space Probe, Power Spectra, Radial Distribution
Scientific paper
The radial evolution of the power spectra of Alfvénic fluctuations observed within the trailing edge of high speed streams in the solar wind has been investigated using magnetic field measurements by Pioneer 10 and Pioneer 11 at heliocentric distances between 1 and 5 AU. In the analyzed frequency range (2.8×10-4 to 8.3×10-3Hz) the spectral index of the computed spectra does not depend on frequency and is close to the value predicted for hydrodynamic turbulence. The radial gradient of the power density is independent of frequency and only slightly steeper than that expected for undamped propagation of Alfvénic fluctuations in a rarefaction region. The relation between the present results and those previously obtained by Helios 1 and 2 inside 1 AU is discussed.
Bavassano Bruno
Smith Edward. J.
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