Physics
Scientific paper
Aug 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980jgr....85.4283p&link_type=abstract
Journal of Geophysical Research, vol. 85, Aug. 1, 1980, p. 4283-4287.
Physics
4
Interplanetary Space, Magnetohydrodynamic Waves, Solar Wind, Wave Propagation, Complex Numbers, Direction, Pioneer 10 Space Probe, Pioneer 11 Space Probe, Propagation Modes, Vector Analysis
Scientific paper
The real and imaginary parts of spectral matrices of magnetic field fluctuations near 4 and 5 AU are used separately to generate estimates of hydromagnetic wave normal directions over the frequency range 0.00001 to 0.01 Hz in the spacecraft frame. Both procedures suggest the predominance of the Alfven mode over the fast and slow MHD modes among transverse magnetic field perturbations. Both procedures also show that the Alfven mode is more common among transverse perturbations at 4 AU than at 5 AU. Statistical techniques are for estimating uncertainties in computed wave normal directions and it is concluded that the real parts of the spectral matrices are more useful than the imaginary parts in specifying wave normals at times of magnetic quiet in the solar wind near 4 and 5 AU.
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