Computer Science
Scientific paper
Jan 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982p%26ss...30...57p&link_type=abstract
Planetary and Space Science, vol. 30, Jan. 1982, p. 57-66.
Computer Science
2
Interplanetary Magnetic Fields, Magnetohydrodynamic Stability, Magnetohydrodynamic Turbulence, Power Spectra, Space Exploration, Magnetic Measurement, Pioneer 10 Space Probe, Pioneer 11 Space Probe, Random Errors, Solar Wind
Scientific paper
Power spectra of vector components of interplanetary magnetic field fluctuations near 4-5 AU during quiet intervals shows a frequency dependence very close to f to the s power over the frequency range 0.00004 to 0.009 Hz (corresponding to periods of 7 hours, 2 minutes). While the spectra are generally very close to power law in frequency, variations in slope among the spectra exceed those expected from random errors and may represent true temporal variations. Mean slopes corrected for systematic error are s = -1.50 + or - 0.02 (Pioneer 10, mean heliocentric distance 5.3 AU) and s = -1.52 + or - 0.02 (Pioneer 11, mean heliocentric distance 3.9 AU) and are consistent with several determinations of spectral slope for magnetic fluctuations near 1 AU. The observations are compared with theoretical models of outward propagating Alfven waves of solar origin and of MHD turbulence, and the mean slopes agree well with that expected for turbulence.
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