Physics
Scientific paper
Nov 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jgr....9212023r&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 92, Nov. 1, 1987, p. 12023-12035. NASA-supported research.
Physics
230
Interplanetary Magnetic Fields, Low Frequencies, Magnetohydrodynamic Waves, Shear Flow, Solar Oscillations, Solar Wind, Helios Project, Kinetic Energy, Solar System, Voyager Project
Scientific paper
Hour-averaged data from the Helios and Voyager spacecraft are used here to investigate the origin and evolution of low-frequency interplanetary fluctuations from 0.3 to 20 AU. The previously observed evolution toward a less purely Alfvenic state with increasing heliocentric distance is shown to occur more rapidly in the inner heliosphere and in low-speed as well as high-speed streams. It is concluded that outward-traveling flucutations are predominantly generated by the sun, but that in situ turbulence, most likely due to stream shear, generates fluctuations with both inward and outward senses of correlation.
Goldstein Michel L.
Klein Larry W.
Matthaeus William H.
Roberts Daniel A.
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