Other
Scientific paper
Jan 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988jgr....93....7t&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 93, Jan. 1, 1988, p. 7-20. Research supported by the Chinese Academy of S
Other
86
Magnetohydrodynamic Waves, Power Spectra, Proton Energy, Solar Wind, Vibration Damping, Wave Packets, Frequency Ranges, Helios Project, High Frequencies, Magnetic Moments, Wave Propagation
Scientific paper
The theoretical model of Tu et al. (1984) describing the radial variation of the power spectra of interplanetary Alfvenic fluctuations has been extended to explain the radial variations of Alfvenic fluctuations between 0.3 and 5 AU and of the solar wind proton temperature observed by Helios between 0.3 and 1 AU. The cascade energy flux function is derived, leading to a -5/3 power law in the high-frequency range of the spectrum and the corresponding analytical solution of the spectral equation. The calculated results concerning the spectrum and other parameters of Alfvenic fluctuations are presented and compared with observations. The radial variations of the heating rate and of the proton magnetic moment corresponding to the radial variation of the power spectra between 0.3 and 1 AU are given. A relationship between the thermal speed of the solar wind protons and the variance of the solar wind velocity fluctuations is presented.
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