Computer Science – Sound
Scientific paper
Sep 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aipc..679..445c&link_type=abstract
SOLAR WIND TEN: Proceedings of the Tenth International Solar Wind Conference. AIP Conference Proceedings, Volume 679, pp. 445-4
Computer Science
Sound
Particle Emission, Solar Wind, Solar Wind Plasma, Sources Of Solar Wind
Scientific paper
The outer scale of turbulence in the solar wind has been estimated from frequency fluctuation data recorded during radio sounding experiments using the Galileo and Ulysses spacecraft carrier signals at 2295 MHz. The outer scale was observed to increase approximately linearly with increasing heliocentric distance in the range between 7 and 80 Rsolar. A model is presented here for the formation and evolution of the turbulence outer scale. The model is based on the assumption that the density fluctuations are caused by nonlinear interactions of Alfvén waves and that the rates of linear and nonlinear processes are nearly equal in the spectral range near the inverse outer scale. The dependence of the turbulence outer scale on heliocentric distance and local plasma parameters is investigated for three possible nonlinear wave coupling mechanisms: strong interactions (Kolmogorov turbulence), three-wave interactions (Kraichnan turbulence), and four-wave interactions. Comparisons of the model with the observations indicate that the three-wave decay processes with participation of both Alfvén and magnetosonic waves are the main type of nonlinear interactions in the inertial range of the turbulence power spectra.
Bird Michael K.
Chashei Igor V.
Efimov Alexander I.
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