Physics
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.8197g&link_type=abstract
Journal of Geophysical Research (ISSN 0148-0227), vol. 95, June 1, 1990, p. 8197-8209.
Physics
78
Energy Spectra, Helios Satellites, Magnetic Field Configurations, Magnetohydrodynamic Turbulence, Solar Wind, Kinetic Energy, Magnetohydrodynamic Waves
Scientific paper
The existence of nonlinear cascades in the observed fluctuations of solar wind density, magnetic, and velocity fields observed by the Helios 1 mission is investigated. It is found that, while the whole spectrum of total turbulent energy undergoes very large daily variations both in its amplitude and spectral shape, the instantaneous spectrum follows a power law in the frequency range 0.0001-0.006 Hz. It is shown that both the amplitude and the spectral index depend on the proton temperature in a monotonic way, so that a large temperature leads to a low level of turbulence with a steep, Kolmogorov-like spectrum while a low temperature leads to a flatter spectrum with a high level of turbulence. Alfvenic periods occur mainly when density fluctuations are low and temperature is high. The strong dependence of both turbulent energy level and spectral slope on temperature is a new, unexpected property of solar wind turbulence which remains to be explained.
Grappin Roland
Mangeney Andre
Marsch Eckart
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