Physics
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990georl..17..283t&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 17, March 1990, p. 283-286.
Physics
44
Magnetohydrodynamic Turbulence, Power Spectra, Solar Wind Velocity, Energy Spectra, Magnetic Field Configurations, Magnetohydrodynamic Waves, Sunspot Cycle
Scientific paper
The variation of the power spectra (e+/-) of the fluctuating Elsaesser variables deltaZ+/- with the solar wind velocity has been examined by either individual case study or statistical analysis with Helios data obtained near solar minimum. It is found, when going from high-speed to low-speed wind, that the slopes of both energy spectra systematically increase toward the value given by Kolmogorov's law. The power density of deltaZ+ in the Alfvenic regime above f = 0.0002 Hz strongly decreases while the power density of deltaZ- does not change a lot. A somewhat higher level of e- is found in the leading edges of high-speed streams near the regions of large velocity shear. The relevance of these findings with respect to the evolution of the solar wind MHD turbulence is discussed.
Marsch Eckart
Rosenbauer Helmut
Tu Chia-Ying
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