Computer Science
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981stin...8218097b&link_type=abstract
Unknown
Computer Science
Interplanetary Medium, Magnetohydrodynamic Stability, Plasma Turbulence, Power Spectra, Solar Wind, Gyrofrequency, Helios 1, Helios 2, Interplanetary Magnetic Fields, Radial Distribution
Scientific paper
The radial evolution of the power spectra of the MHD turbulence within the trailing edge of high speed streams in the solar wind was investigated with the magnetic field data of Helios 1 and 2 for heliocentric distance between 0.3 and 0.9 AU. In the analyzed frequency range (.00028 Hz to .0083 Hz) the computed spectra have, near the Earth, values of the spectral index close to that predicted for an incompressible hydromagnetic turbulence in a stationary state. Approaching the Sun the spectral slope remains unchanged for frequencies f or approximately .00 Hz, whereas at lower frequencies, a clear evolution toward a less steep fall off with frequency is found. The radial gradient of the power in Alfvenic fluctuations depends on frequency and it increases upon increasing frequency. For frequencies f or approximately .00 Hz, however, the radial gradient remains approximately the same. Possible theoretical implications of the observational features are discussed.
Bavassano Bruno
Dobrowolny Marino
Mariani Franco
Ness Norman F.
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