Physics
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991angeo...9..319t&link_type=abstract
Annales Geophysicae (ISSN 0939-4176), vol. 9, May 1991, p. 319-332.
Physics
40
Energy Spectra, Helios 2, Magnetohydrodynamic Waves, Plasma Oscillations, Solar Wind, Interplanetary Magnetic Fields, Kelvin-Helmholtz Instability, Power Spectra, Turbulence Models, Wave Propagation
Scientific paper
Two periods of very low cross-helicity fluctuations observed by Helios 2 near 1 AU in 1976 have been studied in detail. It is shown that in both cases, a nearly zero cross-helicity occurs together with an extremely low Alfven ratio 0.2 or less and a -5/3 power-law for the turbulent energy spectra. The simultaneous occurrence of these features is apparently not influenced by compressible fluctuations. This conclusion is drawn from a comparison between different observed spectra calculated by using the instantaneous Elsaesser variables, as well as smoothed Elsaesser fields evaluated by means of the averaged magnetic field intensity and particle number density. A possible scenario is suggested in which the observed fluctuations mainly result from convecting static structures, not involving any velocity variations, but merely 'Magnetic Field Directional Turnings'.
Marsch Eckart
Tu Chia-Ying
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