'Alfvenic' versus 'standard' turbulence in the solar wind

Details 'Alfvenic' versus 'standard' turbulence in the solar wind 'Alfvenic' versus 'standard' turbulence in the solar wind

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991angeo...9..416g&link_type=abstract

Annales Geophysicae (ISSN 0939-4176), vol. 9, June 1991, p. 416-426.

Physics

68

Interplanetary Medium, Magnetohydrodynamic Stability, Plasma Turbulence, Solar Wind, Heliosphere, Ulysses Mission

Scientific paper

A study is made of the variation of the properties of turbulence with stream structure, on time scales of hours and minutes, in the inner heliosphere at solar minimum. Between fast hot streams, this turbulence is found to show many properties typical of 'standard' weakly compressible magnetohydrodynamic (MHD) turbulence, such as excess of turbulent magnetic energy and a relative level of density fluctuation approximately equal to the turbulent Mach number squared. The discussion focuses on whether or not the more peculiar properties of Alfvenic turbulence, found within fast streams, represent some genuinely different state of MHD turbulence which might not relax toward standard turbulence at large distances from the sun and the ecliptic plane. The Ulysses spacecraft data should allow these possibilities to be distinguished.

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