Propagation of large amplitude Alfven waves in the solar wind neutral sheet

Details Propagation of large amplitude Alfven waves in the solar wind neutral sheet Propagation of large amplitude Alfven waves in the solar wind neutral sheet

Jun 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995sowi.conf...78m&link_type=abstract

Calabria Univ., International Solar Wind 8 Conference, p. 78

Computer Science

Solar Wind, Magnetohydrodynamic Waves, Neutral Sheets, Wave Propagation, Solar Wind Velocity, Magnetic Fields, Perturbation, Propagation Modes, Inhomogeneity, Plasma Interactions

Scientific paper

Analysis of solar wind fluctuation data show that the correlation between velocity and magnetic field fluctuations decreases when going farther away from the Sun. This decorrelation can be attributed either to the time evolution of the fluctuations, carried away by the solar wind, or to the interaction between the solar wind neutral sheet and Alfven waves. To check this second hypothesis we have numerically studied the propagation of Alfven waves in the solar wind neutral sheet. The initial conditions have been set up in order to guarantee B2 = const, so that the following numerical evolution is only due to the inhomogeneity in the background magnetic field. The analysis of the results shows that compressive structures are formed, mainly in the neutral sheet where they have been identified as pressure balanced structures, i.e., tangential discontinuities. Fast perturbations, which are also produced, have a tendency to leave the simulation domain, propagating also perpendicularly to the mean magnetic field. For this reason the level of fast perturbations is always smaller with respect to the previously cited plasma balanced structures, which are slow mode perturbations. A comparison between the numerical results and some particular observational issues is also presented.

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