On the angle between the average interplanetary magnetic field and the propagation direction of plane large amplitude Alfven waves

Details On the angle between the average interplanetary magnetic field and the propagation direction of plane large amplitude Alfven waves On the angle between the average interplanetary magnetic field and the propagation direction of plane large amplitude Alfven waves

Sep 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979georl...6..713l&link_type=abstract

Geophysical Research Letters, vol. 6, Sept. 1979, p. 713-716.

Astronomy and Astrophysics

Astronomy

2

Interplanetary Magnetic Fields, Magnetic Effects, Magnetohydrodynamic Waves, Plane Waves, Solar Wind, Angles (Geometry), Magnetohydrodynamic Stability, Plasma-Electromagnetic Interaction, Solar Terrestrial Interactions, Spaceborne Astronomy, Variance (Statistics)

Scientific paper

The paper shows that the experimentally observed close alignment of magnetic field minimum variance direction with the average magnetic field for Alfven waves in the solar wind is consistent with theoretically predicted properties of plane large amplitude Alfven waves in the MHD approximation. The theoretical properties of these Alfven waves constrain the time averaged magnetic field to cluster around the direction of minimum variance, which is aligned with the wave normal. Thus, spacecraft magnetometer observations in the solar wind of minimum variance directions strongly peaked about the average magnetic field direction are consistent with plane large amplitude Alfven waves which have wave normals aligned with the directions of minimum variance. This does not imply that geometrical hydromagnetic calculations for Alfven wave propagation direction in the solar wind are incorrect, but there is a discrepancy between geometrical hydromagnetics theory and observations that IMF minimum variance directions tend to be aligned with the ideal Parker spiral instead of the radial direction.

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