High-frequency wave normals in the solar wind

Details High-frequency wave normals in the solar wind High-frequency wave normals in the solar wind

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984georl..11..492h&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 11, May 1984, p. 492-495.

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Interplanetary Magnetic Fields, Magnetic Variations, Magnetohydrodynamic Waves, Solar Wind Velocity, Apollo 12 Flight, Bow Waves, Explorer 35 Satellite, Shock Waves, Spherical Coordinates, Wave Fronts

Scientific paper

High-frequency (0.01-0.04 Hz) magnetic fluctuations in 506 ten-minute intervals of contemporaneous Explorer 35 and Apollo 12 measurements made in the solar wind near the morning side of the earth's bow shock show the presence of a large population of disturbances resembling Alfven waves. Each wavefront normal is systematically aligned (median deviation = 35 deg) with the associated ten-minute average of the magnetic field. Because of variability in the direction of this ten-minute average, from one interval to another, the coupled wavefront-normal distribution is nearly isotropic in solar ecliptic coordinates, in contrast with the results of other studies of waves at much lower frequency indicating outward propagation from the sun. Presumably the high frequency waves discussed here are stirred into isotropy (in solar ecliptic coordinates) by following the low frequency fluctuations. As these waves maintain their alignment of wavefront-normal with the field ten-minute average despite the great variation of the field ten-minute average, a strong physical alignment constraint is inferred.

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