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Ann. Geophys., 24, 2441-2444, 2006
www.ann-geophys.net/24/2441/2006/
© European Geosciences Union 2006
Propagation pattern of low frequency waves in the terrestrial magnetosheath
Y. Narita and K.-H. Glassmeier
Institut für Geophysik und extraterrestrische Physik, Mendelssohnstr. 3, D-38106 Braunschweig, Germany
Abstract. Propagation pattern (distribution of phase velocities)
is determined in three dimensions
in the terrestrial magnetosheath
on a statistical basis using Cluster spacecraft observations.
It is found that the anti-sunward propagation dominates
and that the propagation direction
is toward the magnetosheath flank
at smaller zenith angles, while it is toward the magnetopause
at larger angles.
This pattern is axially symmetric regardless of
the interplanetary magnetic field direction
and agrees qualitatively with
the density gradient directions in a hydromagnetic flow
model of the magnetosheath,
suggesting that the wave refraction mechanism is
more significant than the wave drift effect.
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