Physics – Plasma Physics
Scientific paper
Mar 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999jgr...104.4559m&link_type=abstract
Journal of Geophysical Research, Volume 104, Issue A3, p. 4559-4566
Physics
Plasma Physics
2
Magnetospheric Physics: Mhd Waves And Instabilities, Space Plasma Physics: Nonlinear Phenomena, Magnetospheric Physics: Solar Wind/Magnetosphere Interactions
Scientific paper
We present Active Magnetospheric Particle Tracer Explorers Ion Release Module (AMPTE IRM) observations of a wave packet of compressional Pc5 ULF oscillations between 0915 and 1030 UT on October 28, 1984. The waves are observed in the local morning near the equatorial plane, have a dominant period of ~380 s, and most probably have a fundamental field-aligned harmonic structure. The waves have previously been interpreted as a magnetospheric waveguide mode propagating downtail [Mann et al., 1998]. At the time of the maximum amplitude of the waves, AMPTE IRM observes oscillations in the background density at a frequency twice that of the coincident ULF pulsations. We develop a theory which explains the generation of frequency-doubled density fluctuations through large-amplitude radial displacements of curved flux tubes in a nonadiabatic background plasma pressure distribution. The theory predicts a phase locking between the peaks and troughs of the radial velocity field and the peaks in the frequency-doubled density oscillations which is observed by AMPTE IRM. The observations strongly support the hypothesis that the frequency doubling occurs as a result of finite amplitude effects.
Chisham Gareth
Mann Ian R.
Wanliss James A.
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