Standing hydromagnetic waves observed by ISEE 1 and 2 - Radial extent and harmonic

Details Standing hydromagnetic waves observed by ISEE 1 and 2 - Radial extent and harmonic Standing hydromagnetic waves observed by ISEE 1 and 2 - Radial extent and harmonic

May 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982jgr....87.3519s&link_type=abstract

Journal of Geophysical Research, vol. 87, May 1, 1982, p. 3519-3529.

Physics

93

Earth Magnetosphere, International Sun Earth Explorers, Magnetohydrodynamic Waves, Standing Waves, Geomagnetic Pulsations, Plasma Density, Resonant Frequencies

Scientific paper

Direct measurements of the spatial extent of the resonant hydromagnetic waves associated with Pc 4 and 5 magnetic pulsations made by the closely spaced ISEE 1 and 2 satellites are presented together with ISEE 1 determinations of the harmonic of the resonant waves. The use of two satellites in similar orbits, which makes it possible to distinguish between spatial and temporal features, has shown the resonant region widths to extend over about 0.2 to 1.6 L shells for three events detected on the dayside between L = 4 and L = 7. The two events for which plasma density data was available occurred at plasma density gradients in the vicinity of the plasmapause. The standing wave harmonic was determined by the combination of two techniques: the comparison of the observed wave period with that predicted by standing wave theory, and the comparison of the phases of the observed wave electric and magnetic field. The two events analyzed are found to be second harmonic oscillations, suggesting internal generation in the magnetosphere by a bounce resonant mechanism.

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