Ion flux oscillations associated with a radially polarized transverse Pc 5 magnetic pulsation

Details Ion flux oscillations associated with a radially polarized transverse Pc 5 magnetic pulsation Ion flux oscillations associated with a radially polarized transverse Pc 5 magnetic pulsation

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990jgr....95.3717t&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 95, April 1, 1990, p. 3717-3731. Research supported by NASA.

Physics

36

Geomagnetic Micropulsations, Geomagnetism, Magnetic Field Configurations, Ampte (Satellites), Extremely Low Radio Frequencies, Ion Distribution

Scientific paper

The AMPTE CCE spacecraft observed a transverse Pc 5 magnetic pulsation (period of about 200 s) at 2155-2310 UT on November 20, 1985, at a radial distance of 5.7 - 7.0 earth radii, at a magnetic latitude of 1.2 - 19 deg, and near 1300 magnetic local time. The magnetic pulsation exhibits properties consistent with a standing Alfven wave with a second-harmonic standing structure along the ambient magnetic field. The amplitude and the phase of the flux pulsation are found to be a function of the particle detector look direction and the particle energy. The observed energy dependence of the shift is interpreted as the result of a drift-bounce resonance of the ions with the wave. From this interpretation it follows that the wave propagated westward with an azimuthal wave number of approximately 100. Thus the study demonstrates that particle data can be useful for determining the spatial structure of some types of ULF waves.

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