Magnetic field-aligned electrodynamics of Alfven/ion cyclotron waves

Details Magnetic field-aligned electrodynamics of Alfven/ion cyclotron waves Magnetic field-aligned electrodynamics of Alfven/ion cyclotron waves

Nov 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993jgr....9819435m&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 98, no. A11, p. 19,435-19,441

Physics

2

Cyclotron Frequency, Electric Fields, Field Aligned Currents, Magnetohydrodynamic Waves, Anisotropy, Earth Magnetosphere, Geomagnetism, Plasma Pressure, Wave Propagation

Scientific paper

We report on the first experimental determination of the magnetic field-aligned electric field (E(sub parallel)) of an Alfven/ion cyclotron (A/I) wave. The wave was observed propagating in the geostationary regions of the Earth's magnetosphere with a frequency of 1/3 the proton cyclotron frequency. Electron oscillations parallel to (B) are used in the determination of E(sub parallel). E(sub parallel) is found to be a factor of approx. 18 greater than anticipated from cold plasma theory (i.e., electron inertial effects). The inclusion of electron pressure and pressure anisotropy brings reasonable agreement between the observations and linear wave theory.

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