Measurements of the Poynting vector of standing hydromagnetic waves at geosynchronous orbit

Details Measurements of the Poynting vector of standing hydromagnetic waves at geosynchronous orbit Measurements of the Poynting vector of standing hydromagnetic waves at geosynchronous orbit

Feb 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83..697c&link_type=abstract

Journal of Geophysical Research, vol. 83, Feb. 1, 1978, p. 697-706.

Physics

7

Magnetohydrodynamic Waves, Poynting Theorem, Radiation Measurement, Satellite Observation, Standing Waves, Stationary Orbits, Ats 6, Drift Rate, Electric Fields, Energy Spectra, Magnetic Fields, Phase Shift, Radiant Flux Density

Scientific paper

The observation is discussed of a train of hydromagnetic waves with a period of about 150 sec seen at synchronous orbit by the ATS 6 spacecraft on June 27, 1974. The critical observation is a phase shift of 90 deg between east-west oscillations of the particle flow and the east-west component of magnetic field oscillations. This phase shift alone suggests a standing rather than a propagating hydromagnetic wave. Careful processing of the particle data makes it possible to determine the drift velocity and hence the electric field of the wave. The wave electric field together with the time-varying magnetic field reveals an oscillating Poynting vector with zero mean component aligned with the ambient magnetic field and nonzero azimuthal (westward) component.

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