Viking magnetic and electric field observations of periodic Pc 1 waves - Pearl pulsations

Details Viking magnetic and electric field observations of periodic Pc 1 waves - Pearl pulsations Viking magnetic and electric field observations of periodic Pc 1 waves - Pearl pulsations

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....9714823e&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, no. A10, p. 14,823-14,832.

Physics

25

Geomagnetic Pulsations, Ion Cyclotron Radiation, Magnetospheric Electron Density, Space Plasmas, Magnetohydrodynamic Waves, Plasmapause, Wave Propagation

Scientific paper

Magnetic- and electric-field observations of pearl pulsations by the Viking spacecraft are reported, and characteristics of the waves are discussed. Among the results described are electron-density observations, the wave Poynting flux, and linear convective growth rates. The waves are found to propogate downwards primarily from the plasmapause and plasmasphere where they are generated. It is theorized that the anisotropic ions have a perpendicular temperature of approximately 15 keV, and the results support the 'double-hop transit time' for ion-cyclotron waves which propagate along field lines. The ionospheric wave-reflection coefficient is given an approximate upper bound based on the prominence of downward propagating wave packets. The data also support a proposed mechanism of periodic wave generation that could lead to the observed repetition periods without wave reflection. The observations are shown to yield valuable data regarding the mechanisms that produce pearl pulsations.

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