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• W1982265555 abstract "Pearl pulsations, with an average repetition period of 60 s, were recorded using the magnetic and electric field experiments on the polar‐orbiting Viking satellite. The wave event occurred on September 30, 1986, during Viking orbit 1212 at 1030 MLT, from L = 3.6 to L = 4.1, and at an altitude of 13,500 km. Electron density observations obtained from Viking show that the waves were generated at the plasmapause and at lower amplitudes in the plasmasphere. The wave Poynting flux, calculated using the magnetic and electric field, indicated that the waves generally were propagating downward toward the ionosphere, although upward Poynting fluxes were observed. Clear evidence of upward propagating waves, associated with downward propagating waves reflected at the ionosphere, was not observed. Linear convective growth rates suggest that the anisotropic ions which provide the free energy have a perpendicular temperature around 15 keV. The repetition period, calculated using the measured electron density and magnetic field strength at Viking, is consistent with the double‐hop transit time for ion cyclotron waves which propagate along field lines from one hemisphere to the other. However, the absence of upward propagating wave packets implies that the upper limit of the wave ionospheric reflection coefficient is on the order of 10 to 20%. Alternative mechanisms for producing the observed repetition are also investigated and include a periodic generation model of pearl pulsations at the ion bounce period." @default.
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• W1982265555 date "1992-10-01" @default.
• W1982265555 modified "2023-09-30" @default.
• W1982265555 title "Viking magnetic and electric field observations of periodic Pc 1 waves: Pearl pulsations" @default.
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• W1982265555 doi "https://doi.org/10.1029/92ja00838" @default.
• W1982265555 hasPublicationYear "1992" @default.
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