Storm time Pc 5 magnetic pulsation at the equator in the magnetosphere and its latitude dependence as measured on the ground

A discussion is presented of a Pc 5 magnetic pulsation event observed at L ∼5.5 at the equator in the magnetosphere and at four ground stations in the vicinity of the foot of the field line through the satellite. A large degree of similarity is observed in the field variations in the azimuthal (E-W) component at all locations. The wave in the transverse plane at the satellite is right-handed polarized, whereas at the ground stations it is observed to be left-handed polarized at all latitudes. All of the observations are consistent with a model of a wave source with a narrow localization between L ∼4.5 and L ∼5.0 in the latitudinal direction and a long azimuthal wavelength. Hot plasma particle measurements made on the satellite during the time of the event suggest that the excitation of the drift mirror instability may produce the hydromagnetic waves.

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