Abstract
STARE radar observations of a Pg pulsation are used to study the spatial variation of the hydromagnetic wave electric fields in the ionosphere. Both the north‐south and east‐west electric fields appear to exhibit resonant behavior. The oscillation is confined to approximately 2° of latitude and both components have similar amplitude maxima of order 40 mV m−1. The longitudinal phase variations yield an azimuthal wave number m ∼ 17 and the corresponding ionospheric phase velocity is 8 km s−1 westward. Although apparently resonant, the magnitude of the east‐west electric field is considerably larger than for previously reported resonant Pc 5's thought to originate in the Kelvin‐Helmholtz instability on the magnetopause. It is suggested that the Pg may be an even mode oscillation generated by a bounce resonance instability.
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