GENERATION OF RESONANT ALFVEN WAVES IN THE AURORAL OVALстатья
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Дата последнего поиска статьи во внешних источниках: 10 августа 2018 г.
Аннотация:Many independent observations have shown that resonant field line Pc5 pulsations (typical periods of about several minutes) are preferably excited inside the auroral oval. Consideration of the most evident interpretation schemes shows that there is no simple explanation of this
effect. Here we consider theoretically the generation of toroidal Pc5 Alfvén waves by fluctuating magnetospheric field-aligned currents. It is shown that the Alfvén wave latitudinal
structure has the same features as in the case of the classical field line resonance driven by external sources: a peak localized in latitude and a 180 phase shift across the resonant
magnetic shell. This model suggests an additional mechanism of ultra-low-frequency (ULF) wave excitation which can operate at auroral latitudes.