Generation of resonant Alfvén waves in the auroral oval

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 consi...

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Bibliographic Details
Published in:Annales geophysicae (1988) 2016-02, Vol.34 (2), p.241-248
Main Authors: Pilipenko, V. A., Klimushkin, D. Yu, Mager, P. N., Engebretson, M. J., Kozyreva, O. V.
Format: Article
Language:English
Subjects:
Alfven waves
Auroral oval
Electric fields
Extremely low frequencies
Field aligned currents
Field line resonance
Ionosphere
Magnetic fields
Magnetohydrodynamics
Magnetospheres
Plasma
Theory
Wave excitation
Wave power
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Summary: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.
ISSN:1432-0576
0992-7689
1432-0576
DOI:10.5194/angeo-34-241-2016