New Alfven Resonator in the Topside Ionosphere Beneath the Auroral Acceleration Region?

Details New Alfven Resonator in the Topside Ionosphere Beneath the Auroral Acceleration Region? New Alfven Resonator in the Topside Ionosphere Beneath the Auroral Acceleration Region?

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm11c..08p&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SM11C-08

Physics

2407 Auroral Ionosphere (2704), 2431 Ionosphere/Magnetosphere Interactions (2736), 2471 Plasma Waves And Instabilities, 2752 Mhd Waves And Instabilities

Scientific paper

The possible occurrence of a new resonator in the topside ionosphere at auroral latitudes is proposed. This resonator is formed between the E-layer of the ionosphere and the bottom boundary of the auroral acceleration region (AAR) which has a localized field-aligned potential drop. The AAR is shown to effectively reflect Alfven waves with transverse scales less than the Alfven transit scale. The proposed resonator can trap and accumulate Alfvenic small-scale disturbances with periods from a few seconds to a few tens of seconds, and with transverse scales from km to few tens of km. The resonant features of the AAR-associated resonator are estimated to be more evident than that of the ionospheric Alfven resonator. The small-scale Alfvenic structures commonly observed by satellites can be generated by a non-steady field-aligned current transported by precipitating electrons and trapped in the AAR-associated resonator. Observations at Antarctic magnetic stations evidence the occurrence of highlighted frequency and its harmonic in the dynamic spectra of Pi 1 pulsations in accord with the theoretical model predictions.

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