Physics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm31a0302d&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #SM31A-0302
Physics
2704 Auroral Phenomena (2407), 2722 Forecasting (7924, 7964), 2740 Magnetospheric Configuration And Dynamics, 2772 Plasma Waves And Instabilities (2471), 2788 Magnetic Storms And Substorms (7954)
Scientific paper
In previous studies, it was demonstrated that the presence of magnetic FLT results in an increase in the fundamental standing Alfvén wave (SAW) field-line resonance (FLR) frequencies corresponding to a particular Alfvén speed profile. In the current investigation, evidence is presented in support of a hypothesis that FLT enhances magnetic storm and sub-storm activity. In particular, FLT may be closely associated with the formation of localized auroral density cavities, which interact with lower and upper hybrid waves or Z modes resulting in mode conversion processes that lead to the formation of discrete auroral arcs. The predictive power of a torsion-like parameter in forecasting the triggering and evolution of ionospheric phenomena is assessed in the context of recent auroral roar observations.
Bekhor Steven H.
Dangoor O.
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