Computer Science – Sound
Scientific paper
Dec 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsm32a0795s&link_type=abstract
American Geophysical Union, Fall Meeting 2001, abstract #SM32A-0795
Computer Science
Sound
2407 Auroral Ionosphere (2704), 2437 Ionospheric Dynamics, 2736 Magnetosphere/Ionosphere Interactions, 2752 Mhd Waves And Instabilities, 2753 Numerical Modeling
Scientific paper
Results from a numerical investigation of small-scale, intense (>100 mV/m) electric fields, frequently observed by satellites and sounding rockets at relatively low altitude (about 1000 km) above the auroral ionosphere, and their connection with fluxes of precipitating particles are presented. A causal explanation of these fields is given in terms of shear Alfvén waves, generated in the nightside plasmasheet boundary layer or equatorial magnetosphere where various energy sources reside. These waves can produce significant parallel electric fields by interacting with plasma microturbulence in a collisionless resistive layer (auroral auroral acceleration region) that forms at an altitude of about 1 RE. The Alfvén wave-sustained micoturbulence and parallel electric fields heat and accelerate particles along magnetic field lines. Recent investigations of the interaction between Alfvén waves and the microturbulent layer show that this layer effectively reflects the small-scale Alfvén waves, incident from above, preventing them from penetrating to low altitudes. This study shows how small-scale, intense electric fields can be generated below the auroral acceleration region due to the modification of the ionospheric conductivity, when the ionosphere interacts with large-scale Alfvén waves. This non-linear interaction of the magnetospheric Alfvén waves with the ionosphere is investigated as a function of wave parameters (frequency, amplitude, transverse wavelength), as well as parameters of the low-altitude plasma (density, temperature, ionospheric conductivities). Applications of the numerical results to selected auroral observations are discussed.
Lotko William
Pokhotelov Dimitri
Streltsov Anatoly V.
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