Alfven waves in the auroral ionosphere - A numerical model compared with measurements

Details Alfven waves in the auroral ionosphere - A numerical model compared with measurements Alfven waves in the auroral ionosphere - A numerical model compared with measurements

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992jgr....97...77k&link_type=abstract

Journal of Geophysical Research (ISSN 0148-0227), vol. 97, Jan. 1, 1992, p. 77-90. Research supported by NATO.

Computer Science

Sound

47

Atmospheric Models, Auroral Zones, Magnetohydrodynamic Waves, Magnetosphere-Ionosphere Coupling, Wave Reflection, Field Aligned Currents, Numerical Analysis, Rocket Sounding, Wave Interaction

Scientific paper

A linear numerical model of Alfven waves reflecting from the high-latitude ionosphere is solved, to better understand the role of the ionosphere in the magnetosphere/ionosphere coupling process and to compare model results with in situ measurements. The model is used to compute the frequency-dependent amplitude and phase relations between the meridional electric and the zonal magnetic fields due to Alfven waves. These relations are compared with measurements taken by an auroral sounding rocket flown in the morningside oval and by the HILAT satellite traversing the oval at local moon. The sounding rocket's trajectory was mostly parallel to the auroral oval, and it measured enhanced fluctuating field energy in regions of electron precipitation. The rocket-measured phase data are in excellent agreement with the Alfven wave model, and the relation between the modeled and the measured amplitudes is fair, leading to a conclusion that the rocket-measured fields are dominated by interfering Alfven waves, forming a standing wave pattern. The field amplitudes measured by HILAT are related by the height-integrated Pedersen conductivity indicating that the measured fluctuations were due mainly to structured field-aligned current systems.

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