Physics – Space Physics
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990phdt........57l&link_type=abstract
Thesis (PH.D.)--UNIVERSITY OF MINNESOTA, 1990.Source: Dissertation Abstracts International, Volume: 51-09, Section: B, page: 440
Physics
Space Physics
Wave Coupling
Scientific paper
The hydromagnetic wave phenomena in the magnetosphere have been an area of space physics and plasma physics where theory has been successful in explaining many features in satellite experiments and ground-based observations. Magnetohydro -dynamic (MHD) waves, which are composed of transverse Alfven waves and compressional waves, are usually coupled in space due to an inhomogeneous plasma density and curved magnetic field lines. In addition to these effects, hot temperature plasmas invoke various ultra low frequency (ULF) wave phenomena via macroscopic wave instabilities or wave particle resonant interactions. These properties of the coupling between the two different MHD waves have been analytically and numerically studied in a simplified model such as the box model with straight field lines. However, the real magnetosphere is rather close to a dipole field, even though the night side of the magnetosphere is significantly distorted from dipole geometry. The curvature of field lines plays an important role in understanding hydromagnetic wave coupling in the magnetosphere since the MHD wave propagation depends strongly on the curved magnetic fields. My main research is to study the hydromagnetic wave properties in an inhomogeneous and curved magnetic field system by considering realistic geometry. Most of the current theories are reviewed and a number of observations are introduced according to the wave excitation mechanism. My studies are also performed with the development of numerical models such as the two- and three-dimensional MHD dipole models. The aim of this work is an attempt to understand and classify the hydromagnetic wave behavior in inhomogeneous and hot plasmas with respect to the energy sources and their frequency band in the magnetosphere. Therefore, various excitation mechanisms for hydromagnetic waves will be examined to compare analytical and numerical results with the observations.
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