Statistics
Scientific paper
Jan 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993phdt........24c&link_type=abstract
Ph.D. Thesis California Univ., Los Angeles.
Statistics
Compression Waves, Earth Magnetosphere, Extremely Low Radio Frequencies, Linear Polarization, Magnetohydrodynamic Waves, Daytime, Satellite Observation, Space Plasmas
Scientific paper
The theory of ULF waves in the Earth's magnetosphere has three major predictions: the existence of the continuous shear Alfven spectrum which corresponds to the field line resonance with spatially varying frequencies; the existence of the discrete compressional Alfven spectrum which corresponds to the magnetospheric cavity mode with spatially independent eigenfrequencies; and the coupling between the two modes and the cavity eigenmode may be regarded as steady state driving source of field line resonance. Substantial evidence for the existence of field line resonance has been reported in many papers. The existence and significance of global modes in the magnetospheric cavity and the coupling between these two modes are of considerable current interest. This dissertation describes an investigation of ULF waves, predominantly in the Pc 3-4 frequency band, in the dayside magnetosphere. It can be divided into two parts. The first part presents two statistical studies of ULF wave phenomena in the earth's dayside magnetosphere. The occurrence rate statistics revealed two important facts. The first fact is the difference in occurrence rate distributions of Pc 3, Pc 4, and Pc 5 waves. Pc 3 and Pc 4 occurs mostly in a region around the local noon. Pc 5 occurs mostly in the dawn and dusk flank regions. The second fact is that the 'magnetopause normalization' had obvious effects on sharpening the patterns of Pc 3-4 occurrence. It demonstrates the effect of the dynamic magnetosphere on the wave distributions. The second statistical study is done by integrating wave power in the Pc 3-4 wave frequency bands. Our results show that most of the Pc 3-4 wave power is concentrated in the noon and afternoon region. This result agrees with the Alfven wave asymmetry between the morning and afternoon regions. In the second part of the dissertation, we studied two special type of ULF waves: linearly polarized waves and the compressional global cavity mode waves. We demonstrated that a substantial part of the Pc 3-4 waves observed in the earth's dayside magnetosphere are linearly polarized. Chapter five demonstrated some exciting new results.
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