An investigation of the nature of Pc5 pulsations using SuperDARN and magnetometer data.
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Abstract
Pc5 pulsations are global magnetohydrodynamic events in the magnetosphere. We employed
an Automated Pulsation Finder program to identify significant Pc5 pulsation events
in SuperDARN data. Those events for which a resonance of similar frequency band was
observed in more than one HF radar were selected. The three events presented here are
such that a similar resonance was observed in Goose Bay, Saskatoon and Pykkvibaer HF
radars, located in the northern polar region. One event was isolated in which the resonance
was observed at the conjugate hemisphere at Sanae, Antarctica. Those events have
a good data from magnetometer chains within the field of view of HF radars are chosen
for analysis. These two instruments complement each other. We combined these two
instruments to investigate the nature of the pulsation, determining its qualitative polarization
characteristics. Observations of a resonance that extend over a large fraction of
the polar region are rarely reported. A complex demodulation technique was employed to
determine the amplitude and phase relationship between field components observed by the
radars and magnetometer chains, this in turn, affords resolution of other characteristics
of pulsations such as wave number and phase velocity. We present results in a graphical
form and discuss them in the context of MHD theory of magnetic pulsations, speculating
on their generation mechanism.
Description
Ph. D. University of KwaZulu-Natal, Durban 2014.
Keywords
Magnetohydrodynamic waves., Radar., Magnetometers., Theses -- Physics.