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Please use this identifier to cite or link to this item: http://hdl.handle.net/1959.13/33841

Title
Revised time-of-flight calculations for high-latitude geomagnetic pulsations using a realistic magnetospheric magnetic field model
Author/Creator
Wild, J. A.;  Yeoman, T. K.;  Waters, C. L.
Institution
The University of Newcastle. Faculty of Science & Information Technology, School of Environmental and Life Science
Description
We present a simple time-of-flight analysis of Alfvén pulsations standing on closed terrestrial magnetic field lines. The technique employed in this study in order to calculate the characteristic period of such oscillations builds upon earlier time-of-flight estimates via the implementation of a more recent magnetospheric magnetic field model. In this case the model employed is the Tsyganenko (1996) field model, which includes realistic magnetospheric currents and the consequences of the partial penetration of the interplanetary magnetic field into the dayside magnetopause. By employing a simple description of magnetospheric plasma density, we are therefore able to estimate the period of standing Alfvén waves on geomagnetic field lines over a significantly wider range of latitudes and magnetic local times than in previous studies. Furthermore, we investigate the influence of changing season and upstream interplanetary conditions upon the period of such pulsations. Finally, the eigenfrequencies of magnetic field lines computed by the time-of-flight technique are compared with corresponding numerical solutions to the wave equation and experimentally observed pulsations on geomagnetic field lines.
Relation
Journal of Geophysical Research: Space Physics Vol. 110
Publisher Link
http://dx.doi.org/10.1029/2004JA010964
Date
2005
Publisher
American Geophysical Union
Keyword(s)
ULF waves;  time of flight analysis;  Tsyganenko;  wave period;  wave frequency
Resource Type
journal article
Identifier
http://hdl.handle.net/1959.13/33841
Identifier
ISSN:0196-6928
Reviewed
Reviewed
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Subject
"Journal of Geophysical Research: Space Physics"
 
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