GEOPHYSICAL RESEARCH LETTERS, VOL. 25, NO. 24, PAGES 4445-4448, DECEMBER 15, 1998
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An interpretation of the cross-phase spectrum of geomagnetic pulsations by the field line resonance theory

P. J. Chi and C. T. Russell
Institute of Geophysics and Planetary Physics, University of California, Los Angeles

Received August 27, 1998, revised October 15, 1998, accepted November 5, 1998

Abstract:

The cross-phase spectrum of the magnetic fields at two closely spaced stations located on the same meridian can be used to determine the field line resonance frequencies in the magnetosphere. The model of two harmonic oscillators previously proposed in the literature to interpret this technique, however, deviates from the traditional field line resonance model and it fails to interpret the cross-phase spectrum for the Z component. We show that the cross-phase spectrum can be interpreted by traditional field line resonance theory with consideration of ionospheric effects even in the presense of a continuum of non-interacting resonating field lines.


© 1998 by the American Geophysical Union
Paper number 1998GL900211.





© 1998 American Geophysical Union


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