Quasi-harmonic character of Pc1 geomagnetic pulsations

Details Quasi-harmonic character of Pc1 geomagnetic pulsations Quasi-harmonic character of Pc1 geomagnetic pulsations

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989ge%26ae..29..748k&link_type=abstract

Geomagnetizm i Aeronomiia (ISSN 0016-7940), vol. 29, Sept.-Oct. 1989, p. 748-753. In Russian.

Physics

Geomagnetic Micropulsations, Harmonic Oscillation, Magnetic Signatures, Differential Equations, Nonlinearity, Wave Propagation

Scientific paper

Pc1 pulsations are analyzed in the framework of nonlinear oscillation theory. A phase-portrait method of quasi-harmonic oscillations is applied to the analysis of Pc1 pulsations. It is shown that the Pc1 spectrum contains a second harmonic that is cophase or antiphase with respect to the fundamental one. The presence of this second harmonic distorts the phase portrait, which becomes asymmetric with respect to the x axis. The present results are explained in the framework of the wave-propagation problem in a nonlinear dispersive medium.

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