Linear prediction filters for linear and nonlinear modeled geomagnetic activity

Details Linear prediction filters for linear and nonlinear modeled geomagnetic activity Linear prediction filters for linear and nonlinear modeled geomagnetic activity

Aug 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18.1635k&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 18, Aug. 1991, p. 1635-1638.

Physics

10

Linear Filters, Linear Prediction, Magnetospheric Instability, Solar Terrestrial Interactions, Faraday Effect, Magnetopause, Solar Wind

Scientific paper

It is shown that the Faraday loop analog model of geomagnetic activity exhibits both the directly driven and loading-unloading magnetospheric responses to solar wind input. It is further shown that the directly driven component is a linear response to loading while the loading-unloading response is nonlinear. Linear prediction filters which relate model input to output are discussed. By either allowing or suppressing the loading-unloading model response filters that relate to nonlinear or linear dynamics, respectively, have been computed. Filters that described the directly driven response are finite ranged; they asymptote to zero with increasing lag on a time scale that is fixed by the dissipation rate of the model. Filters that describe the nonlinear total response are infinite ranged; they asymptote with increasing lag to large amplitude periodic oscillations. Some implications of these infinite ranged filters are discussed.

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