Mathematics – Dynamical Systems
Scientific paper
Aug 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.1731v&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 16, p. 1731-1734.
Mathematics
Dynamical Systems
14
Auroral Electrojets, Earth Magnetosphere, Interplanetary Magnetic Fields, Magnetic Anomalies, Magnetic Storms, Solar Wind, Degrees Of Freedom, Dynamical Systems, Ionospheric Conductivity, Ring Currents
Scientific paper
A damped linear oscillator (LRC circuit) predicts a significant amount of the AL index variations when it is driven by the IMF's B(South) component. The model parameters are determined from fitting the AL time series and show a small, apparently nonsystematic variation with the activity level. Following an isolated external disturbance the LRC model's response peaks at 15 min - 0.5 h and decays after 1-2 more hours. The time scales and the correlation between observed AL and the circuit output (60-80 percent) are in good agreement with earlier linear prediction filter results. The results support the modeling of the global magnetospheric behavior with dynamical systems of a few degrees of freedom.
Papadopoulos Konstantinos
Sharma Surjalal A.
Vassiliadis Dimitris
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