On the dynamics of the magnetosphere during geomagnetic storms and substorms (original) (raw)

Abstract

We attempt to quantify how the solar wind and the magnetosphere of the Earth self-organize during geomagnetic storms and substorms. Particularly, we analyze the auroral electrojet (AE) and polar cap (PC) indices as proxies of magnetospheric dynamics, while the product of Bz component of the interplanetary magnetic field and Solar wind's flow speed is treated as a proxy for the East-West electric field and for the solar wind energy input to the magnetosphere. We implement methods suitable for the analysis of non-stationary and short time series with underlying nonlinear dynamics, such as recurrence plot, empirical mode decomposition and wavelet analysis. Our results show that the solar wind electric field becomes more organized and predictable prior to magnetic storms.The magnetosphere exhibits organization similar to the solar wind during substorms. This result is consistent with recent findings of similar multifractal spectra of the Bz and AE signal on substorm time scales. Dur...

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