Regensburg 2022 – wissenschaftliches Programm
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DY: Fachverband Dynamik und Statistische Physik
DY 8: Data Analytics for Complex Systems (joint session DY/SOE)
DY 8.10: Vortrag
Montag, 5. September 2022, 17:30–17:45, H18
Recurrence-based analysis of instantaneous fractal characteristics of geomagnetic variability — •Reik V. Donner1,2, Tommaso Alberti3, and Davide Faranda4 — 1Hochschule Magdeburg-Stendal, Magdeburg, Germany — 2Potsdam Institute for Climate Impact Research, Potsdam, Germany — 3National Institute for Astrophysics, Rome, Italy — 4LSCE, Université Paris-Saclay, Gif-sur-Yvette, France
We employ two complementary approaches based on the concept of recurrences in phase space to quantify the local (instantaneous) and global fractal dimensions of the temporal variations of a suite of low (SYM-H, ASY-H) and high latitude (AE, AL, AU) geomagnetic indices and discuss similarities and dissimilarities of the obtained patterns for one year of observations during a solar activity maximum. Subsequently, we introduce bivariate extensions of both approaches, and demonstrate their capability of tracing different levels of interdependency between low and high latitude geomagnetic variability during periods of magnetospheric quiescence and along with perturbations associated with geomagnetic storms and magnetospheric substorms, respectively. Our results open new perspectives on the nonlinear dynamics and intermittent mutual entanglement of different parts of the geospace electromagnetic environment, including the equatorial and westward auroral electrojets, in dependence of the overall state of the geospace system affected by temporary variations of the solar wind forcing.