The magnetosphere as a complex system

Valdivia, J. A.; Rogan, José; Muñoz, Vı́ctor; Toledo, B. A.; Stepanova, M. V.

doi:10.1016/j.asr.2012.04.004

Cited by 33 publications

(29 citation statements)

References 43 publications

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“…This distinct behavior has motivated the description of the Earth's magnetosphere as a complex system composed of several nonlinearly coupled subsystems, within which multiple interconnected processes act on a wide range of spatial and temporal scales (Chang, ; Consolini, ; Klimas et al, ; Valdivia et al, ; Watkins et al, , and references therein). Vassiliadis et al () provided evidence of large‐scale coherence in magnetosphere dynamics manifested as low‐dimensional chaos in time series of auroral electrojet ( A E ) index measurements.…”

Section: Introductionmentioning

confidence: 99%

Recurrence‐Based Quantification of Dynamical Complexity in the Earth's Magnetosphere at Geospace Storm Timescales

et al. 2019

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Magnetic storms are the most prominent global manifestations of out‐of‐equilibrium magnetospheric dynamics. Investigating the dynamical complexity exhibited by geomagnetic observables can provide valuable insights into relevant physical processes as well as temporal scales associated with this phenomenon. In this work, we utilize several innovative data analysis techniques enabling a quantitative nonlinear analysis of the nonstationary behavior of the disturbance storm time (Dst) index together with some of the main drivers of its temporal variability, the VBSouth electric field component, the vertical component of the interplanetary magnetic field, Bz, and the dynamic pressure of the solar wind, Pdyn. Using recurrence quantification analysis and recurrence network analysis, we obtain several complementary complexity measures that serve as markers of different physical processes underlying quiet and storm time magnetospheric dynamics. Our approach discriminates the magnetospheric activity in response to external (solar wind) forcing from primarily internal variability and highlights the case‐specific nature of interdependencies between the Dst index and its potential drivers that need to be accounted for in future improved space weather forecasting models.

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Section: Introductionmentioning

confidence: 99%

Recurrence‐Based Quantification of Dynamical Complexity in the Earth's Magnetosphere at Geospace Storm Timescales

et al. 2019

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“…[2] There is mounting evidence that plasmas can demonstrate very complex behavior, that include multiscale dynamics, emergence and self organization, phase transitions, turbulence, spatiotemporal chaos, etc. [Lu, 1995;Carreras et al, 1996;Valdivia et al, 1996Valdivia et al, , 2003Valdivia et al, , 2005Valdivia et al, , 2006Biskamp, 2000;Klimas et al, 2000Klimas et al, , 2010Uritsky et al, 2007].…”

Section: Introductionmentioning

confidence: 99%

“…[7] Even though the plasma sheet appears to be a dynamic and turbulent region [Borovsky et al, 1997;Ohtani et al, 1998], the substorm cycle seems coherent and repeatable with identifiable distinct phases [Baker et al, 1999] and predictable geomagnetic indices [Vassiliadis et al, 1995;Valdivia et al, 1996Valdivia et al, , 1999. It has been suggested that the resolution to these seemingly contradicting observations should be through the understanding of the process of self organization in plasmas [Chang, 1999;Uritsky and Pudovkin, 1998;Valdivia et al, 2005Valdivia et al, , 2006Uritsky et al, 2009a]. The possibility of an inverse turbulent cascade has been discussed by Uritsky et al [2001] and Rosa et al [1998].…”

Section: Introductionmentioning

confidence: 99%

Spatial distribution of the eddy diffusion coefficients in the plasma sheet during quiet time and substorms from THEMIS satellite data

et al. 2011

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During the last decade, a number of studies have shown that turbulent processes in the plasma sheet are very important for the analysis of the formation of quasi‐stable plasma sheet configurations. The existence of this turbulence provides a self‐consistent approach to study the dynamics of the Earth's magnetosphere, including the plasma sheet stability. The turbulence can also be very important for an understanding of the location of an isolated substorm expansion phase onset. In this study the level of turbulence has been evaluated by calculating the eddy diffusion coefficients using the Time History of Events and Macroscale Interactions during Substorms satellite data. It was found that the value of the eddy diffusion coefficients may vary by at least 3 orders of magnitude, generally ranging from 103 to 106 km2/s, increasing with the distance from the Earth. The area of low eddy diffusion coefficients, less than 104 km2/s, is situated at distances below 12 RE in the tail where we found the transition region between the dipole and the tail‐like geomagnetic field configuration. This region is consistent with the location of isolated substorms, as indicated by the first auroral arc brightening situated at the equatorial edge of the auroral oval.

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“…In particular, it has been suggested that various magnetized plasma systems are in a self-organized critical state, exhibiting fractal and multifractal features which relate them to a broader class of complex systems. This has been the case in studies on the Earth's magnetosphere (Chang, 1999;Valdivia et al, 2005Valdivia et al, , 2003Valdivia et al, , 2006Valdivia et al, , 2013, the solar wind (Macek, 2010), the solar photosphere, and solar corona (Berger and Asgari-Targhi, 2009;Dimitropoulou et al, 2009). Some authors have discussed the relationship between the fractal dimension and physical processes in magnetized plasmas in the Sun-Earth system, including the possibility of forecasting geomagnetic activity (Aschwanden and Aschwanden, 2008;Uritsky et al, 2006;Georgoulis, 2012;McAteer et al, 2005McAteer et al, , 2010Dimitropoulou et al, 2009;Conlon et al, 2008;Chapman et al, 2008;Kiyani et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Evolution of fractality in space plasmas of interest to geomagnetic activity

Muñoz

Domínguez

Valdivia

et al. 2018

Nonlin. Processes Geophys.

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Abstract. We studied the temporal evolution of fractality for geomagnetic activity, by calculating fractal dimensions from the Dst data and from a magnetohydrodynamic shell model for turbulent magnetized plasma, which may be a useful model to study geomagnetic activity under solar wind forcing. We show that the shell model is able to reproduce the relationship between the fractal dimension and the occurrence of dissipative events, but only in a certain region of viscosity and resistivity values. We also present preliminary results of the application of these ideas to the study of the magnetic field time series in the solar wind during magnetic clouds, which suggest that it is possible, by means of the fractal dimension, to characterize the complexity of the magnetic cloud structure.

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The magnetosphere as a complex system

Cited by 33 publications

References 43 publications

Recurrence‐Based Quantification of Dynamical Complexity in the Earth's Magnetosphere at Geospace Storm Timescales

Recurrence‐Based Quantification of Dynamical Complexity in the Earth's Magnetosphere at Geospace Storm Timescales

Spatial distribution of the eddy diffusion coefficients in the plasma sheet during quiet time and substorms from THEMIS satellite data

Evolution of fractality in space plasmas of interest to geomagnetic activity

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