Fractal time statistics of AE-index burst waiting times: evidence of metastability

Consolini, Giuseppe; Michelis, Paola De

doi:10.5194/npg-9-419-2002

Cited by 26 publications

(15 citation statements)

References 26 publications

(34 reference statements)

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“…For instance, Balasis et al (2006) have shown the occurrence of an interesting transition from the anti-persistent to the persistent character in the fluctuations of Dst index, which closely corresponds to a transition from a regime of quiet to one of high magnetospheric activity, characterized by the occurrence of intense geomagnetic storms. A similar behavior has been also documented in the case of the auroral electrojet (AE) index (e.g., Uritsky and Pudovkin,and discussed in a more general scenario, involving a near forced and/or self-organized criticality (FSOC) dynamics (Consolini, 1997;Uritsky and Pudovkin, 1998;Chang, 1999;Chang et al, 2003;Consolini and Chang, 2001;Consolini and De Michelis, 2002;Wanliss and Weygand, 2007;Wanliss and Uritsky, 2010).…”

Section: Introductionmentioning

confidence: 82%

Intermittency and multifractional Brownian character of geomagnetic time series

Consolini

Marco

Michelis

2013

Nonlin. Processes Geophys.

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The Earth's magnetosphere exhibits a complex behavior in response to the solar wind conditions. This behavior, which is described in terms of mutifractional Brownian motions, could be the consequence of the occurrence of dynamical phase transitions. On the other hand, it has been shown that the dynamics of the geomagnetic signals is also characterized by intermittency at the smallest temporal scales. Here, we focus on the existence of a possible relationship in the geomagnetic time series between the multifractional Brownian motion character and the occurrence of intermittency. In detail, we investigate the multifractional nature of two long time series of the horizontal intensity of the Earth's magnetic field as measured at L'Aquila Geomagnetic Observatory during two years (2001 and 2008), which correspond to different conditions of solar activity. We propose a possible double origin of the intermittent character of the small-scale magnetic field fluctuations, which is related to both the multifractional nature of the geomagnetic field and the intermittent character of the disturbance level. Our results suggest a more complex nature of the geomagnetic response to solar wind changes than previously thought

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Section: Introductionmentioning

confidence: 82%

Intermittency and multifractional Brownian character of geomagnetic time series

Consolini

Marco

Michelis

2013

Nonlin. Processes Geophys.

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“…Intuitively an intermittent signal will exhibit peaks spaced apart by long distances/intervals. The study of the distribution of the waiting time or burst time has for example gained much attention in research about the solar wind-magnetosphere-ionosphere system [e.g., Freeman et al, 2000;Lui et al, 2000;Chapman and Watkins, 2001;Consolini and De Michelis, 2002] in relation to Self-Organized Criticality (SOC) states, which can naturally drive a system "scale free" (self-similar), the latter being a characteristic of turbulence [Bak et al, 1987]. The study of SOC systems is outside of the scope of this paper, and we only mention here that the duration of events in a scale-invariant processes are expected to follow a power law [e.g., Bak et al, 1987;Chang, 1992].…”

Section: Waiting Time Statisticsmentioning

confidence: 99%

Plasma turbulence and coherent structures in the polar cap observed by the ICI‐2 sounding rocket

et al. 2015

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The electron density data from the ICI‐2 sounding rocket experiment in the high‐latitude F region ionosphere are analyzed using the higher‐order spectra and higher‐order statistics. Two regions of enhanced fluctuations are chosen for detailed analysis: the trailing edge of a polar cap patch and an electron density enhancement associated with particle precipitation. While these two regions exhibit similar power spectra, our analysis reveals that their internal structures are significantly different. The structures on the edge of the polar cap patch are likely due to nonlinear wave interactions since this region is characterized by intermittency and significant coherent mode coupling. The plasma enhancement subjected to precipitation, however, exhibits stronger random characteristics with uncorrelated phases of density fluctuations. These results suggest that particle precipitation plays a fundamental role in ionospheric plasma structuring creating turbulent‐like structures. We discuss the physical mechanisms that cause plasma structuring as well as the possible processes for the low‐frequency part of the spectrum in terms of plasma instabilities.

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“…In this framework, magnetic substorms are better described in terms of noise-induced topological transitions in an extended out-of-equilibrium system. In other words, the magnetic substorm is the set of phenomena during which a reduction in topological complexity takes place (Chang, 2001a(Chang, , 2001bChang, 2001, 2002;Consolini and De Michelis, 2002). The role of the solar wind driver would be to enhance the internal noise (i.e.…”

Section: On the Transition From The Anti-persistent To Persistent Regimementioning

confidence: 99%

From pre-storm activity to magnetic storms: a transition described in terms of fractal dynamics

Balasis

Daglis²,

Kapiris³

et al. 2006

Ann. Geophys.

102

126

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Abstract. We show that distinct changes in scaling parameters of the D st index time series occur as an intense magnetic storm approaches, revealing a gradual reduction in complexity. The remarkable acceleration of energy release -manifested in the increase in susceptibility -couples to the transition from anti-persistent (negative feedback) to persistent (positive feedback) behavior and indicates that the occurence of an intense magnetic storm is imminent. The main driver of the D st index, the V B South electric field component, does not reveal a similar transition to persistency prior to the storm. This indicates that while the magnetosphere is mostly driven by the solar wind the critical feature of persistency in the magnetosphere is the result of a combination of solar wind and internal magnetospheric activity rather than solar wind variations alone. Our results suggest that the development of an intense magnetic storm can be studied in terms of "intermittent criticality" that is of a more general character than the classical self-organized criticality phenomena, implying the predictability of the magnetosphere.

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Fractal time statistics of AE-index burst waiting times: evidence of metastability

Cited by 26 publications

References 26 publications

Intermittency and multifractional Brownian character of geomagnetic time series

Intermittency and multifractional Brownian character of geomagnetic time series

Plasma turbulence and coherent structures in the polar cap observed by the ICI‐2 sounding rocket

From pre-storm activity to magnetic storms: a transition described in terms of fractal dynamics

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