On the chaotic nature of solar‐terrestrial environment: Interplanetary Alfvén intermittency

Chian, Abraham C.‐L.; Kamide, Y.; Rempel, Erico L.; Santana, W. M.

doi:10.1029/2005ja011396

Cited by 25 publications

(23 citation statements)

References 110 publications

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“…In particular, in agreement with other studies, we confirm the universal shape of the multifractal spectrum as noticed, e.g., by Burlaga (2001). Since the Cantor set is sensitive to initial conditions the multifractal spectrum for intermittent turbulence can be naturally related to the Lyapunov spectrum as discussed by Chian et al (2006). We have also calculated the degree of multifractality given in Eq.…”

Section: Resultssupporting

confidence: 75%

Asymmetric multifractal model for solar wind intermittent turbulence

Szczepaniak

Macek

2008

Nonlin. Processes Geophys.

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Abstract. We consider nonuniform energy transfer rate for solar wind turbulence depending on the solar cycle activity. To achieve this purpose we determine the generalized dimensions and singularity spectra for the experimental data of the solar wind measured in situ by Advanced Composition Explorer spacecraft during solar maximum (2001) and minimum (2006) at 1 AU. By determining the asymmetric singularity spectra we confirm the multifractal nature of different states of the solar wind. Moreover, for explanation of this asymmetry we propose a generalization of the usual so-called p-model, which involves eddies of different sizes for the turbulent cascade. Naturally, this generalization takes into account two different scaling parameters for sizes of eddies and one probability measure parameter, describing how the energy is transferred to smaller eddies. We show that the proposed model properly describes multifractality of the solar wind plasma.

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Section: Resultssupporting

confidence: 75%

Asymmetric multifractal model for solar wind intermittent turbulence

Szczepaniak

Macek

2008

Nonlin. Processes Geophys.

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“…Numerical simulations of nonlinear plasma waves have confirmed that intermittent events are localized regions of plasmas (or fluids) governed by bursts of energy spikes (phase coherent structures) where phase synchronization is operating (He andChian, 2003, 2005). Since large-amplitude coherent structures of small scales have typical lifetimes longer than that of small-amplitude incoherent (stochastic) fluctuations, the dynamics of an intermittent turbulence, ubiquitous in the heliophysical environment (Chian et al, 2006), is dominated by coherent structures resulting from phase synchronization.…”

Section: Resultsmentioning

confidence: 93%

Cluster and ACE observations of phase synchronization in intermittent magnetic field turbulence: a comparative study of shocked and unshocked solar wind

Chian

Miranda

2009

Ann. Geophys.

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Abstract. We apply two distinct nonlinear techniques, kurtosis and phase coherence index, to analyze the modulus of interplanetary magnetic field data |B| measured by Cluster and ACE spacecraft from 1 to 3 February 2002. High degree of phase synchronization is found across a wide range of time scales, from 1 s to 10 4 s, in the magnetic field fluctuations, both in the shocked solar wind upstream of Earth's bow shock and in the unshocked ambient solar wind at the L1 Lagrangian point. This is the first direct measurement of phase coherence in the ambient solar wind turbulence. We show that phase synchronization related to nonlinear multiscale interactions is the origin of the departure from Gaussianity in the intermittent magnetic field turbulence. In particular, we demonstrate that at small scales near the spectral break the intermittency level of Cluster is lower than ACE, which may be a signature of the reflected ions from the shock.

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“…While the Alfvénic fluctuations are geoeffective at the solar minimum phase, the magnetic structures play a role at the solar maximum phase. Chian et al (2006) among others, also suggested that a close correlation between interplanetary Alfvén waves and AE index exists.…”

Section: Introductionmentioning

confidence: 99%

The influence of solar wind turbulence on geomagnetic activity

Jankovičovà

Vörös

Šimkanin

2008

Nonlin. Processes Geophys.

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Abstract. The importance of space weather and its forecasting is growing as interest in studying geoeffective processes in the Sun -solar wind -magnetosphere -ionosphere coupled system is increasing. In this paper higher order statistical moments of interplanetary magnetic field and geomagnetic SYM-H index fluctuations are compared. The proper description of fluctuations in the solar wind can elucidate important aspects of the geoeffectivity of upstream turbulence and contribute to our understanding of space weather. Our results indicate that quasi-stationary intervals during both quiet and stormy periods have to be investigated in order to find correlations between upstream and geomagnetic conditions. We found that the fourth statistical moment (kurtosis), which was not considered in previous studies, appears to be a new geoeffective parameter. Intermittency of the magnetic turbulence in the solar wind can influence the efficiency of the solar wind -magnetosphere coupling through affecting magnetic reconnection at the Earth's magnetopause.

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On the chaotic nature of solar‐terrestrial environment: Interplanetary Alfvén intermittency

Cited by 25 publications

References 110 publications

Asymmetric multifractal model for solar wind intermittent turbulence

Asymmetric multifractal model for solar wind intermittent turbulence

Cluster and ACE observations of phase synchronization in intermittent magnetic field turbulence: a comparative study of shocked and unshocked solar wind

The influence of solar wind turbulence on geomagnetic activity

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