Origin of multifractality in solar wind turbulence: the role of current sheets

Gomes, Leonardo Fernandes; Gomes, Tiago F P; Rempel, Erico L.; Gama, S.

doi:10.1093/mnras/stac3577

Cited by 8 publications

(4 citation statements)

References 53 publications

(67 reference statements)

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“…However, Gaussian random fields can only provide a low-order approximation of magnetic turbulence, neglecting any structure beyond two-point correlations captured by the energy spectrum. They do not exhibit intermittency as observed in first-principles turbulence (e.g., [14][15][16][17]). Intermittency was studied in the context of hydrodynamic synthetic turbulence models already by Juneja et al [18], and its impact on charged particle transport more recently by Pucci et al [19] and Shukurov et al [20], finding faster diffusion in structured magnetic fields.…”

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confidence: 81%

Towards synthetic magnetic turbulence with coherent structures

Lübke,

Effenberger,

Wilbert

et al. 2024

EPL

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Synthetic turbulence is a relevant tool to study complex astrophysical and space plasma environments inaccessible by direct simulation. However, conventional models lack intermittent coherent structures, which are essential in realistic turbulence. We present a novel method featuring coherent structures, conditional structure function scaling and fieldline curvature statistics comparable to magnetohydrodynamic turbulence. Enhanced transport of charged particles is investigated as well. This method presents significant progress towards physically faithful synthetic turbulence.

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mentioning

confidence: 81%

Towards synthetic magnetic turbulence with coherent structures

Lübke,

Effenberger,

Wilbert

et al. 2024

EPL

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“…Shuffling the data destroys all the long-range correlations while the PDF remains unchanged. On the other hand, multifractality due to a heavy-tailed PDF cannot be removed by shuffling [57]. If the multifractality is solely due to correlations, the shuffled data will show monofractality [57].…”

Section: Origin Of the Multifractal Naturementioning

confidence: 99%

“…On the other hand, multifractality due to a heavy-tailed PDF cannot be removed by shuffling [57]. If the multifractality is solely due to correlations, the shuffled data will show monofractality [57]. If the data contains both heavy-tailed PDF and linear/nonlinear correlations, then the shuffled data will show multifractality smaller than that of the original data [58].…”

Section: Origin Of the Multifractal Naturementioning

confidence: 99%

Analysis of the structural complexity of Crab Nebula observed at radio frequency using a multifractal approach

Langlen Chanu,

Chingangbam,

Rahman

et al. 2024

J. Phys. Complex.

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The Crab nebula is an astrophysical system that exhibits complex morphological patterns at different observing frequencies. We carry out a systematic investigation of the structural complexity of the nebula using publicly available imaging data at radio frequency. For the analysis, we use the well-known multifractal detrended fluctuation analysis (MFDFA) in two dimensions. We find that radio data exhibit long-range correlations, as expected from the underlying physics of the supernova explosion and evolution. The correlations follow a power-law scaling with length scales. The structural complexity is found to be multifractal in nature, as evidenced by the dependence of the generalized Hurst exponent on the order of the moments of the detrended fluctuation function. By repeating the analysis on shuffled data, we further probe the origin of the multifractality in the radio imaging data. For the radio data, we find that the probability density function (PDF) is close to a Gaussian form, and hence the multifractal behaviour is due to the differing nature of long-range correlations of the large and small detrended fluctuation field values. We investigate the multifractal parameters across different partitions of the radio image and find that the structures across the image are highly heterogenous making the Crab nebula a structurally complex astrophysical system. Our analysis thus provides a fresh perspective on the morphology of the Crab nebula from a complexity science viewpoint.

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“…Thus, in our solar plasma model, the EiBI theory could be taken fruitfully to explain solar plasma dynamics in the light of the post-Newtonian formalism of modern gravitational scenario. Besides, investigation of the magnetoactive solar wind turbulence properties in the multifractal perspective sourced in longrange interspecies correlation effects could be an effective study in this context for a better understanding of the entire solar plasma system and helioseismic collective wave-phenomenological features (Gomes et al 2023 ).…”

Section: O N C L U S I O N Smentioning

confidence: 99%

A theoretic analysis of magnetoactive GES-based turbulent solar plasma instability

DAS

Atteya

Karmakar

2023

Monthly Notices of the Royal Astronomical Society

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A recently reported Gravito-Electrostatic Sheath (GES) model is procedurally applied to study the turbumagnetoactive helioseismic oscillation features in the entire bi-fluidic solar plasma system (DAS & KARMAKAR, JOAA, 2022). The bounded Solar Interior Plasma (SIP, internally self-gravitating), and the unbounded Solar Wind Plasma (SWP, externally point-gravitating) are coupled through the interfacial diffused Solar Surface Boundary (SSB) due to an exact gravito-electrostatic interplay. A numerical platform on the developed theoretic formalism reveals the evolution of both dispersive and non-dispersive features of the modified GES mode fluctuations in new parametric windows. Different colourspectral profiles exhibit important features of the GES-based SIP-SWP perturbations elaborately. It is illustratively shown that the thermostatistical GES stability depends mainly on the radial distance, magnetic field, equilibrium plasma density, and plasma temperature. We see that their dispersive features are more pertinently pronounced in the self-gravitational domains (SIP) than the electrostatic counterparts (SWP). Besides, different characteristic parameters with accelerating (or decelerating) and stabilizing (or destabilizing) effects influencing the entire solar plasma stability are illustratively portrayed. We speculate that, in the SIP, the long-wave (gravitational-like) helioseismic fluctuations become highly dispersive showing more propagatory nature than the shorter ones (acoustic-like). The short-waves show more propagatory propensity than the longer ones in the SSB and SWP regime. The reliability of our proposed investigation is bolstered along with the tentative applicability and future scope in light of the current solar observational scenarios, such as SOHO, STEREO, SDO, PSP, SolO, etc.

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Origin of multifractality in solar wind turbulence: the role of current sheets

Cited by 8 publications

References 53 publications

Towards synthetic magnetic turbulence with coherent structures

Towards synthetic magnetic turbulence with coherent structures

Analysis of the structural complexity of Crab Nebula observed at radio frequency using a multifractal approach

A theoretic analysis of magnetoactive GES-based turbulent solar plasma instability

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