Turbulence in Space Plasmas

Cargill, P. J.; Vlahos, L.

doi:10.1007/978-3-642-00210-6

Cited by 3 publications

(1 citation statement)

References 34 publications

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“…where < > denotes an ensemble average of the increments of the variable taken over all pairs of points (x, x + x) separated by a scale x that quantifies the scale of interest. In the case of turbulent signals these quantities (S q ( x)) are representative of fluctuations at the scale x (Carbone & Pouquet, 2009). If the analyzed signal describes a system that meets the scale invariance properties, these structure functions will scale as…”

Section: Methods Of Analysismentioning

confidence: 99%

Scaling Features of High‐Latitude Geomagnetic Field Fluctuations at Swarm Altitude: Impact of IMF Orientation

et al. 2017

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This paper attempts to explore the statistical scaling features of high‐latitude geomagnetic field fluctuations at Swarm altitude. Data for this study are low‐resolution (1 Hz) magnetic data recorded by the vector field magnetometer on board Swarm A satellite over 1 year (from 15 April 2014 to 15 April 2015). The first‐ and second‐order structure function scaling exponents and the degree of intermittency of the fluctuations of the intensity of the horizontal component of the magnetic field at high northern latitudes have been evaluated for different interplanetary magnetic field orientations in the GSM Y‐Z plane and seasons. In the case of the first‐order structure function scaling exponent, a comparison between the average spatial distributions of the obtained values and the statistical convection patterns obtained using a Super Dual Auroral Radar Network dynamic model (CS10 model) has been also considered. The obtained results support the idea that the knowledge of the scaling features of the geomagnetic field fluctuations can help in the characterization of the different ionospheric turbulence regimes of the medium crossed by Swarm A satellite. This study shows that different turbulent regimes of the geomagnetic field fluctuations exist in the regions characterized by a double‐cell convection pattern and in those regions near the border of the convective structures.

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Section: Methods Of Analysismentioning

confidence: 99%

Scaling Features of High‐Latitude Geomagnetic Field Fluctuations at Swarm Altitude: Impact of IMF Orientation

et al. 2017

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In Situ Observation of Alfvén Waves in an ICME Shock-Sheath Indicating the Existence of Alfvénic Turbulence

Dhamane,

Raghav,

Shaikh

et al. 2024

Sol Phys

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Particle acceleration and transport in reconnecting twisted loops in a stratified atmosphere

Gordovskyy

Browning

Kontar

et al. 2014

A&A

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Context. Twisted coronal loops should be ubiquitous in the solar corona. Twisted magnetic fields contain excess magnetic energy, which can be released during magnetic reconnection, causing solar flares. Aims. The aim of this work is to investigate magnetic reconnection, and particle acceleration and transport in kink-unstable twisted coronal loops, with a focus on the effects of resistivity, loop geometry and atmospheric stratification. Another aim is to perform forward-modelling of bremsstrahlung emission and determine the structure of hard X-ray sources. Methods. We use a combination of magnetohydrodynamic (MHD) and test-particle methods. First, the evolution of the kinking coronal loop is considered using resistive MHD model, incorporating atmospheric stratification and loop curvature. Then, the obtained electric and magnetic fields and density distributions are used to calculate electron and proton trajectories using a guiding-centre approximation, taking into account Coulomb collisions. Results. It is shown that electric fields in twisted coronal loops can effectively accelerate protons and electrons to energies up to 10 MeV. High-energy particles have hard, nearly power-law energy spectra. The volume occupied by high-energy particles demonstrates radial expansion, which results in the expansion of the visible hard X-ray loop and a gradual increase in hard X-ray footpoint area. Synthesised hard X-ray emission reveals strong footpoint sources and the extended coronal source, whose intensity strongly depends on the coronal loop density.

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Turbulence in Space Plasmas

Cited by 3 publications

References 34 publications

Scaling Features of High‐Latitude Geomagnetic Field Fluctuations at Swarm Altitude: Impact of IMF Orientation

Scaling Features of High‐Latitude Geomagnetic Field Fluctuations at Swarm Altitude: Impact of IMF Orientation

In Situ Observation of Alfvén Waves in an ICME Shock-Sheath Indicating the Existence of Alfvénic Turbulence

Particle acceleration and transport in reconnecting twisted loops in a stratified atmosphere

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