Magnetic Fields in Diffuse Media

Lazarian, A.; Pino, E. M. de Gouveia Dal; Melioli, C.

doi:10.1007/978-3-662-44625-6

Cited by 21 publications

(3 citation statements)

References 717 publications

(1,114 reference statements)

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“…The deviations depend on the energy and charge of the cosmic ray: while at energies above 50 EeV they may be of order of a few degrees in the case of protons, such deviations would be much larger for nuclei of the same energy but having a larger charge. This situation is further complicated by the facts that there are still large uncertainties in the modeling of magnetic fields (see [12,13] and references therein) and that the UHECR mass composition at energies above 50 EeV is still largely unexplored [14,15].…”

Section: Jcap01(2016)037mentioning

confidence: 99%

“…The regular part of the Galactic magnetic field is expected to give a dominant contribution to the UHECR deflections. There are several models of the regular Galactic field in the literature (see, e.g., [13] for a recent review). While the averages of the magnitudes of the deflections across the sky predicted in these models are similar, individual deflections in a given direction of the sky vary substantially, so that reliable predictions have not yet been achieved.…”

Section: Magnetic Deflections Of Uhecrsmentioning

confidence: 99%

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Search for correlations between the arrival directions of IceCube neutrino events and ultrahigh-energy cosmic rays detected by the Pierre Auger Observatory and the Telescope Array

2016

J. Cosmol. Astropart. Phys.

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Abstract. This paper presents the results of different searches for correlations between very high-energy neutrino candidates detected by IceCube and the highest-energy cosmic rays measured by the Pierre Auger Observatory and the Telescope Array. We first consider samples of cascade neutrino events and of high-energy neutrino-induced muon tracks, which provided evidence for a neutrino flux of astrophysical origin, and study their cross-correlation with the ultrahigh-energy cosmic ray (UHECR) samples as a function of angular separation. We also study their possible directional correlations using a likelihood method stacking the neutrino arrival directions and adopting different assumptions on the size of the UHECR magnetic deflections. Finally, we perform another likelihood analysis stacking the UHECR directions and using a sample of through-going muon tracks optimized for neutrino point-source searches with sub-degree angular resolution. No indications of correlations at discovery level are obtained for any of the searches performed. The smallest of the p-values comes from the search for correlation between UHECRs with IceCube high-energy cascades, a result that should continue to be monitored.

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Section: Jcap01(2016)037mentioning

confidence: 99%

Section: Magnetic Deflections Of Uhecrsmentioning

confidence: 99%

Search for correlations between the arrival directions of IceCube neutrino events and ultrahigh-energy cosmic rays detected by the Pierre Auger Observatory and the Telescope Array

2016

J. Cosmol. Astropart. Phys.

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“…Magnetic reconnection is a ubiquitous phenomenon in solar, space, astrophysical and laboratory plasmas, and now considered to be "among the most fundamental unifying concepts in astrophysics, comparable in scope and importance to the role of natural selection in biology." (Moore et al, 2015): see authoritative discussions of 'classical' reconnection in Schindler (2007); Priest and Forbes (2000); Biskamp (2000); ; on modern theories of 'fast' reconnection and 'turbulent/stochastic reconnection' in Lazarian et al (2015); Loureiro and Uzdensky (2016); and 'fractal reconnection' in Shibata and Tanuma (2001). The literature on the topic is vast and there are many complex concepts to consider regarding the precise mathematical definition (e.g.…”

Section: Magnetic Reconnectionmentioning

confidence: 99%

Theory of one-dimensional Vlasov-Maxwell equilibria: with applications to collisionless current sheets and flux tubes

Allanson

2017

Preprint

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Vlasov-Maxwell equilibria are characterised by the self-consistent descriptions of the steady-states of collisionless plasmas in particle phase-space, and balanced macroscopic forces. We study the theory of Vlasov-Maxwell equilibria in one spatial dimension, as well as its application to current sheet and flux tube models.The 'inverse problem' is that of determining a Vlasov-Maxwell equilibrium distribution function self-consistent with a given magnetic field. We develop the theory of inversion using expansions in Hermite polynomial functions of the canonical momenta. Sufficient conditions for the convergence of a Hermite expansion are found, given a pressure tensor. For large classes of DFs, we prove that nonnegativity of the distribution function is contingent on the magnetisation of the plasma, and make conjectures for all classes.The inverse problem is considered for nonlinear 'force-free Harris sheets'. By applying the Hermite method, we construct new models that can describe sub-unity values of the plasma beta (β pl ) for the first time. Whilst analytical convergence is proven for all β pl , numerical convergence is attained for β pl = 0.85, and then β pl = 0.05 after a 're-gauging' process.We consider the properties that a pressure tensor must satisfy to be consistent with 'asymmetric Harris sheets', and construct new examples. It is possible to analytically solve the inverse problem in some cases, but others must be tackled numerically. We present new exact Vlasov-Maxwell equilibria for asymmetric current sheets, which can be written as a sum of shifted Maxwellian distributions. This is ideal for implementations in particle-in-cell simulations.We study the correspondence between the microscopic and macroscopic descriptions of equilibrium in cylindrical geometry, and then attempt to find Vlasov-Maxwell equilibria for the nonlinear force-free 'Gold-Hoyle' model. However, it is necessary to include a background field, which can be arbitrarily weak if desired. The equilibrium can be electrically non-neutral, depending on the bulk flows.

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Introduction

Allanson¹

2018

Theory of One-Dimensional Vlasov-Maxwell Equilibria

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Magnetic Fields in Diffuse Media

Cited by 21 publications

References 717 publications

Search for correlations between the arrival directions of IceCube neutrino events and ultrahigh-energy cosmic rays detected by the Pierre Auger Observatory and the Telescope Array

Search for correlations between the arrival directions of IceCube neutrino events and ultrahigh-energy cosmic rays detected by the Pierre Auger Observatory and the Telescope Array

Theory of one-dimensional Vlasov-Maxwell equilibria: with applications to collisionless current sheets and flux tubes

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