scholarly journals Turbulent field fluctuations in gyrokinetic and fluid plasmas

2021 ◽  
Vol 28 (11) ◽  
pp. 112301
Author(s):  
A. Mathews ◽  
N. Mandell ◽  
M. Francisquez ◽  
J. W. Hughes ◽  
A. Hakim
Keyword(s):  
Turbulent Field ◽  
Field Fluctuations

Fractality feature in incompressible three-dimensional magnetohydrodynamic turbulence

2008 ◽  
Vol 86 (10) ◽  
pp. 1203-1207
Author(s):  
M Momeni ◽  
M Moslehi-Fard
Keyword(s):  
Three Dimensional ◽  
Qualitative Change ◽  
Mhd Turbulence ◽  
Self Similarity ◽  
Simulation Data ◽  
Magnetohydrodynamic Turbulence ◽  
Exponential Tails ◽  
Turbulent Field ◽  
Field Fluctuations ◽  
52.35 Ra

High-resolution direct numerical simulation data for three-dimensional magnetohydrodynamic (MHD) turbulence based on the 10243-modes in a periodic box are used to study the statistical properties of turbulence. In this paper, the presence of intermittency in MHD turbulence is investigated through the analysis of the Probability Distribution Function (PDF) for Elsässer fields and total energy fluctuations. The energy PDFs exhibit similarity over all scales of the turbulent system since they show no substantial qualitative change in shape as the scale of the fluctuations varies. This is in sharp and surprising contrast to the well-known behavior of PDFs of turbulent field fluctuations of, for example, velocity, and magnetic and Elsässer fields. The PDFs have exponential tails and satisfy the function P(| δX |) ~ exp(–A | δX | μ). Numerically, we extract the exponent μ and find that it is constant for monofractal behavior as the scale of length varies. The compensated structure functions exhibit self-similarity for the respective fluctuations, and it is a reliable way in turbulence. PACS Nos.: 52.30.–q , 52.30.Cv , 52.35.Ra , 52.65.–y

Casimir forces and vacuum energy

2017 ◽  
Author(s):  
Serge Reynaud ◽  
Astrid Lambrecht
Keyword(s):  
Casimir Force ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Thermal Fluctuations ◽  
Model Systems ◽  
Vacuum Field ◽  
Force Measurements ◽  
Casimir Forces ◽  
Current State ◽  
Field Fluctuations

The Casimir force is an effect of quantum vacuum field fluctuations, with applications in many domains of physics. The ideal expression obtained by Casimir, valid for perfect plane mirrors at zero temperature, has to be modified to take into account the effects of the optical properties of mirrors, thermal fluctuations, and geometry. After a general introduction to the Casimir force and a description of the current state of the art for Casimir force measurements and their comparison with theory, this chapter presents pedagogical treatments of the main features of the theory of Casimir forces for one-dimensional model systems and for mirrors in three-dimensional space.

The simplest decomposition of a turbulent field

2012 ◽  
Vol 241 (3) ◽  
pp. 284-287 ◽  
Author(s):  
Massimo Germano
Keyword(s):  
Turbulent Field

Polarization pattern of low-frequency geomagnetic field fluctuations (0.8-3.6 mHz) at high and low latitude

1999 ◽  
Vol 104 (A1) ◽  
pp. 305-310 ◽  
Author(s):  
S. Lepidi ◽  
P. Francia ◽  
U. Villante ◽  
L. J. Lanzerotti ◽  
A. Meloni
Keyword(s):  
Geomagnetic Field ◽  
Low Frequency ◽  
Polarization Pattern ◽  
Low Latitude ◽  
Field Fluctuations

Scalar field fluctuations in the early universe

1988 ◽  
Vol 303 (4) ◽  
pp. 713-727 ◽  
Author(s):  
K. Enqvist ◽  
K.W. Ng ◽  
K.A. Olive
Keyword(s):  
Scalar Field ◽  
Early Universe ◽  
Field Fluctuations
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