Results 1 to 10 of about 9,065 (177)
Auroral electrojets and boundaries of plasma domains in the magnetosphere during magnetically disturbed intervals [PDF]
Annales Geophysicae, 2006 We investigate variations in the location and intensity of the auroral electrojets during magnetic storms and substorms using a numerical method for estimating the equivalent ionospheric currents based on data from meridian chains of magnetic ...
Y. I. Feldstein +8 more
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The Alfvén edge in asymmetric reconnection [PDF]
Annales Geophysicae, 2010 We show that in the case of magnetic reconnection where the Alfvén velocity is much higher in the plasma on one side of the current sheet than the other, an Alfvén edge is formed.
A. Vaivads +3 more
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Alfvén wave characteristics of equatorial plasma irregularities in the ionosphere derived from CHAMP observations [PDF]
Frontiers in Physics, 2014 We report magnetic field observations of the components transverse to the main field in the frequency range 1–25 Hz from times of equatorial plasma irregularity crossings. These field variations are interpreted as Alfvénic signatures accompanying intermediate-scale (150 m–4 km) plasma density depletions.
Lühr, H. +3 more
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Alfvén‐Fast Wave Coupling in a 2D Nonuniform Medium
Earth and Space Science, 2023 A 2D Cartesian simulation is presented and used to solve the ideal, low‐beta, linear magnetohydrodynamics equations. A simulation is used to investigate the propagation of Alfvén waves through inhomogeneities in Alfvén speed and density.
R. Davies, A. N. Wright
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Plasma Evolutions Around a Solar Coronal 3D Magnetic Null Point [PDF]
Iranian Journal of Astronomy and Astrophysics, 2021 It is investigated how the plasma evaluates due to the propagation of the nonlinear Alfven wave. Magnetic null points that are detected in the solar corona have 3D structures which are prevalent in the solar atmosphere.
Somaiyeh Sabri, Hossein Ebadi
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Solar-Terrestrial Physics, 2022 We have carried out a numerical analysis of the spatial structure of Alfvén waves in a finite pressure inhomogeneous plasma in a dipole model of the magnetosphere.
Petrashchuk A. V. +2 more
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Alfvén wave evolution into magnetic filaments in 3-D space plasma
Earth, Planets and Space, 2020 Nonlinearities in space and astrophysical plasmas generate a set of magnetic filaments or bundles that have an incompressible sense of fluctuations and propagate highly obliquely to the mean magnetic field.
Horia Comişel +2 more
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Non-linear spherical Alfvén waves
Monthly Notices of the Royal Astronomical Society, 1998 We present an one-dimensional numerical study of Alfven waves propagating along a radial magnetic field. Neglecting losses, any spherical Alfven wave, no matter how small its initial amplitude is, becomes nonlinear at sufficiently large radii. From previous simulations of Alfven waves in plane parallel atmospheres we did expect the waves to steepen and
Torkelsson, Ulf, Boynton, G. Christopher
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Alfvén Wave Connection between the Chromosphere and the Corona of the Sun: An Analytical Study
The Astrophysical Journal, 2023 Alfvén waves are closely relevant to the three outstanding problems in the solar corona: coronal heating, solar wind acceleration, and the fractionization of low first ionization potential (FIP) elements.
Jongchul Chae, Kyoung-Sun Lee
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The Alfvén resonator revisited [PDF]
Annales Geophysicae, 2010 Two models for a magnetosphere-ionosphere coupling feedback instability in the lower magnetosphere are studied. In both models the instability arises because of the generation of an Alfvén wave from growing arc-like structures in the ionospheric ...
A. M. Hamza, W. Lyatsky
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