Drift Orbits in Equilibrium Plasmas

2013 ◽  
pp. 93-120
Author(s):  
Sadrilla Abdullaev
Keyword(s):  
Drift Orbits

Universal scaling of thin current sheets in space plasma

2021 ◽  
Author(s):  
Helmi Malova ◽  
Lev Zelenyi ◽  
Elena Grigorenko ◽  
Victor Popov ◽  
Eduard Dubinin
Keyword(s):  
Hybrid Approach ◽  
Russian Science ◽  
Current Sheets ◽  
Scale Free ◽  
Universal Scaling ◽  
Magnetic Field Profile ◽  
Electron Sheet ◽  
Nonlinear Character ◽  
Drift Orbits ◽  
Universal Expression

<p>Thin current sheets (TCSs) with thicknesses about ion Larmor radii can play the key role in space; particularly they can store and then explosively release the accumulated free energy. The dynamics of ions moving along quasi-adiabatic trajectories in TCSs is different from one of magnetized electrons following guiding center drift orbits. Due to this property TCSs can be described in a frame of a hybrid approach. The thickness of the super-thin embedded electron sheet remains uncertain because of the scale-free character of magnetized electron motion. We propose a new analytical approach to describe the multilayer TCS and provide the universal expression describing the embedded electron sheet as a function of the cross-sheet transversal coordinate z characterizing TCS. We demonstrated that the unique property of the electron sheet is the nonlinear character of magnetic field profile:  <em>B(z) ~ z <sup>1/3 </sup></em>which conforms excellently with MAVEN observations in the Martian magnetotail. </p><p>This work was supported by the Russian Science Foundation (grant # 20-42-04418).</p><p> </p>

scholarly journals Generation of Vortex Lattices at the Liquid–Gas Interface Using Rotating Surface Waves

Fluids ◽  
2019 ◽  
Vol 4 (2) ◽  
pp. 74 ◽  
Author(s):  
Hua Xia ◽  
Nicolas Francois ◽  
Jean-Baptiste Gorce ◽  
Horst Punzmann ◽  
Michael Shats
Keyword(s):  
Relative Phase ◽  
Liquid Surface ◽  
Standing Waves ◽  
Stokes Drift ◽  
Vortex Lattices ◽  
Rotating Surface ◽  
A Cell ◽  
Drift Orbits ◽  
Vortex Crystal ◽  
The Waves

In this paper, we demonstrate experimentally that by generating two orthogonal standing waves at the liquid surface, one can control the motion of floating microparticles. The mechanism of the vortex generation is somewhat similar to a classical Stokes drift in linear progression waves. By adjusting the relative phase between the waves, it is possible to generate a vortex lattice, seen as a stationary horizontal flow consisting of counter-rotating vortices. Two orthogonal waves which are phase-shifted by π / 2 create locally rotating waves. Such waves induce nested circular drift orbits of the surface fluid particles. Such a configuration allows for the trapping of particles within a cell of the size about half the wavelength of the standing waves. By changing the relative phase, it is possible to either create or to destroy the vortex crystal. This method creates an opportunity to confine surface particles within cells, or to greatly increase mixing of the surface matter over the wave field surface.

Drift orbits for families of twist maps of the annulus

2007 ◽  
Vol 27 (03) ◽  
pp. 869 ◽  
Author(s):  
PATRICE LE CALVEZ
Keyword(s):  
Twist Maps ◽  
Drift Orbits

Special Inclinations Allowing Minimal Drift Orbits for Formation Flying Satellites

2008 ◽  
Vol 31 (1) ◽  
pp. 94-100 ◽  
Author(s):  
M. Sabatini ◽  
D. Izzo ◽  
R. Bevilacqua
Keyword(s):  
Formation Flying ◽  
Drift Orbits

Solar wind contribution to the average population of energetic He+ and He++ ions in the Earth's magnetosphere

1994 ◽  
Vol 12 (2/3) ◽  
pp. 152-168 ◽  
Author(s):  
G. Kremser ◽  
R. Rasinkangas ◽  
P. Tanskanen ◽  
B. Wilken ◽  
G. Gloeckler
Keyword(s):  
Solar Wind ◽  
Plasma Sheet ◽  
Ring Current ◽  
Activity Index ◽  
Outer Part ◽  
Exchange Processes ◽  
Plausible Mechanism ◽  
Drift Orbits ◽  
Considerable Doubt

Abstract. Measurements with the ion charge-energy-mass spectrometer CHEM on the AMPTE/CCE spacecraft were used to investigate the origin of energetic He+ and He++ ions observed in the equatorial plane at 3 ≤ L ≤ 9. Special emphasis was laid on the dependence of long-term average distributions on magnetic local time (MLT) and the geomagnetic activity index Kp. The observations are described in terms of the phase space densities f1 (for He+) and f2 (for He++). They confirm preliminary results from a previous study: f1 is independent of MLT, whereas f2 is much larger on the nightside than on the dayside. They show, furthermore, that f1 increases slightly with Kp on intermediate drift shells, but decreases on high drift shells (L ≥ 7). f2 increases with Kp on all drift shells outside the premidnight sector. Within this sector a decrease is observed on high drift shells. A simple ion tracing code was developed to determine how and from where the ions move into the region of observations. It provides ion trajectories as a function of the ion charge, the magnetic moment and Kp. The ion tracing enables a distinction between regions of closed drift orbits (ring current) and open convection trajectories (plasma sheet). It also indicates how the outer part of the observation region is connected to different parts of the more distant plasma sheet. Observations and tracing show that He++ ions are effectively transported from the plasma sheet on convection trajectories. Their distribution in the observation region corresponds to the distribution of solar wind ions in the plasma sheet. Thus, energetic He++ ions most likely originate in the solar wind. On the other hand, the plasma sheet is not an important source of energetic He+ ions. Convection trajectories more likely constitute a sink for He+ ions, which may diffuse onto them from closed drift orbits and then get lost through the magnetopause. An ionospheric origin of energetic He+ ions is unlikely as well, since the source mechanism should be almost independent of Kp. There is considerable doubt, however, that a plausible mechanism also exists during quiet periods that can accelerate ions to ring current energies, while extracting them from the ionosphere. It is concluded, therefore, that energetic He+ ions are mainly produced by charge exchange processes from He++ ions. This means that most of the energetic He+ ions constituting the average distributions also very likely originate in the solar wind. Additional ionospheric contributions are possible during disturbed periods.

scholarly journals Energetic electron transport in the presence of magnetic perturbations in magnetically confined plasmas

2015 ◽  
Vol 81 (5) ◽  
Author(s):  
G. Papp ◽  
M. Drevlak ◽  
G. I. Pokol ◽  
T. Fülöp
Keyword(s):  
Test Particle ◽  
Energetic Electron ◽  
Three Dimensional ◽  
Confined Plasmas ◽  
Magnetically Confined ◽  
Magnetic Perturbations ◽  
Open Region ◽  
Particle Simulations ◽  
Drift Orbits ◽  
Magnetically Confined Plasmas

The transport of energetic electrons is sensitive to magnetic perturbations. By using three-dimensional numerical simulation of test particle drift orbits we show that the transport of untrapped electrons through an open region with magnetic perturbations cannot be described by a diffusive process. Based on our test particle simulations, we propose a model that leads to an exponential loss of particles.

Runaway electron drift orbits in magnetostatic perturbed fields

2011 ◽  
Vol 51 (4) ◽  
pp. 043004 ◽  
Author(s):  
G. Papp ◽  
M. Drevlak ◽  
T. Fülöp ◽  
P. Helander
Keyword(s):  
Runaway Electron ◽  
Electron Drift ◽  
Drift Orbits
Sign in / Sign up

Export Citation Format

Share Document