Effect of nonzero dawn–dusk magnetic field component on particle acceleration in three-dimensional geomagnetic reconnection

2001 ◽  
Vol 8 (9) ◽  
pp. 4163-4173 ◽  
Author(s):  
E. Lee ◽  
D.-Y. Lee ◽  
K. W. Min ◽  
J. Seon
Keyword(s):  
Magnetic Field ◽  
Particle Acceleration ◽  
Field Component ◽  
Three Dimensional ◽  
Magnetic Field Component

Effects of the axial magnetic field component on the electron trajectory in the wiggler section

1998 ◽  
Vol 34 (5) ◽  
pp. 3467-3470
Author(s):  
A.C.C. Migliano ◽  
A.C.J. Paes ◽  
Y.C. De Polli ◽  
C.R.S. Stopa ◽  
J.R. Cardoso
Keyword(s):  
Magnetic Field ◽  
Field Component ◽  
Axial Magnetic Field ◽  
Magnetic Field Component ◽  
Electron Trajectory

scholarly journals MHD aspect of current sheet oscillations related to magnetic field gradients

2009 ◽  
Vol 27 (1) ◽  
pp. 417-425 ◽  
Author(s):  
N. V. Erkaev ◽  
V. S. Semenov ◽  
I. V. Kubyshkin ◽  
M. V. Kubyshkina ◽  
H. K. Biernat
Keyword(s):  
Magnetic Field ◽  
Current Sheet ◽  
Field Component ◽  
Short Wave ◽  
Magnetic Field Component ◽  
Wave Number ◽  
Dispersion Function ◽  
Small Scale ◽  
Magnetic Field Gradients ◽  
Normal Magnetic Field

Abstract. One-fluid ideal MHD model is applied for description of current sheet flapping disturbances appearing due to a gradient of the normal magnetic field component. The wave modes are studied which are associated to the flapping waves observed in the Earth's magnetotail current sheet. In a linear approximation, solutions are obtained for model profiles of the electric current and plasma densities across the current sheet, which are described by hyperbolic functions. The flapping eigenfrequency is found as a function of wave number. For the Earth's magnetotail conditions, the estimated wave group speed is of the order of a few tens kilometers per second. The current sheet can be stable or unstable in dependence on the direction of the gradient of the normal magnetic field component. The obtained dispersion function is used for calculation of the flapping wave disturbances, which are produced by the given initial Gaussian perturbation at the center of the current sheet and propagating towards the flanks. The propagating flapping pulse has a smooth leading front, and a small scale oscillating trailing front, because the short wave oscillations propagate much slower than the long wave ones.

scholarly journals Magnetopause current as seen by Cluster

2005 ◽  
Vol 23 (3) ◽  
pp. 901-907 ◽  
Author(s):  
M. W. Dunlop ◽  
A. Balogh
Keyword(s):  
Magnetic Field ◽  
Electric Current ◽  
Large Scale ◽  
Field Component ◽  
Accurate Determination ◽  
Field Measurements ◽  
Magnetic Field Component ◽  
Boundary Crossing ◽  
Current Layer

Abstract. The four-spacecraft, magnetic field measurements on Cluster can be combined to produce an accurate determination of the electric current in the magnetopause boundary during stable magnetopause crossings. For events that are planar on the scale of the spacecraft configuration, the thickness of the current layer can be accurately estimated from its magnetic profile at each spacecraft and the corresponding boundary crossing times. The latter, give a determination of boundary motion relative to the Cluster array. We use the estimates of all these properties, for a range of spacecraft separation distances, to show, firstly, that the estimate of electric current density is representative even when the spatial scale of the configuration of Cluster spacecraft approaches the thickness of the current layer. Secondly, we show that the estimated current lies in the plane of the boundary and demonstrate this for crossings occurring during large-scale ripples on the magnetopause. Thirdly, we show that the magnitude of the current is accurately represented, averaged over the extent of the current layer, by comparing to the change in the boundary-parallel magnetic field component divided by the estimated current layer thickness. We demonstrate this last point using a range of crossings each having a different thickness and crossing speed, different changes in the magnetic field component and different current densities.

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