scholarly journals Shear AlfvéN waves on stretched magnetic field lines near midnight in Earth's magnetosphere

2000 ◽  
Vol 27 (20) ◽  
pp. 3265-3268 ◽  
Author(s):  
R. Rankin ◽  
F. Fenrich ◽  
V. T. Tikhonchuk
Keyword(s):  
Magnetic Field ◽  
Alfven Waves ◽  
Alfvén Waves ◽  
Earth’S Magnetosphere ◽  
Earth's Magnetosphere ◽  
Field Lines ◽  
Shear Alfven Waves

Nonlinear standing shear Alfvén waves in the Earth's magnetosphere

1994 ◽  
Vol 99 (A11) ◽  
pp. 21291 ◽  
Author(s):  
R. Rankin ◽  
P. Frycz ◽  
V. T. Tikhonchuk ◽  
J. C. Samson
Keyword(s):  
Alfven Waves ◽  
Alfvén Waves ◽  
Earth’S Magnetosphere ◽  
Earth's Magnetosphere ◽  
Shear Alfven Waves

The α-effect generated by standing Alfvén waves

1988 ◽  
Vol 40 (2) ◽  
pp. 353-358 ◽  
Author(s):  
Tomikazu Namikawa ◽  
Hiromitsu Hamabata
Keyword(s):  
Magnetic Field ◽  
Electromotive Force ◽  
Particle Flux ◽  
Alfven Waves ◽  
Alfvén Waves ◽  
Earth’S Magnetosphere ◽  
Earth's Magnetosphere ◽  
The Mean

The mean electromotive force generated by nonlinear standing Alfvén waves propagating along the mean magnetic field is investigated. It is shown that the α-effect can exist owing to the interaction between oppositely propagating two waves, provided that the initial fields have non-zero helicity. The result is discussed in the context of field-aligned currents and periodic particle flux variations in the earth's magnetosphere.

scholarly journals Electron dynamics during substorm dipolarization in Mercury's magnetosphere

2005 ◽  
Vol 23 (10) ◽  
pp. 3389-3398 ◽  
Author(s):  
D. C. Delcourt ◽  
K. Seki ◽  
N. Terada ◽  
Y. Miyoshi
Keyword(s):  
Magnetic Field ◽  
High Energy ◽  
Expansion Phase ◽  
Earth’S Magnetosphere ◽  
High Energy Electrons ◽  
Earth's Magnetosphere ◽  
Magnetic Field Model ◽  
Particle Simulations ◽  
Field Lines ◽  
The Magnetic Field

Abstract. We examine the nonlinear dynamics of electrons during the expansion phase of substorms at Mercury using test particle simulations. A simple model of magnetic field line dipolarization is designed by rescaling a magnetic field model of the Earth's magnetosphere. The results of the simulations demonstrate that electrons may be subjected to significant energization on the time scale (several seconds) of the magnetic field reconfiguration. In a similar manner to ions in the near-Earth's magnetosphere, it is shown that low-energy (up to several tens of eV) electrons may not conserve the second adiabatic invariant during dipolarization, which leads to clusters of bouncing particles in the innermost magnetotail. On the other hand, it is found that, because of the stretching of the magnetic field lines, high-energy electrons (several keVs and above) do not behave adiabatically and possibly experience meandering (Speiser-type) motion around the midplane. We show that dipolarization of the magnetic field lines may be responsible for significant, though transient, (a few seconds) precipitation of energetic (several keVs) electrons onto the planet's surface. Prominent injections of energetic trapped electrons toward the planet are also obtained as a result of dipolarization. These injections, however, do not exhibit short-lived temporal modulations, as observed by Mariner-10, which thus appear to follow from a different mechanism than a simple convection surge.

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