Nonlinear kinetic Alfvén wave with Poisson equation correction in the low aurora
Wang, De Yu ; Huang, Guang Li ; Fälthammar, C. -G. ; Lindqvist, P. A. ; Blomberg, L. ; Song, Li Ting
Springer
Published 1996
Springer
Published 1996
| ISSN: |
1572-946X
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|---|---|
| Source: |
Springer Online Journal Archives 1860-2000
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| Topics: |
Physics
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| Notes: |
Abstract Nonlinear kinetic Alfvén waves where β≪m e /m i , have been solved both with and without the Poisson equation correction. It is found that the ratio of the perpendicular electric field and magnetic field, and the ratio of parallel and perpendicular electric field increase with deepening of the depressive density soliton. The former ratio may be larger than the Alfvén velocity in the case of a large amplitude solitary kinetic Alfvén wave. The Poisson equation correction is important for the nonlinear kinetic Alfvén wave propagating along the magnetic field, which solves a puzzle of Sagdeev potential to approach infinity in the limit ofK x → 0. This correction causes the solitary KAW possessing an electrostatic character along the direction of wave moving frame. These results have been compared with the observations from the Freja satellite in the low aurora.
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| Type of Medium: |
Electronic Resource
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| URL: |