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|Type:||Artigo de periódico|
|Title:||A nonlinear model for auroral density cavities|
|Abstract:||A nonlinear model for the short-scale auroral density, cavity (SSADC) is presented. Specifically, it is shown that the SSADC is associated with nonlinear : Short wavelength (in comparison with the collisionless electron skin depth) dispersive convective cells (DCCs) whose frequencies are much smaller than the ion gyrofrequency. In a stationary frame, the relevant equations governing the dynamics of the nonlinear DCCs are put in: the form of an energy integral with an effective potential. The latter is analyzed to demonstrate the existence of density cavities (or holes). Larger amplitude. cavities are necessarily quasi-stationary. The present theoretical model is capable of describing the salient features of SSADCs that are seen in data from the Freja satellite.|
|Editor:||Amer Geophysical Union|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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