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|Type:||Artigo de periódico|
|Title:||FIELD-ALIGNED CURRENT MODEL FOR ULTRALOW-FREQUENCY PULSATIONS IN THE AURORAL REGION|
|Abstract:||We have modeled the auroral magnetized plasma as an inhomogeneous current-carrying plasma and have shown that some features of the magnetic pulsations in that region not yet explained might be clarified by the discrete Alfven eigenmode propagation in that plasma. This mode has the frequency outside of the shear Alfven continuum, and it is a global mode rather then a localized Alfven noneigenmode in inhomogeneous media. Discrete Alfven waves are also described by the two-fluid model finite omega/omega(ci), where (omega(ci)) is the ion cyclotron frequency. In this paper we show that the current-carrying magnetic field tube in magnetosphere can sustain discrete Alfven modes whose frequency is compatible with the ultralow-frequency pulsations observed.|
|Editor:||Amer Geophysical Union|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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