Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/66935
Type: Artigo de periódico
Title: FIELD-ALIGNED CURRENT MODEL FOR ULTRALOW-FREQUENCY PULSATIONS IN THE AURORAL REGION
Author: ELIAS, C
DEASSIS, AS
DEAZEVEDO, CA
SHIGUEOKA, H
DEAZEVEDO, MT
SAKANAKA, PH
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
Rights: embargo
Identifier DOI: 10.1029/93JA02542
Date Issue: 1994
Appears in Collections:Unicamp - Artigos e Outros Documentos

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