Four-field model for dispersive field-line resonances: Effects of coupling between shear-Alfven and slow modes

A. Bhattacharjee, C. A. Kletzing, Z. W. Ma, C. S. Ng, N. F. Otani, X. Wang

Research output: Contribution to journalArticle

13 Scopus citations

Abstract

A new theoretical model is proposed for dispersive field-line resonances in collisionless magnetospheric plasmas on the basis of reduced four-field equations. The model improves upon the predictive capabilities of earlier two-field models. In particular, due to the coupling of the shear-Alfven mode to the slow mode in the four-field system, it is now possible to account for the observed low frequencies of field-line resonances. Furthermore, parallel electric fields can be large without requiring the field-aligned current density to be unrealistically large. Qualitative implications for recent FAST and ground-based observations are discussed.

Original languageEnglish (US)
Pages (from-to)3281-3284
Number of pages4
JournalGeophysical Research Letters
Volume26
Issue number21
DOIs
StatePublished - Nov 1 1999

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

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