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 language | English (US) |
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Pages (from-to) | 3281-3284 |
Number of pages | 4 |
Journal | Geophysical Research Letters |
Volume | 26 |
Issue number | 21 |
DOIs | |
State | Published - Nov 1 1999 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Geophysics
- General Earth and Planetary Sciences