Physics
Scientific paper
Nov 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999georl..26.3281b&link_type=abstract
Geophysical Research Letters, Volume 26, Issue 21, p. 3281-3284
Physics
13
Ionosphere: Ionosphere/Magnetosphere Interactions, Magnetospheric Physics: Current Systems, Magnetospheric Physics: Magnetosphere/Ionosphere Interactions
Scientific paper
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-Alfvén 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.
Bhattacharjee Anirban
Kletzing Craig A.
Ma Zhi-Wei
Ng Chun Sum
Otani Niels F.
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