Physics – Plasma Physics
Scientific paper
Jul 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996jgr...10115441v&link_type=abstract
Journal of Geophysical Research, Volume 101, Issue A7, p. 15441-15456
Physics
Plasma Physics
17
Magnetospheric Physics: Energetic Particles, Trapped, Magnetospheric Physics: Plasma Waves And Instabilities, Space Plasma Physics: Charged Particle Motion And Acceleration, Space Plasma Physics: Kinetic And Mhd Theory
Scientific paper
The radial localization of the drift Alfvén ballooning modes (DABM), proposed by Chen and Hasegawa [1991] to explain Pc 4-5 pulsations excited by highly energetic ring current protons, is examined by using WKB approximations in the radial direction. The problem is reduced to two nested one-dimensional ones, one along the equilibrium magnetic field lines and the other in the radial direction. By ignoring kinetic effects to lowest order it is found that a localization potential well can exist for sufficiently strong earthward pressure gradient (the outer edge of the ring current). However, mode energy tunnels through a finite barrier and gets absorbed at the field line resonance layer, thereby causing damping of the global mode. This damping process imposes a minimum azimuthal mode number for the mode to be localized. The bounce-drift resonance of highly energetic protons is treated perturbatively. The results further support the theoretical picture that antisymmetric high-azimuthal mode-number drift Alfvén-ballooning modes are a good candidate instability mechanism for internally excited geomagnetic pulsations.
Chen Liu
Vetoulis Georgios
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