Electrostatic Ion-Cyclotron Waves in Magnetospheric Plasmas: Non-Local Aspects.
NAVAL RESEARCH LAB WASHINGTON DC
Pagination or Media Count:
The importance of the effect of the magnetic shear and the finite size of current channel on the electrostatic ion-cyclotron instability for the space plasmas is illustrated. A non-local treatment is used. When the channel width Lc, is larger than the shear length Ls, there is a large reduction in the growth rate along with a noteworthy reduction of the band of the unstable perpendicular wavelengths. For Lc or Ls10 the growth rate is not much altered from its local value, however for Lcpi i or 10 to the second power the growth rate starts falling below the local value and vanishes for Lc pi i. The non-local effects lead to enhanced coherence in the ion cyclotron waves.
- Plasma Physics and Magnetohydrodynamics