The Electrostatic Drift Wave in the Inner Magnetosphere
- Gordon R. Wilson
Published Online: 18 MAR 2013
Copyright 1991 by the American Geophysical Union.
Modeling Magnetospheric Plasma Processes
How to Cite
Huang, T. S. (1991) The Electrostatic Drift Wave in the Inner Magnetosphere, in Modeling Magnetospheric Plasma Processes (ed G. R. Wilson), American Geophysical Union, Washington, D. C.. doi: 10.1029/GM062p0135
- Published Online: 18 MAR 2013
- Published Print: 1 JAN 1991
Print ISBN: 9780875900285
Online ISBN: 9781118663905
- Space plasmas—Mathematical models—Congresses;
- Magnetosphere—Mathematical models—Congresses
We investigate electrostatic drift waves with k·B = 0 in the Birkeland current flow region of the inner magnetosphere. In the evening sector of Region I (and perhaps the morning sector of Region II) associating with parallel currents away from the ionosphere there exists a field-aligned potential drop. It modifies the magnetosphere-ionosphere coupling relation in those regions, and effectively reduce the field line-tying effect of the ionosphere. Using the theory of individual particle motion and the magnetosphere-ionosphere coupling relation, we formulate the linear theory for an azimuthally propagating electrostatic drift wave in the above regions. The results show that an instability may arise from resonance of the wave with the drift of hot plasma particles (ring current plasma and sheet plasma). This instability is related to the difference between the distributions of hot electrons and ions in the plasma. The growth rate of the wave is linear in the azimuthal wave number.