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Effect of double layers on magnetosphere-ionosphere coupling
| Content Provider | NASA Technical Reports Server (NTRS) |
|---|---|
| Author | Lysak, Robert L. Hudson, Mary K. |
| Copyright Year | 1987 |
| Description | The Earth's auroral zone contains dynamic processes occurring on scales from the length of an auroral zone field line which characterizes Alfven wave propagation to the scale of microscopic processes which occur over a few Debye lengths. These processes interact in a time-dependent fashion since the current carried by the Alfven waves can excite microscopic turbulence which can in turn provide dissipation of the Alfven wave energy. This review will first describe the dynamic aspects of auroral current structures with emphasis on consequences for models of microscopic turbulence. A number of models of microscopic turbulence will be introduced into a large-scale model of Alfven wave propagation to determine the effect of various models on the overall structure of auroral currents. In particular, the effects of a double layer electric field which scales with the plasma temperature and Debye length is compared with the effect of anomalous resistivity due to electrostatic ion cyclotron turbulence in which the electric field scales with the magnetic field strength. It is found that the double layer model is less diffusive than in the resistive model leading to the possibility of narrow, intense current structures. |
| File Size | 848474 |
| Page Count | 20 |
| File Format | |
| Alternate Webpage(s) | http://archive.org/details/NASA_NTRS_Archive_19870013888 |
| Archival Resource Key | ark:/13960/t2p60g10v |
| Language | English |
| Publisher Date | 1987-05-01 |
| Access Restriction | Open |
| Subject Keyword | Geophysics Plasma Layers Boundary Value Problems Plasma Turbulence Cold Plasmas Magnetosphere-ionosphere Coupling Auroral Arcs Earth Magnetosphere Time Dependence Wave Propagation Reaction Kinetics Mathematical Models Earth Ionosphere Current Density Electric Fields Plasma Temperature Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science |
| Content Type | Text |
| Resource Type | Article |
