Double Layers, Ion Holes, and Ion-Acoustic Solitons in the Auroral Upward Current Region: Simulations and Observations

Details Double Layers, Ion Holes, and Ion-Acoustic Solitons in the Auroral Upward Current Region: Simulations and Observations Double Layers, Ion Holes, and Ion-Acoustic Solitons in the Auroral Upward Current Region: Simulations and Observations

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufmsm31b0327m&link_type=abstract

American Geophysical Union, Fall Meeting 2006, abstract #SM31B-0327

Other

2704 Auroral Phenomena (2407), 2712 Electric Fields (2411), 4455 Nonlinear Waves, Shock Waves, Solitons (0689, 2487, 3280, 3285, 4275, 6934, 7851, 7829 Kinetic Waves And Instabilities, 7839 Nonlinear Phenomena (4400, 6944)

Scientific paper

The dynamic evolution of the ionosphere auroral cavity boundary has been studied using 1-D and 2-D kinetic Vlasov simulations. The simulations are initialized with a strong observation-based double layer (DL) and include two ion species (H+,O+) and electrons. The initial 1-D DL models are stationary solutions of the Vlasov-Poisson system, though they are not necessarily stable. Because FAST observations suggest that most DLs are oblique to the magnetic field, we have studied the 2-D evolution of a related DL in an oblique geometry (i.e., the initial DL normal and geomagnetic field are not parallel to each other). Results from the 1-D and oblique 2-D simulations will be presented. We show that the DL is quasi-stable in both 1-D and 2-D. In addition, the simulations verify that the streaming interaction between accelerated H+ and O+ populations, continuously replenished by the DL, provides the free energy for the persistent formation of ion phase-space holes. A comparison between FAST observations of ion holes and the ion holes seen in the simulation will be made. A surpising result from both the 1-D and 2-D simulations is that under certain conditions an ion-acoustic soliton (IAS) forms in the auroral upward current region that is associated with a population of earthward-traveling ions. FAST observations of an IAS and earthward traveling ions will be shown which compares favorably with the simulations.

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