Development of a Flow Velocity Shear Instability in the Presence of Finite Larmor Radius Effects

Monday, 15 December 2014
Vladimir I Sotnikov1, Tony C Kim1, Evgeny V Mishin2, Thomas C Genoni3, David V Rose3 and Ioana Paraschiv4, (1)Air Force Research Laboratory, Wright-Patterson AFB, OH, United States, (2)Air Force Research Laboratory Kirtland AFB, Kirtland AFB, NM, United States, (3)Voss Scientific Inc, Albuquerque, NM, United States, (4)University of Nevada Reno, Reno, NV, United States
Ionospheric irregularities cause scintillations of electromagnetic signals that can severely affect navigation and transionospheric communication, in particular during Equatorial Plasma Bubbles (EPBs) events. However, the existing ionospheric models do not describe density irregularities with typical scales of several ion Larmor radii that affect UHF and L bands. These irregularities can be produced in the process of nonlinear evolution of interchange or flow velocity shear instabilities. We present the results of numerical simulations of excitation and nonlinear saturation of Kelvin-Helmholtz instability by means of two-fluid hydrodynamic model which includes finite Larmor radius effects. The high-resolution simulations are driven by the ambient conditions corresponding to the AFRL C/NOFS satellite low-resolution data during EPBs.