The Ionospheric Alfven Resonator and ULF wave propagation through the Ionospheric Horizontal Waveguide. Computer numerical simulations. [PhD. thesis]
Supervisor: RNDr.Karel Prikner, CSc.
Geomagnetic pulsations in the frequency range ~ 0.1 – 5 Hz (ULF range) are generated in the inhomogeneous and anisotropic (magneto active) Earth’s ionosphere plasma medium forming the ionospheric Alfven resonator (IAR). The primary resonator action can be studied at the high subauroral latitudes only. There the region is fitting tightly the magnetospheric plasmapause along which waves propagate into the ionosphere. Downwards to mid and lower latitudes the generated resonances have to transform into waveguide modes able to propagate through the ionospheric horizontal waveguide (IHW). There is dominant the ionospheric region with the decreased Alfven velocity and maximum of the electron concentration, the F-layer. At the present times a numerical method of the IAR simulation is developed for the direct wave propagation through the ionosphere to the ground surface across the thin-layered ionosphere medium on the basis of a 4×4 matrix method. As the further step - developing of a new numerical method for simulation of the IHW – is put forward on the basis of computer simulation of wave propagation through the real altitude profiled horizontal waveguide.
References:
Prikner, K., and V. Vagner, The ionosphere as an Alfvén resonator in the Pc1 micropulsation range. Studia geoph. et geod., 34, 342 - 361, 1990.
Prikner, K., and V. Vagner, Numerical solution to the problem of ionospheric filtration of ULF waves in the Pc1 range. The total wave field inside the ionospheric transition layer. Studia geoph. et geod., 35, 90 - 99, 1991.
Mursula, K., K. Prikner, F. Z. Feygin, T. Brä ysy, J. Kangas, R. Kerttula, P. Pollari, T. Pikkarainen, and O.A. Pokhotelov, Non-stationary Alfvén resonator: New results on Pc1 pearls and IPDP events. J. Atmos. Terr. Phys., 66, 299 - 309, 1999. |
