Topic/Type: 3. Other, Poster

Modeling of Plasma-Field Dynamical Effects in Radio-wave Modified Ionosphere

A. V. Kochetov

Institute of Applied Physics RAS, Nizhny Novgorod, Russia

The theoretical results of the model study of ?aftereffect? phenomena arising in the modified ionosphere at relaxation stage after the action of powerful radio emission are presented. The simulations are based on the numerical solution of modified nonlinear Schr?dinger equation with a self-consistent driven extension. The qualitative agreement of theoretical and experimental is demonstrated ( G.I. Terina, An after-effect in artificially disturbed ionospheric plasma, Izv .VUZov, Radiofizika, 2000, Vol. 43, p.958).
The numerical simulations of the action of self-consistent incident powerful electromagnetic wave absorption arising in the regions of plasma turbulence excitation at formation stage to reflection index dynamics are carried out. The non-linear Schr?dinger equation in inhomogeneous plasma layer with incident wave pumping and radiation damping is extended with the imaginary part of plasma dielectric constant (volume damping) in the regions with strong electromagnetic field. The large range of volume damping parameters: absolute value, threshold, amplitude function, including hysteretic dependence, is studied. For some regimes it is obtained that the calculated reflection index dynamics agrees qualitatively to the experimental results (B. Thide, E. N. Sergeev, S. M. Grach,T. B. Leyser, T. D. Carrozi, Competition between Langmuir and upper hybrid turbulence in an HF pumped ionosphere, Phys. Rev. Lett., 2005, vol. 95, no. 25, p. 255002).
The work is supported in part by Russian Foundation for Basic Research by the grant No. 09-02-01150-a.