Electromagnetic coupling of localized upper hybrid oscillations in a system of density depletions

Hall, J. O.; Istomin, Ya. N.; Leyser, T. B.
January 2009
Physics of Plasmas;Jan2009, Vol. 16 Issue 1, pN.PAG
Academic Journal
One of the most important effects of pumping the ionospheric plasma by a powerful high frequency electromagnetic wave from the ground is the excitation of filamentary density irregularities. These striations are density depletions which contain localized upper hybrid oscillations. The upper hybrid oscillations radiate Z mode waves that escape from the depletions and can therefore scatter on neighboring depletions, which provides a means for electromagnetic interaction between different striations. The physics of a Z mode wave scattering on a single density depletion is studied analytically in one dimension. At resonance the incident Z mode wave is totally reflected from the irregularity. The treatment of many parallel striations interacting through the Z mode radiation shows that different scattering processes are involved to excite the even and odd modes of the localized upper hybrid oscillations.


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