Parametric excitation of upper hybrid and kinetic alfven waves in a magnetized plasma

1Yukhimuk, AK, 2Fedun, VN, 3Yukhimuk, VA, 2Ivchenko, VN
1Main Astronomical Observatory of the National Academy of Sciences of Ukraine, Kyiv, Ukraine
2Taras Shevchenko National University of Kyiv, Kyiv, Ukraine
3Taras Shevchenko National University of Kyiv, Kyiv, Ukraine; Newcastle University , Newcastle, Australia
Kosm. nauka tehnol. 1998, 4 ;(1):108–112
Section: Space and Atmospheric Physics
Publication Language: Russian
Nonlinear parametric excitation of kinetic alfven waves and upper-hybrid waves in a magnetized plasma is studied. The pumping wave is an ordinary electromagnetic wave which decays into a kinetic Alfven wave and an upper-hybrid wave. Two-fluid magnetohydro-dynamics is used to describe the nonlinear parametric interaction of the waves. A nonlinear dispersion equation is found for the coupling of the upper-hybrid and kinetic Alfven waves. We found also the instability growth rate у which is proportional to the electron inertial length (ае = с/ωре). Therefore, this process is possible only if one takes the electron inertia for Alfven waves into account. We use our theoretical results to explain some physical processes in the ionospheric plasma during active experiments
Keywords: electromagnetic wave, nonlinear parametric excitation, plazma
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