Generation of electromagnetic radiation by an upper hybrid pumping wave in a magnetized plasma

1Yukhimuk, AK, 2Fedun, VN, 3Yukhimuk, VA, 2Fal'ko, OG
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):102–107
Publication Language: Russian
We discuss a nonlinear mechanism for the generation of electromagnetic radiation in a magnetized plasma with a low plasma parameter β . Two-fluid magnetohydrodynamics is used to describe the decay of an upper hybrid pumping wave into a left polarized (ordinary) electromagnetic wave and a kinetic Alfven wave. We found the instability growth rates у which are proportional to electron inertial length (ae = c/ωpe). Therefore, this process is possible only if one takes the electron inertia for Alfven waves into account. The left polarased wave generation occur much faster than the generation of the ordinary wave. The nonlinear processes discussed in this study can occur in the upper ionosphere and the magnetosphere where the plasma parameter β is low.
Keywords: electromagnetic radiation, nonlinear processes, plasma
1. Yukhimuk A. K., Yukhimuk V. A., Kucherenko V. P. Nonlinear mechanism of Alfven waves generation in magnetized plasma. Kinematika Fiz. Nebesn. Tel, 11 (5) 71—77 (1995) [in Russian].
2. Yukhimuk, A.K., Yukhimuk, V.A., Fal'ko, O.G. Nonlinear mechanism of electromagnetic radiation generation in cosmic plasma. Kosm. nauka tehnol., 1 (2-6) 65—71 (1995) [in Russian].
3. Yukhimuk V. A., Yukhimuk A. K. Parametric excitation of upper-hybrid and ionic acoustic waves in the space plasma. Kinematika Fiz. Nebesn. Tel, 10 (6), 67—73 (1994) [in Russian].
4.  Chian A., Lopes S. R., Aeves M. V. Nonlinear exitation of Longmuir and Alfven waves by auroral whistler waves in the planetary magnetosphere. Astron. and Astrophys., 288 (3), 981—984 (1994).
5.  Leyser T. B. Parametric interaction between upper hybrid and low hybrid waves in heating experiments. Geophys. Res. Lett., 18 (3), 408—411 (1991).
6.  Murtaza G., Shukla P. K. Nonlinear generation of electromagnetic waves. J. Plasma Phys., 31, 432—436 (1984).
7.  Oya H., Marioka A., Kobayashi K., et al. Plasma  wave observation and sounder experiments (PWS) using the Akebano (E XOS-D) satellite-instrumentation and initial result including discovery of the high altitude equatorial plasma turbulence. J. Geomag. Geoelectr., 42, 441—444 (1990).
8.  Shukla P. K., Stenflo L. Nonlinear Alfven waves. Phys. scr., 60, 32—35 (1995).
9. Stenflo L. Stimulated scattering of large amplitude waves in the ionosphere. Phys. scr., 30, 166—169 (1990).
10. Stenflo L. Resonant three-wave interaction in plasmas. Phys. scr., 50, 15—19 (1994).
11. Stenflo L., Shukla P. K. Generation of radiation by upper hybrid pump waves. J. Geophys. Res., 100A (9), 17261 — 17263 (1995).
12. Stubbe P., Kopka H., Thide B., Derblom H. Stimulated electromagnetic emissions: a new technique to study the parametric decay instability in the ionosphere. J. Geophys. Res., 89A (3), 7523—7536 (1984).
13. Wahlund J. E., Louarn P., Chust T. et al. Observations of ion acoustic fluctuations in the auroral topside ionosphere by the FREJA s/c. Geophys. Res. Lett., 21 (17), 1835—1838 (1994).

14. Yukhimuk A. K., Yukhimuk V. A., Falko O. G. Nonlinear mechanism electromagnetic radiation generation in spase plasma. Proc. 23rd Europian Phys. Soc. Conf. on Controlled Fusion and Plasma Physics, Eds D. Gresillon, A. Sitenko, A. Zagorodny, Vol. 20c. Part III, 1325—1328 (Bogolyubov Inst. for Theoret. Phys., Kiev, 1996).