Electrostatic radiation of plasma in the upper ionosphere in the inhomogeneous geomagnetic field |
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Authors: | N I Izhovkina A T Karpachev I S Prutensky S A Pulinets Z Klos H Rotkel |
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Institution: | (1) Pushkov Institute of Terrestrial Magnetism, Ionosphere and Radio Wave Propagation, Russian Academy of Science, IZMIRAN, Troitsk, Moscow region, 142190, Russia |
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Abstract: | It has been indicated that the spectrum of electrostatic waves in the ionospheric plasma depends on the geophysical conditions
and solar wind parameters. The wave field measurements in the frequency band 0.1–10 MHz in the topside ionosphere were used
to analyze the electrostatic instabilities of the plasma electron content (the APEX satellite experiment). A change of the
sign of one magnetic field component at the geomagnetic equator can result in the formation of the large-scale irregular plasma
structure with a decay of the natural electrostatic oscillations and vortices in unstable plasma. The plasma particle polarization
drift from the region of decay of electrostatic oscillations and vortices can cause large plasma density and temperature gradients
across the geomagnetic field. New vortices can originate at these gradients. This mechanism of plasma vortex formation and
decay can be important for mass and energy convection in the topside ionosphere. |
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