Propagation of lower hybrid resonance waves in depleted-plasma regions in the upper auroral ionosphere |
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Authors: | D L Pasmanik A G Demekhov V Yu Trakhtengerts E E Titova and M J Rycroft |
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Institution: | (1) Institute of Applied Physics of the Russian Academy of Sciences, Nizhny Novgorod, Russia;(2) Polar Geophysical Institute, Apatity, Russia;(3) CAESAR Consultancy, Cambridge, UK |
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Abstract: | We study theoretically the propagation of lower-hybrid resonance (LHR) waves in the auroral ionospheric plasma. The ray-tracing
technique is used to study the properties of LHR wave propagation with account of a large-scale inhomogeneity both along and
across the geomagnetic field. It is shown that wave refraction in such an inhomogeneous medium can result in direct transformation
of LHR waves whose wave normals make large angles with the geomagnetic field into whistler-mode waves, whose wave vectors
are close to the geomagnetic-field direction and which can therefore pass through the ionosphere to the ground. The parameters
of LHR waves which can thus be transformed into whistler-mode waves are found. The transformation process considered can be
important for interpreting ground-based observations of ELF waves.
Deceased.
Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 52, No. 4, pp. 279–289, April 2009. |
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