On the problem of quasi-electrostatic whistler mode waves: A possible interpretation of discrete plasmaspheric emissions |
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Authors: | Jaroslava Bo?ková Franti?ek Ji?í?ek Pavel T?íska B V Lundin D R Shklyar Reviewer M Hvo?dara |
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Institution: | (1) Geophysical Institute, Czechosl. Acad. Sci., Prague;(2) Institute for Terrestrial Magnetism, Ionosphere and Radiowave Propagation, Acad. Sci., USSR |
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Abstract: | Summary In a number of VLF experiments with low-orbiting Intercosmos satellites, high-intensity, discrete VLF emissions at frequencies above the local LHR were observed predominantly between L=2.3 and 4.0. The frequency of their intensity maximum varies continuously with geomagnetic latitude, and approximately parallels the value of a quarter of the equatorial electron gyrofrequency. An attempt is made to interprete these emissions in terms of quasi-electrostatic whistler-mode waves, generated in the near-equatorial region and propagating downward in the quasi-resonance mode. The generating mechanism is supposed to be the kinetic instability connected with the loss-cone and temperature anisotropy of the distribution function of energetic electrons. Some features of the discrete plasmaspheric emissions are discussed on the basis of theoretical considerations.
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