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GEOPHYSICAL RESEARCH LETTERS, VOL. 32, L23103, doi:10.1029/2005GL023795, 2005

On fine structure emission associated with plasmaspheric density irregularities

P. H. Yoon

Institute for Physical Science and Technology, University of Maryland, College Park, Maryland, USA


J. D. Menietti

Department of Physics and Astronomy, University of Iowa, Iowa City, Iowa, USA


Abstract

The eigenvalue analysis for the upper-hybrid/Langmuir waves trapped in cylindrical density structures is carried out. Under physical parameters typical for kilometric continuum (KC) source region, it is found that the frequency spacing between individual fine structure spectrum is within a reasonable observed range of 0.1∼1 kHz. It is also found that the quasi field-aligned modes are associated with density cavities, while the radial modes are excited within enhanced density column, thus showing that density irregularities of various types can support discrete wave spectrum featuring wide-ranging frequency gaps.

Received 13 June 2005; accepted 11 October 2005; published 6 December 2005.

Index Terms: 2439 Ionosphere: Ionospheric irregularities; 2772 Magnetospheric Physics: Plasma waves and instabilities (2471); 6984 Radio Science: Waves in plasma (7867); 7829 Space Plasma Physics: Kinetic waves and instabilities.

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Citation: Yoon, P. H., and J. D. Menietti (2005), On fine structure emission associated with plasmaspheric density irregularities, Geophys. Res. Lett., 32, L23103, doi:10.1029/2005GL023795.