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Is the Linear Mode Conversion Theory Viable for Generating Kilometric Continuum?Kilometric Continuum (KC) usually exhibits a complicated banded radiation pattern observed in frequency time spectrograms. Can the number of bands, the frequency range over which the bands are observed, and their time variation be explained with Linear Mode Conversion Theory (LMCT) using realistic plasmapause models and Extreme Ultraviolet (EUV) plasmaspheric observations? In this paper we compare KC observations with simulated frequency emission bands based on LMCT for a number of cases. In LMCT the allowed frequency range across the equatorial plasmapause is restricted to frequencies much greater than the electron cyclotron frequency (fce) and less than the maximum plasma frequency in this region. Fce also determines the number of allowed bands in this range. Is the observed frequency range and number of bands consistent with the predications of LMCT? Can irregularities in the shape of plasmaspheric structures like notches be observed in the time variations of KC emissions? We will investigate these and other questions. Simulated radiation patterns will be generated by ray tracing calculations in the L-O mode from the radio window at the near equatorial plasmapause. The KC observations used in this study are from the Plasma Wave Instrument on the Geotail spacecraft and from the Radio Plasma Imager on the IMAGE spacecraft. The plasmasphere and plasmapause will be derived either from plasmasphere simulations, from images by the EUV imager on the IMAGE spacecraft, and by using empirical models. In situ plasma density measurements from a number of spacecraft will also be used in order to reconstruct the plasmasphere for these case studies.
Document ID
20060024879
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Authors
Boardsen, Scott A.
(Maryland Univ. Baltimore County Baltimore, MD, United States)
Green, James L.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Hashimoto, K.
(Kyoto Univ. Uji, Japan)
Gallagher, Dennis L.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Webb, P. A.
(Maryland Univ. Baltimore County Baltimore, MD, United States)
Date Acquired
August 23, 2013
Publication Date
January 1, 2006
Subject Category
Plasma Physics
Meeting Information
Meeting: American Geophysical Union Joint Assembly Spring Meeting
Location: Baltimore, MD
Country: United States
Start Date: May 23, 2006
End Date: May 26, 2006
Distribution Limits
Public
Copyright
Other

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