Role of Density Depletion Ducts on the Generation of Continuum Radiation

Details Role of Density Depletion Ducts on the Generation of Continuum Radiation Role of Density Depletion Ducts on the Generation of Continuum Radiation

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm41b1178g&link_type=abstract

American Geophysical Union, Fall Meeting 2005, abstract #SM41B-1178

Physics

2730 Magnetosphere: Inner, 2768 Plasmasphere, 2772 Plasma Waves And Instabilities (2471), 2778 Ring Current

Scientific paper

There are three main types of non-thermal continuum (NTC) radiation that are distinguished by their frequency range and source location. The normal continuum radiation (also referred to as the trapped and escaping continuum) is typically in the 5 to 100 kHz frequency range generated at the plasmapause in the morning sector. The continuum enhancement is observed from 10-100 kHz frequency range coming from night-side plasmapause source regions. Kilometric continuum is generated at the plasmapause, near the magnetic equator, deep in notch structures of the plasmasphere over a frequency range from 100 to 800 kHz. On a number of occasions it has been found that IMAGE/Radio Plasma Imager (RPI) observes density depletion ducts near the plasmapause associated with NTC. In addition, IMAGE/RPI observes density depletion ducts preferentially on the late morning side consistent with the location of the normal non-thermal continuum source region. NTC is believed to be generated by the linear or non-linear Z-to-O mode conversion process at the "radio window". Ray tracing calculations are used to investigate Z-mode propagation characteristics to the point of conversion to the escaping O mode within a density depletion duct. Preliminary results show that the density duct concentrates the Z-mode waves thereby enhancing the Z-to-O mode conversion for the generation of NTC.

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