The Role of the DNT Resonance in the Classification of Magnetospheric and Ionospheric Resonances

Details The Role of the DNT Resonance in the Classification of Magnetospheric and Ionospheric Resonances The Role of the DNT Resonance in the Classification of Magnetospheric and Ionospheric Resonances

Dec 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003agufmsm42c0627o&link_type=abstract

American Geophysical Union, Fall Meeting 2003, abstract #SM42C-0627

Physics

2471 Plasma Waves And Instabilities, 2481 Topside Ionosphere, 2700 Magnetospheric Physics

Scientific paper

A prominent sounder-stimulated plasma resonance with a frequency between the upper-hybrid frequency fuh (fT in ionospheric notation) and the electron plasma frequency fpe ( fN in ionospheric notation) was first identified and designated as the DNT resonance in ionospheric topside sounder ionograms [Benson, Radio Sci., 17, 167, 1982]. The letter D indicates that it has a diffuse appearance on the topside ionograms. Recently this resonance has also been observed to be stimulated in the magnetosphere by the Radio Plasma Imager (RPI) on the IMAGE satellite [Benson et al., JGR, 108(A5),1207, doi:10.1029/2002JA009589, 2003]. No theory has been offered to explain the formation of the DNT resonance. We will present the theoretical foundation for the following formula for the frequency of DNT which is a function of only fpe and the electron gyrofrequency fce: FDNT=√ {(Fp2+1+√ {F_p^4+1})/2} where FDNT}=f{DNT}/f_{ce and Fp=fpe}/f_{ce. We will show that this formula reproduces the Alouette 2, ISIS-1 and IMAGE/RPI observations. The results indicate that the use of this formula will provide a valuable additional independent confirming element to the spectral identification of sounder-stimulated plasma resonances in certain Fp ranges. This confidence in spectral classification, in turn, leads to confidence in determining the electron density Ne to within a few per cent even in space plasmas with Ne < 10 cm-3 where determinations to this accuracy are difficult to achieve.

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