Experimental evidence of resonant cavities in the high--latitude ionosphere above Svalbard

Details Experimental evidence of resonant cavities in the high--latitude ionosphere above Svalbard Experimental evidence of resonant cavities in the high--latitude ionosphere above Svalbard

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufmsm13d2119y&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #SM13D-2119

Physics

[2407] Ionosphere / Auroral Ionosphere, [2431] Ionosphere / Ionosphere/Magnetosphere Interactions, [2752] Magnetospheric Physics / Mhd Waves And Instabilities, [2790] Magnetospheric Physics / Substorms

Scientific paper

Many studies of ultra low frequency waves in the 0.1-5 Hz range, both observational and theoretical, make reference to the role of three specific resonant cavities in supporting wave growth or propagation in the ionosphere. These three cavities are the ionospheric waveguide, the ionospheric Alfvén resonator (IAR) and the auroral Alfvén resonator (AAR). The first is centered on the F2 region density peak, the second is bounded below by the conducting E region and above by sharp gradients in the Alfvén speed at a few thousand kilometers and the third, which shares a lower boundary with the IAR, is bounded above by a potential drop due to auroral precipitation. This study presents observations of resonance structures appearing in induction coil magnetometer data from three stations in Svalbard, Norway: Hornsund (CGM Lat. = {74.23}o, MLT Midnight = 21:01), Longyearbyen (CGM Lat. = 75.29o, MLT Midnight = 20:50) and Ny {Å}lesund (CGM Lat. = {76.30}o MLAT, MLT Midnight = 20:56). We visually inspect Fourier spectra to determine locations of spectral enhancements between 0.1-5 Hz and use a characteristic spectrum to determine the resonator quality factor, Q, which is a measure of the wave power amplification within the resonator. Equivalently, this is a measure of the coupling efficiency of the resonator to some input perturbation. This study will provide support for the upcoming Magnetosphere-Ionosphere Coupling in the Alfvén Resonator (MICA) sounding rocket mission.

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