Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm41b1717y&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM41B-1717
Physics
[2487] Ionosphere / Wave Propagation, [2704] Magnetospheric Physics / Auroral Phenomena, [2788] Magnetospheric Physics / Magnetic Storms And Substorms
Scientific paper
Previous studies of ducting in the ionospheric waveguide, both theoretical and experimental, have focused on propagation characteristics of LH polarized electromagnetic ion cyclotron waves and have attempted to quantify various characteristics such as attenuation and propagation speed. However, no such study has been carried out with regard to irregular ULF disturbances (e.g., Pi1B pulsations), despite the fact that these waves, too, appear to be ducted. We present a statistical study of approximately 90 Pi1B events,using data gathered from an induction coil magnetometer array located in Svalbard Norway, with good alignment along the magnetic meridian: Hornsund (CGM Lat. = 76.97, MLT Midnight = 21:01), Longyearbyen (CGM Lat. = 78.20, MLT Midnight = 20:50), Ny Alesund (CGM Lat. = 78.93, MLT Midnight = 20:56). We find that Pi1B waves are ducted in a manner similar to EMIC waves and we discuss effects amounting to a highpass filter effect, where waves with long wavelengths (low frequencies) are not ducted.
Engebretson Mark J.
Lessard Marc
Young M. A.
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