Statistical Study of ULF Pc 1-2 Wave Propagation Characteristics in the High Latitude Ionospheric Waveguide

Details Statistical Study of ULF Pc 1-2 Wave Propagation Characteristics in the High Latitude Ionospheric Waveguide Statistical Study of ULF Pc 1-2 Wave Propagation Characteristics in the High Latitude Ionospheric Waveguide

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agusmsm23a..04y&link_type=abstract

American Geophysical Union, Spring Meeting 2009, abstract #SM23A-04

Physics

2487 Wave Propagation (0689, 3285, 4275, 4455, 6934), 2772 Plasma Waves And Instabilities (2471), 6934 Ionospheric Propagation (0689, 2487, 3285, 4275, 4455)

Scientific paper

It is well-documented that the ionospheric cavity bounded by the E and F2 layers acts as a waveguide for geomagnetic pulsations. Using data from a five-station search-coil magnetometer array in the Antarctic (ordered poleward: Halley Bay, AGO P2, South Pole, AGO P1, AGO P5), a study is made of ULF Pc 1-2 geomagnetic pulsations in the 0.1-1.0 Hz range to examine their spectral wave power attenuation during propagation through the ionospheric waveguide. Here we present results from a statistical study of over 100 events showing that Pc 1-2 geomagnetic pulsations exhibit well-defined poleward ducting behavior in the ionospheric waveguide as well as significant spectral power loss during poleward propagation, which suggests that Pc 1-2 waves are injected into the lower latitude ionosphere and guided through the ducting layer. Through the use of spectrograms and wave power attenuation plots, we show both qualitatively and quantitatively how these behaviors are affected by specific ionospheric conditions connected to the timing of the event with regard to magnetic local time. It is also examined in a statistical way how wave spectral power attenuation is related to sunlit conditions, which are thought to contribute to the ionospheric conductivity.

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