Physics – Plasma Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm43c..04k&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM43C-04
Physics
Plasma Physics
[2487] Ionosphere / Wave Propagation, [2736] Magnetospheric Physics / Magnetosphere/Ionosphere Interactions, [7867] Space Plasma Physics / Wave/Particle Interactions
Scientific paper
ULF Pc1 geomagnetic pulsations have been observed from a ground array of search-coil magnetometers predominantly in the pre-noon to post-noon sector of Antarctica. With extensive coverage from geomagnetic latitudes of 62° to 87° and good alignment along the magnetic meridian, the five search-coil magnetometers operating aboard American Automated Geophysical Observatories (AGOs) and British Antarctic Survey (BAS) showed very clear ducting with spectral power attenuation of the waves in the waveguide. Halley Station, located at the lowest latitude, typically observed the highest spectral wave power and well-defined band-limited signatures with the same wave event, showing less wave power, found at the other four remote stations at higher latitudes. This is a clear implication of the ducting of the electromagnetic ion cyclotron (EMIC) waves in the ionospheric waveguide, which are generated from the equatorial magnetosphere along the geomagnetic field lines and transmitted to the ionosphere. Since the wave event was observed over a very wide range in latitude, the observation of the wave propagation will provide significant information on the ULF wave ducting in the waveguide and the source region. This study presents the observations of over 100 Pc1 events showing spectral power attenuation in the waveguide. The changes of the polarization properties such as ellipticity and polarization ellipse major axis direction during the propagation are also shown. It is shown both qualitatively and quantitatively how these behaviors are affected by specific ionospheric conditions (i.e. conductivity) and geomagnetic activity. In addition, CHAMP satellite data obtained in the ionosphere is also presented to validate the wave ducting.
Engebretson Mark J.
Kim Hungsoo
Lessard Marc
Young M. A.
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