Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm21a1671a&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM21A-1671
Physics
2435 Ionospheric Disturbances, 2437 Ionospheric Dynamics, 2716 Energetic Particles: Precipitating, 2721 Field-Aligned Currents And Current Systems (2409), 7949 Ionospheric Storms (2441)
Scientific paper
Pc 1-2 waves are commonly observed on the ground at high latitudes. An important subset of these waves are electromagnetic ion cyclotron (EMIC) waves, which are believed to play an important role in radiation belt dynamics. Theories of wave propagation in the ionosphere predict that waves at these frequencies will be ducted within the ionospheric wave guide and experimental data exists that are approximately consistent with these theories. In this study, we present results from a statistical study on ducting as observed in the Antarctic, using an extended array of observatories. With coverage of geomagnetic latitudes from 62 to 87 degrees and good alignment along the magnetic meridian, search-coil magnetometers operating at manned stations and on the Automated Geophysical Observatories (AGOs) show clear ducting of these waves. Data from 2007 reveal more than 150 events from Halley Bay, P1, P2, P3, P5, and South Pole stations that provide an excellent opportunity for quantifying ducting phenomena under various conditions, such as daylit versus dark ionospheres, storm times, etc. Results from the study show wave power attenuation, propagation speeds, and polarization for each event.
Argall M. R.
Engebretson Mark
Kim Hungsoo
Lessard Marc R.
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