Physics
Scientific paper
Dec 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm31a1512s&link_type=abstract
American Geophysical Union, Fall Meeting 2009, abstract #SM31A-1512
Physics
[2437] Ionosphere / Ionospheric Dynamics, [2730] Magnetospheric Physics / Magnetosphere: Inner, [2736] Magnetospheric Physics / Magnetosphere/Ionosphere Interactions, [2768] Magnetospheric Physics / Plasmasphere
Scientific paper
The Antarctic continent, the only landmass in the southern polar region, offers the unique opportunity for observations that geomagnetically range from polar latitudes to well into the inner magnetosphere, thus enabling conjugate observations in a wide range of geomagnetic latitudes. The SAMBA (South American Meridional B-field Array) chain is a meridional chain of 12 magnetometers, 11 of them at L=1.1 to L=2.5 along the coast of Chile and in the Antarctica peninsula, and one auroral station along the same meridian. SAMBA is ideal for low and mid-latitude studies of geophysical events and ULF waves. It is conjugate to the northern hemisphere MEASURE and McMAC chains, offering unique opportunities for inter-hemispheric studies. In particular, we study asymmetries in the power of ULF waves. Initial studies with a single pair of conjugate stations at L=1.7 and only for Pc3 waves have found that there is a clear seasonal dependence in the Pc3 power at the conjugate stations. The station at summer solstice always experiences higher Pc3 power. However, a permanent asymmetry between the two hemispheres is also seen with the northern station having predominately higher power throughout the year than the southern station. This pattern was also observed in the conjugate TEC measurements indicating that the two ionospheres are clearly different in the same fashion as the wave power. While the initial study was done for 2 full years, we now extend to cover a longer time period. We are also studying the Pc3 power between other pairs of conjugate stations to determine the latitudinal distribution of the asymmetries. Finally, we extend our inter-hemispheric study to Pc 4-5 ULF waves.
Boudouridis Athanasios
Chi Peter J.
Moldwin Mark
Sterner N. L.
Zesta Eftyhia
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