Solar wind influence on Pc4 and Pc5 ULF wave activity in the inner magnetosphere

Details Solar wind influence on Pc4 and Pc5 ULF wave activity in the inner magnetosphere Solar wind influence on Pc4 and Pc5 ULF wave activity in the inner magnetosphere

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009agufmsm11a1569l&link_type=abstract

American Geophysical Union, Fall Meeting 2009, abstract #SM11A-1569

Physics

[2712] Magnetospheric Physics / Electric Fields, [2730] Magnetospheric Physics / Magnetosphere: Inner

Scientific paper

Abundant evidences have previously been shown that the ULF wave activities measured at geosynchronous orbit are well correlated with solar wind parameters, such as solar wind dynamic pressure. However, these studies, based only magnetic field measurements near the equatorial plane, cannot determine the actual ULF wave power because magnetic field oscillation in torodial mode has a node at the equator. In this study, we use both electric and magnetic field measurements by THEMIS satellites in the inner magnetosphere to statistically examine the correlation between the overall ULF wave activities in the inner magnetosphere and the solar wind parameters. Based on the electric field observations from July 2007 to May 2009, a strong correlation has been found between the daily averaged integral Pc4&5 wave power in 4~9 Re and the solar wind velocity; the correlation with solar wind dynamic pressure is not as obvious. The THEMIS magnetic field measurements show that the correlation coefficient decreases with solar velocity but increases with dynamic pressure, in contrast to the results based on the electric field measurements. We suggest that the difference is due to the detection of different ULF mode pulsations (toridal and poloidal) and that electric field measurements near the equator are critical to investigate Pc4 and Pc5 ULF wave activities.

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