Physics
Scientific paper
Dec 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsm11a1699d&link_type=abstract
American Geophysical Union, Fall Meeting 2010, abstract #SM11A-1699
Physics
[2706] Magnetospheric Physics / Cusp, [2736] Magnetospheric Physics / Magnetosphere/Ionosphere Interactions, [2753] Magnetospheric Physics / Numerical Modeling, [2788] Magnetospheric Physics / Magnetic Storms And Substorms
Scientific paper
The properties of particle precipitation and plasma waves in the low-altitude cusp are distinct from those in neighboring regions, so prediction of the cusp location and extent under dynamic conditions is important in understanding polar-region variability. The aim of this paper is to examine how the properties of the dayside cusp vary with solar wind conditions in the LFM global simulation. This variation is then compared to similar observations obtained from satellite data. The simulation is run for the August 31, 2005 to September 1, 2005 moderate storm where Bz peaked at -17 nT and Dst at -140 nT. The solar wind data from these two days exhibit a wide range of conditions that enable a statistical representation of the cusp to be obtained. The simulated cusp centre is identified by the position of maximum dayside dipole depression at 6 RE. This location is then mapped along field lines to the ionosphere. The latitude of the cusp is then co-correlated with the Bz component of the IMF to calculate the best time offset between solar wind data and cusp location. The correlation of the cusp latitude and various solar wind IMF coupling functions is explored. The linear correlation of the simulated cusp latitude with the southward component of the IMF is approximately 0.75. In agreement with Newell et al. 2006 a higher correlation is obtained using other solar wind coupling functions such as Kan-Lee electric field (0.89) and half wave rectifier (0.88). The MLT position of the simulated cusp is found to depend upon the strength of By. The linear correlation at 0.54 is not as strong as between Bz and cusp latitude. The width of the simulated cusp in both latitude and MLT is also examined. The area of the cusp is set to be the region at 6 RE where the dipole depression is more than 52 nT. The size of the cusp is found to depend on the solar wind dynamic pressure and electric field. Newell, P. T., T. Sotirelis, K. Liou, C.I. Meng, and F.J. Rich (2006), Cusp latitude and the optimal solar wind coupling function, J. Geophys. Res., 111, A09207, doi:10.1029/2006JA011731.
Brambles O.
Dunlap-Shohl W. A.
Lotko William
Zhang Baigang
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