Statistical Study of the Magnetospheric Open-Closed Boundary (OCB) using ULF Wave Observations from Antarctic Ground Magnetometers As Compared to the Tsyganenko Model

We present a statistical study using ground magnetometer data which are located over extensive latitudes from subauroral to the deep polar cap region. These include the Antarctic Automated Geophysical Observatories (AGOs), McMurdo Station (MCM), and South Pole Station (SPA), to characterize open-closed boundary (OCB) behavior during geomagnetically quiet times. Knowledge of the location and dynamics of the magnetic field line OCB provides insight to space physics processes such as substorms, particle precipitation events, and magnetospheric configuration. Prior studies have shown that determination of the OCB location can be made by examining the ULF wave power in data from a latitudinal chain of ground-based magnetometers extending from the auroral zone into the deep polar cap.