Investigation of Magnetospheric Conditions During Periodic Substorm Events with a Nonlinear Dynamical Model

Sawtooth events in the period between 1998-2006 are input into the low dimensional WINDMI physics model to obtain the statistical average of the energy content in the earth's ring current, central plasma sheet and geotail lobes. The input to the model are solar wind parameters obtained from the ACE spacecraft, while the output are the AL index and Dst index, obtained whenever possible. We use the database of events to constrain the WINDMI model parameters in order to identify the geotail lobe energy content and plasma sheet pressure that results in the triggering of periodic substorms. We also present the differences in these parameter values and the associated energies between periodic substorms and isolated substorm events, all under southward IMF conditions.