Parametric Study of Magnetospheric Ion Temperatures Using TWINS ENA Data and BATS-R-US Simulations

We present results from our continued parametric study into how the spatial distribution of inner magnetospheric ion temperatures varies as a function of solar wind parameters. We have taken 2+ years of ACE solar wind data and binned by (1) Bz polarity, (2) dynamic pressure: low and high, (3) IMF clock angle polarity, and (4) solar wind flow angle polarity. Average magnetospheric ion temperatures over the given time interval are determined for each parametric bin by applying the methods described in Scime, et al. [2002; 2005] and Keesee, et al. [2008; 2011] to energetic neutral atom (ENA) data collected by the TWINS I and II spacecraft. Here we present results showing global and local features in ion temperature maps in an Earth-centered 40 RE x 40 RE region, and we compare these results with magnetospheric ion temperatures simulated using the BATS-R-US global MHD code. The BATS-R-US simulations are driven by solar wind conditions averaged over the times associated with each parametric bin.