Latitudinal variation of heliospheric ENAs and their correlation with solar wind observations

The interstellar boundary explorer (IBEX) mission measures energetic neutral atoms (ENAs) produced by charge exchange interactions between solar wind protons and interstellar neutrals at the boundary of the heliosphere. Results from IBEX's first two all-sky maps showed that spectral variations of these ENA emissions correlated well with the latitudinal variation of solar wind speeds measured by Ulysses/SWOOPS during the spacecraft's fast latitude scan in 2007 (Dayeh et al., ApJ, 2011). In this study, we examine the first three years of IBEX-Hi ENA measurements (2009-2011) along with solar wind measurements from Ulysses (ending in 06/2009) to further investigate the correlation between ENAs measured by IBEX at 1 AU at different energies and the solar wind structures measured by Ulysses as a function of heliographic latitude and longitude. We also report on the temporal and spectral variations of ENA fluxes at different latitudes during these times. These results will help constrain how ENA production at the heliospheric boundary responds to solar wind variations, and provide added insight into the source region of ENAs, and the shape of the heliosphere.