The relationship between the all-sky distribution of energetic neutral atoms (ENAs) observable at 1 AU and the distribution and structure of plasma in the outer heliosphere is a promising tool for probing the structure of the heliospheric boundaries. The impetus for this work stems from the anticipated 2008 launch of the Interstellar Boundary Explorer , which will directly measure ENA fluxes from Earth's orbit. We find, on the basis of global simulations, that the ENA flux depends sensitively on the shape of the heliopause as well as the velocity, density, and temperature of the postshock solar wind it envelopes. This Letter is intended as a preliminary, qualitative study of how ENA maps can help us identify heliospheric asymmetries.
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Heerikhuisen et al. (2007) studied this question.
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