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The Interstellar Boundary Explorer (IBEX) has been measuring fluxes of theEnergetic Neutral Atoms (ENAs) using the IBEX-Hi (0.3 -- 6 keV) instrumentsince 2008. We have developed a numerical time-depended code to calculateglobally distributed flux (GDF) of hydrogen ENAs employing both 1) 3Dkinetic-MHD model of the global heliosphere and 2) reconstruction of atomtrajectories from 1 au, where they are observed by IBEX, to the point of theirorigin in the inner heliosheath (IHS). The key factor in the simulation is adetailed kinetic consideration of the pickup ions (PUIs), the supra-thermalcomponent of protons in the heliosphere, which is "parental" to the ENAs andoriginates in the region of the supersonic solar wind being picked by theheliospheric magnetic field. As a result of our study, we have concluded that(1) the developed model is able to reproduce the geometry of the multi-lobestructure seen in the IBEX-Hi GDF maps, (2) the GDF is extremely sensitive tothe form of the velocity distribution function of PUIs in the IHS, and theaccounting for the existence of an additional energetic population of PUIs isessential to explain the data, (3) despite a relatively good agreement, thereare some quantitative differences between the model calculations and IBEX-Hidata. Possible reasons for these differences are discussed.

Heliospheric Energetic Neutral Atoms: Non-stationary Modeling and Comparison with IBEX-Hi data