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The brightest and most surprising feature in the first all-sky maps ofEnergetic Neutral Atoms (ENA) emissions (0.2-6 keV) produced by theInterstellar Boundary Explorer (IBEX) is an almost circular ribbon of a~140{\deg} opening angle, centered at (l,b) = (33{\deg}, 55{\deg}), coveringthe part of the celestial sphere with the lowest column densities of the LocalInterstellar Cloud (LIC). We propose a novel interpretation of the IBEX resultsbased on the idea of ENA produced by charge-exchange between the neutral Hatoms at the nearby edge of the LIC and the hot protons of the Local Bubble(LB). These ENAs can reach the Sun's vicinity because of very low columndensity of the intervening LIC material. We show that a plane-parallel orslightly curved interface layer of contact between the LIC H atoms (n_H = 0.2cm^-3, T = 6000-7000 K) and the LB protons (n_p = 0.005 cm^-3, T ~ 10^6 K),together with indirect contribution coming from multiply-scattered ENAs fromthe LB, may be able to explain both the shape of the ribbon and the observedintensities provided that the edge is < (500-2000) AU away, the LIC protondensity is (correspondingly) < (0.04-0.01) cm^-3, and the LB contains ~1% ofnon-thermal protons over the IBEX energy range. If this model is correct, thenIBEX, for the first time, has imaged in ENAs a celestial object from beyond theconfines of the heliosphere and can directly diagnose the plasma conditions inthe LB.

A possible generation mechanism for the IBEX ribbon from outside the heliosphere