Fig. 7.
Estimations of the tail/apex ENA flux ratio as the function of time, based on the results from IBEX (solid lines) and INCA (dashed lines). The following cases are shown: (1) INCA, ENA energy 35−55 keV; (2) INCA, ENA energy 5−13 keV; (3) IBEX, ENA energy 4.3 keV; and (4) IBEX, ENA energy 0.7 keV. In the case of INCA, the ENA flux from the nose direction is replaced by the flux from Voyager 1 or Voyager 2 directions. See the text for detailed description.
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