Fig. 2.
Energy-averaged hydrogen ENA flux measurements by HSTOF. The upper panel shows the ENA flux from the flank directions (120° − 210° and 300° − 30° ecliptic longitude sectors). The lower panel shows the flux from the forward sector (210° − 300°), the forward + flanks sector (255° ± 155°), and the heliotail sector (30° − 120° or 50° − 100°). The data are shown as ellipses; the vertical semiaxes represent statistical 1σ deviations and the horizontal axes indicate time intervals.
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