Structures and Spectral Variations of the Outer Heliosphere in IBEX Energetic Neutral Atom Maps

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Science  13 Nov 2009:
Vol. 326, Issue 5955, pp. 964-966
DOI: 10.1126/science.1180927

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  1. Fig. 1

    ENA spectra from several regions. Measurements were transformed into the rest frame of the Sun. Average fluxes from 24° longitude × 12° latitude areas in longitudinal slices centered on the heliospheric (A) nose (λ = 255°), (B) tail, and (C) right flank (60° from the nose) are shown. The green spectra are from low ecliptic latitudes (–30° ≤ β ≤ 30°), and the blue and red spectra are from northern (β ≥ 54°) and southern (β ≤ –54°) polar regions, respectively. The low-latitude spectra with the highest flux in (A) and (C) are from latitudes centered on –12° and –24° and contain the ribbon. The north latitude spectra with the highest flux in (B) also contain the ribbon. (D) Spectra from 20° × 20° regions centered on the nose (red) and tail (blue) and fit over nine energy passbands of IBEX. Typical error bars in (D) represent counting statistics and systematic errors of ±20% for IBEX-Hi and ±30% for IBEX-Lo.

  2. Fig. 2

    Global spectral variation with latitude and within the ribbon. The variance-weighted mean of κ for the ribbon (red) and globally distributed flux outside the ribbon (black) are calculated using three adjacent IBEX-Hi energy passbands centered on (A) 1.7 keV and (B) 2.7 keV. Error bars represent errors in the weighted mean. The 2.7-keV ENA flux map (C) is centered on ecliptic (λ, β) = (221°, 39°) and shows three regions of the ribbon. (D) Spectra from these three regions are derived from the average ENA flux in areas 6° in longitude by 18° in latitude centered on the ribbon.

  3. Fig. 3

    The product of the ion pressure ΔPion in the heliosheath and the radial thickness L of the ENA emission in units of pdynes cm−2 AU over the energy range from 0.2 to 6 keV that includes the 0.44-keV passband of IBEX-Lo and the 0.7-, 1.1-, 1.7-, 2.7-, and 4.3-keV passbands of IBEX-Hi. The black swath is data removed because of poor statistics in the IBEX-Lo energy passband.

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