Combining the HSTOF ENA Observations With Voyager ion Data to Image the Forward Heliosheath

Details Combining the HSTOF ENA Observations With Voyager ion Data to Image the Forward Heliosheath Combining the HSTOF ENA Observations With Voyager ion Data to Image the Forward Heliosheath

Dec 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsh21b1595c&link_type=abstract

American Geophysical Union, Fall Meeting 2008, abstract #SH21B-1595

Physics

2109 Discontinuities (7811), 2114 Energetic Particles (7514), 2124 Heliopause And Solar Wind Termination, 2126 Heliosphere/Interstellar Medium Interactions, 2164 Solar Wind Plasma

Scientific paper

Since 1996 the HSTOF instrument on board SOHO has been measuring the flux of hydrogen and helium ENA. The most likely source of these atoms is neutralization of the energetic ions in the heliosheath by charge exchange with low energy neutral gas. After the crossing of the termination shock by Voyagers, the energy spectra of these ions were measured in situ. The energy range of the HSTOF ENA measurements overlaps with the Voyager LECP. By comparing the measured ENA fluxes with those of the parent ions we can thus calculate the column density of the neutral hydrogen gas in the forward heliosheath required to account for the observed ENA flux. This permits us to estimate the thickness of the forward heliosheath. We present our recent results which take into account both Voyager 1 and Voyager 2 ion spectra. We also discuss the relationship between the HSTOF and the STEREO ENA data and their implications for the structure of the forward heliosheath.

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