Energetic neutral atoms from the heliosheath

Details Energetic neutral atoms from the heliosheath Energetic neutral atoms from the heliosheath

Sep 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aipc..858..269w&link_type=abstract

PHYSICS OF THE INNER HELIOSHEATH: Voyager Observations, Theory, and Future Prospects; 5th Annual IGPP International Astrophysics

Astronomy and Astrophysics

Astrophysics

5

Neutral Particles, Energetic Particles, Composition, Energy Spectra And Interactions

Scientific paper

We present the measurement and analysis of hydrogen energetic neutral atoms (ENAs) recorded with the ASPERA-3 instrument on board Mars Express during the cruise phase and the Mars orbit phase. We conclude that the origin of these ENAs is the inner heliosheath. The ENA energy spectra are all very similar and can be fitted well by a two-component power law. The ENA fluxes, integrated from 0.3 keV to 10 keV, vary in the range of 5 . 103 to 105 cm-2 sr-1 s-1. The present ENA data fit together well with earlier ENA data at higher energies, which have their origin also in the inner heliosheath. Comparison of the measured ENA energy spectra with results from several heliospheric models show that some of these models predict significantly lower ENA fluxes at Earth orbit.

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