Direct Measurements of Energetic Neutral Hydrogen in the Interplanetary Medium

Details Direct Measurements of Energetic Neutral Hydrogen in the Interplanetary Medium Direct Measurements of Energetic Neutral Hydrogen in the Interplanetary Medium

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006apj...644.1317g&link_type=abstract

The Astrophysical Journal, Volume 644, Issue 2, pp. 1317-1325.

Astronomy and Astrophysics

Astronomy

19

Acceleration Of Particles, Instrumentation: Detectors, Interplanetary Medium, Methods: Data Analysis, Plasmas, Sun: Solar Wind

Scientific paper

We present an analysis of hydrogen energetic neutral atoms (ENAs) measured by the ASPERA-3 instrument on board Mars Express. We focus on ENAs that have no Martian origin. The energy spectra of these ENAs are all very similar and can be fitted well by a two-component power law. The fluxes, integrated from 0.2 to 10 keV, vary between 5×103 and 105 cm-2 sr-1 s-1. We checked for possible sources for these ENAs, but we can rule out a planetary origin, a solar wind origin, contamination by UV from UV bright stars, and contamination by high-energy protons. With our present knowledge we conclude that the heliospheric termination shock is the most plausible source region.

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