A Residual Source of Energetic Neutral Atoms Across the Sky Obtained by the Neutral Particle Detector on board Venus Express

Details A Residual Source of Energetic Neutral Atoms Across the Sky Obtained by the Neutral Particle Detector on board Venus Express A Residual Source of Energetic Neutral Atoms Across the Sky Obtained by the Neutral Particle Detector on board Venus Express

Nov 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aipc.1183..102b&link_type=abstract

SHOCK WAVES IN SPACE AND ASTROPHYSICAL ENVIRONMENTS: 18th Annual International Astrophysics Conference. AIP Conference Proceedin

Astronomy and Astrophysics

Astrophysics

Sky Surveys, Explosions, Galaxy, Solar Wind, Interstellar Matter, Astronomical Observations, Energetic Particles, Kinematics, Dynamics, And Rotation, Particle Emission, Solar Wind, Heliopause And Solar Wind Termination

Scientific paper

We have surveyed the sky for residual energetic neutral atom (ENA) signals in the energy range of 0.2-3.0 keV. Approximately three years of data obtained by the Neutral Particle Detector (NPD) on board Venus Express (VEX) from May 2006 through August 2009 have been analyzed. After applying strict viewing criteria to minimize all known signals and subtracting the UV background from the Milky Way, we find a residual energy spectral shape with a ledge/bump at around 0.5 keV and a break in the spectral slope at about 1.0 keV. When the ENA spectrum is divided by the energy dependent charge exchange cross section its slope above 1 keV has a spectral power-law index of 1.5, which is consistent with that measured in-situ in the inner heliosheath (HS) by the Low-Energy Charged Particle (LECP) instrument (>40 keV) on board Voyager-1 (V1). The ledge/bump at about 0.5 keV appears consistent with twice the plasma flow velocity obtained by the V1 measurements in the inner HS.

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