Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006agufm.p51b1193g&link_type=abstract
American Geophysical Union, Fall Meeting 2006, abstract #P51B-1193
Other
5435 Ionospheres (2459), 5494 Instruments And Techniques, 6295 Venus
Scientific paper
We present early observations of energetic neutral atoms (ENA) obtained at Venus by the Neutral Particle Detector (NPD) in the 100 eV - 1 keV range on board the Aspera-4 experiment. Since Venus has no significant intrinsic magnetic field, the solar wind interacts strongly with the upper atmosphere and ionosphere. Ions produced are picked up by the solar wind electric field. While some pick up ions are swept away completely by the solar wind, some re-impact the upper atmosphere and some charge exchange with the neutral upper atmosphere forming ENAs that also can escape the system, so-called planetary ENAs. ENAs are also expected to be produced from the solar wind protons charge exchanging directly with the neutral upper atmosphere, so-called solar-wind ENAs. In addition, a neutral particle signature around 600 eV (assuming hydrogen) that clearly does not originate from Venus has been reported by other workers. We present our initial analysis of the NPD observations.
Barabash Stas
C:son Brandt Pontus
Grigoriev Alexei
Roelof Edmond C.
Sotirelis Thomas
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