Investigations of the Venus plasma environment with the ASPERA-4 experiment on the ESA Venus Express mission

Details Investigations of the Venus plasma environment with the ASPERA-4 experiment on the ESA Venus Express mission Investigations of the Venus plasma environment with the ASPERA-4 experiment on the ESA Venus Express mission

Apr 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003eaeja.....3117b&link_type=abstract

EGS - AGU - EUG Joint Assembly, Abstracts from the meeting held in Nice, France, 6 - 11 April 2003, abstract #3117

Computer Science

Scientific paper

For the ESA Venus Express mission to be launched in November 2005 Analyzer of Space Plasmas and Energetic Atoms (ASPERA-4) has been selected as a part of the core payload. The instrument is a copy of the experiment Aspera-3 to be flown to Mars on the ESA Mars Express mission. The general scientific objective of the ASPERA-4 experiment, to study the solar wind - atmosphere interaction and characterize the plasma and neutral gas environment in the near-Venus space through energetic neutral atom (ENA) imaging, are similar to the Martian mission. We thus have the unique opportunity to investigate two non-magnetized planets with identical instrumentation. The ASPERA-3 instrument comprises four sensors, two ENA sensors and an electron and ion spectrometer. The Neutral Particle Imager (NPI) provides measurements of the integral ENA flux in the energy range 0.1 - 60 keV with no mass and energy resolution but comparatively high angular resolution 4.6 deg. x 11.5 deg. The Neutral Particle Detector (NPD) provides measurements of the ENA flux in the energy range 0.1 - 10 keV, resolving velocity and mass (H and O) with a coarse angular resolution. The Electron Spectrometer (ELS) is a standard top-hat electrostatic analyzer in a very compact design. These three sensors are located on a scanning platform to cover ideally the full sphere. The instrument also contains a mass resolving sensor, IMA (Ion Mass Analyzer). IMA provides ion measurements in the energy range 0.01 - 30 keV/q for the main ion components ( 1, 2, 4, 16 amu/q) and the group of molecular ions (20 - 80 amu/q). The instantaneous field of view is 4.6 deg. x 360 deg. Electrostatic sweeping performs the elevation (90 deg.) coverage.

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