Physics
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusmsa23b..01b&link_type=abstract
American Geophysical Union, Spring Meeting 2004, abstract #SA23B-01
Physics
5443 Magnetospheres (2756), 6225 Mars, 6297 Instruments And Techniques
Scientific paper
The scientific objective of the ASPERA-3 experiment is to study the solar wind - atmosphere interaction and characterize the plasma and neutral gas environment in the near-Mars space through energetic neutral atom (ENA) imaging and in-situ ion and electron measurements. 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 a comparatively high angular resolution of 4.6° ×11.5° . 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 of 5° ×30° . The ENA detection technique is based on the atom - surface interaction. The Electron Spectrometer (ELS) is a standard top-hat electrostatic analyzer in a very compact design covering the energy range 0.01 - 20 keV with an energy resolution of 8%. Ion mass resolving sensor IMA (Ion Mass Analyzer) provides ion measurements in the energy range 0.01 - 32 keV/q for the main ion components with mass/charge 1, 2, 4, 8, 16, and the molecular ion group (20 - 40) amu/q. The instantaneous field of view is 4.6° ×360° . Electrostatic sweeping performs the elevation (±45° ) coverage. We present and discuss the first ASPERA-3 measurements during the cruise phase and at Mars. The focus will be given to (1) ENA observations in the interplanetary medium, (2) identification of the main plasma domains in the combined ion / electron data, (3) plasma observations inside the obstacle.
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