Journal
PLANETARY AND SPACE SCIENCE
Volume 55, Issue 12, Pages 1772-1792Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.pss.2007.01.014
Keywords
space instrumentation; ion and electron analysers; energetic neutral atom imagers; Venus
Categories
Funding
- Science and Technology Facilities Council [PP/E001173/1] Funding Source: researchfish
- UK Space Agency [PP/D000831/1] Funding Source: researchfish
- STFC [PP/E001173/1] Funding Source: UKRI
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The general scientific objective of the ASPERA-4 (Analyser of Space Plasmas and Energetic Atoms) experiment is to study the solar wind-atmosphere interaction and characterise the plasma and neutral gas environment in the near-Venus space through energetic neutral atom (ENA) imaging and local charged particle measurements. The studies to be performed address the fundamental question: How strongly do the interplanetary plasma and electromagnetic fields affect the Venusian atmosphere? The ASPERA-4 instrument comprises four sensors; two ENA sensors, electron and ion spectrometers. The neutral particle imager (NPI) provides measurements of the integral ENA flux (0.1-60 keV) with no mass and energy resolution but relatively high angular resolution. The neutral particle detector (NPD) provides measurements of the ENA flux, resolving velocity (0.1-10keV) and mass (H and 0) with a coarse angular resolution. The electron spectrometer (ELS) is a standard top-hat electrostatic analyser in a very compact design. These three sensors are located on a scanning platform providing a 4 pi coverage. The instrument also contains an ion mass composition sensor, IMA (ion mass analyser). Mechanically, IMA is a separate unit electrically connected with the ASPERA-4 main unit. IMA provides ion measurements in the energy range 0.01-36keV/q for the main ion components H+, He++, He+, and the ion group with M/q 20-80amu/q. (C) 2007 Elsevier Ltd. All rights reserved.
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