The Ion Mass Imager on the Planet-B spacecraft View Full Text


Ontology type: schema:ScholarlyArticle      Open Access: True


Article Info

DATE

1998-03

AUTHORS

O. Norberg, M. Yamauchi, R. Lundin, S. Olsen, H. Borg, S. Barabash, M. Hirahara, T. Mukai, H. Hayakawa

ABSTRACT

The Ion Mass Imager (IMI) is a light-weight ion mass composition instrument for the Japanese Planet-B mission to be launched to Mars in 1998. The objective of the Planet-B mission is to study the Martian environment with emphasis on the upper atmosphere interaction with the solar wind. IMI measures positive ions with energies between 10 eV/q and 35 keV/q and with a mass resolution high enough to resolve the most important ion species (H+, He++, He+, O++, O+, O2+). The instrument has a 360° field-of-view aperture and uses the spacecraft spin to cover almost the full unit sphere to obtain three-dimensional distribution functions every 4 s (half a spacecraft spin period). Particles are energy-filtered by a spherical electrostatic analyzer, and then mass-analysed by the magnetic separation method. The ions hit a microchannel plate assembly with a position sensitive anode divided into 32 mass channels. Together with 16 angular sectors, this system “images” the direction of motion and mass of ions. A pre-acceleration voltage of 0–4000 V is used to select the mass range, e.g., modes optimized for light ions (up to O+) and heavy ions (O+ to charged dust grains). A loss-less data compression algorithm is used in the in-flight processing software to optimize the amount of data that can be returned from Mars. More... »

PAGES

199-205

References to SciGraph publications

Identifiers

URI

http://scigraph.springernature.com/pub.10.1186/bf03352104

DOI

http://dx.doi.org/10.1186/bf03352104

DIMENSIONS

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