Ion composition experiment

Details Ion composition experiment Ion composition experiment

Jul 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978itge...16..185c&link_type=abstract

IEEE Transactions on Geoscience Electronics, vol. GE-16, July 1978, p. 185-191. Research supported by the Swiss National Scienc

Computer Science

8

International Sun Earth Explorer 3, Ion Concentration, Mass Spectroscopy, Satellite-Borne Instruments, Solar Wind, Spaceborne Experiments, Abundance, Calibrating, Microprocessors, Numerical Control, Wiener Filtering

Scientific paper

An investigation using a novel ion mass spectrometer for measuring the ionic composition of the solar wind from the ISEE-C spacecraft is described. The resolution and dynamic range of the instrument are sufficient to be able to resolve up to twelve individual ions or groups of ions. This will permit the solution of a number of fundamental problems related to solar abundances and the formation of the solar wind. The spectrometer is composed of a stigmatic Wien filter and hemispherical electrostatic energy analyzer. The use of curved electric field plates in the filter results in a substantial saving of weight with respect to a conventional filter of the same resolution and angular acceptance. The spectrometer is controlled by a microprocessor based on a special purpose computer which has three modes of operations: full and partial survey modes and a search mode. In the search mode, the instrument locks on to the solar wind. This allows four times the time resolution of the full survey mode and yields a full mass spectrum every 12.6 min.

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