Copyright WDC C1 for STP at RAL.

This was supplied by the Mullard Space Science Laboratory. The instrument used twin electrostatic analysers to measure the ion distribution over the energy range from 10 eV/q to 20 keV/q. It could be commanded to operate in a variety of modes: (i) to measure the solar-wind distribution (SW data), which is beam-like because ion thermal velocities are generally less than the bulk velocity of the solar wind; (ii) to measure the full three-dimensional ion distribution (FTR or "fine time resolution" data), which is more suitable for the hot plasma in the magnetosphere where flow velocities are small; (iii) to apply these two modes in alternate spins (e.g. for measurements in the boundary layer). The instrument had sufficient resolution to be able to make any of these different measurements within a spin period. Full details are available in the following paper:

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Produced by World Data Centre C1 for STP.