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The Use of Numerical Simulation in the Design of the Cluster/PEACE "Top Hat" Analyzer Electron Optics
Johnstone, A. D.; Woodliffe, R. D.
The four-spacecraft Cluster mission was to be the first to attempt to measure space plasma gradients in three dimensions. The required accuracy of these gradient measurements poses a unique challenge to the accuracy with which the individual measurements must be carried out. In designing the electron analyzers of the PEACE(Plasma Electron And Curr…
Measurement of 0-25 eV Ions With a Retarding Potential Analyzer on the Cluster Ion Spectroscopy Experiment
McCarthy, M. P.; McFadden, J. P.
We describe a retarding potential analyzer (RPA) which extends the energy range of the Cluster ion spectroscopy (CIS) experiment down to 0-25 eV [Rème et al., 1993]. The CIS experiment will make comprehensive measurements of 3D ion distribution functions from 0-40 keV over the broad range of plasma regions the Cluster orbit will traverse. Mass com…
Fast and Accurate Inflight Calculations of Electron Space Plasma Parameters
Fazakerley, A. N.; Carter, P. J.; Gowen, R. A. +2 more
Satellite and rocket borne experiments impose unique requirements on the systems that control them. High input data rates from sensors have to be coupled to a limited spacecraft telemetry resource. A suite of algorithms designed to ensure the most effective possible use of the telemetry allocation for an instrument studying space plasma electrons …
Using energetic particles to probe the magnetic topology of ejecta
Richardson, I. G.
Observations of energetic particles over a wide range of rigidities can provide information on the presence of ejecta, and their structure. A large fraction of ejecta produce a local, few percent depression of the cosmic ray density. The depression typically extends over the ejecta region as determined from a range of ejecta signatures, in particu…
Cometary plasma processes
Johnstone, Alan D.
The present conference on cometary plasma processes encompasses cometary analogies of solar-wind interactions with planets, cometary plasma observations and simulations, disconnection events in Comet Halley, the spectrum and energy of solar-wind turbulence related to comets, and observations of the velocity distributions of pickup ions and ion flu…
Energetic water group ion fluxes (EH2O greater than 60 keV) in a quasiperpendicular and a quasiparallel shock front as observed during the Giotto-Halley encounter
Neubauer, F. M.; Daly, P. W.; Wenzel, K. -P. +5 more
Energetic water-group ions recorded by the Energetic Particle Analyzer/Energetic Particle Onset Admonitor (EPA/EPONA) and the Johnstone Plasma Analyzer (JPA) experiment aboard Giotto, as well as corresponding magnetic field measurements obtained, especially at the quasi-perpendicular inbound and quasi-parallel outbound bow shocks of Comet Halley, …