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Interplanetary Monitoring Platform 8 (aka IMP-J, Explorer 50) was launched on 26 October 1973, and continues to operate as of this writing (January 1999). On board is a LANL experiment, the Solar Plasma Electrostatic Analyzer.

Results from the experiment can be viewed at this site, either as

or as

Also available are PDF moment and stack plots for selected times, but regretfully the interface for obtaining those is somewhat crude.

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Last Modified $Date: 2006-06-27 13:50:55-06 $