Data Set Overview
=================
 
    Dust Impact Detection System (DIDSY) consists of six
    independent subsystems with the primary aim of
    registering the impacts of all particulates of
    significant mass incident on the probe during the
    post-perihelion encounter with Comet Halley in 1986.
     Mounted on Giotto's front dust shield, the detectors
    will determine the mass spectrum of the dust, with a
    limiting sensitivity of some 10^^-17^^ g, increasing
    to the largest grain masses encountered along
    Giotto's trajectory through the cometary environment
    with an ultimate spatial resolution of some 70 km.
     An additional detector is located on the rear shield
    to monitor those dust particles (m > ~ 5 X 10^^-7^^
    g) that are able to penetrate the front dust shield.
     An ambient plasma monitor is also incorporated into
    DIDSY to measure the inJpact plasma generated by both
    dust and gas impacts on the spacecraft.  The system
    is controlled and its data processed by a
    microprocessor-based system that allows the wide
    range of anticipated impact rates (varying from a few
    per minute, to ~ 10^6 s^^-1^^ at closest approach) to
    be handled.  The instrument weighs 2.26 kg and
    consumes 1.9 W of power during normal operation.
 
 
    Sampling parameter       : TIME
    Sampling parameter unit  : SECOND
    Data set parameter       : MASS
    Data set parameter unit  : COUNTS

Confidence Level Overview
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N/A