|The Heavy Ion Counter was added to the Galileo spacecraft to monitor the environment for energetic heavy ions with the potential to cause single event upsets in the spacecraft electronics. In addition to their engineering value, these observations are of course also of scientific interest. In particular, heavy ion spectra at Jupiter can be used to study composition, diffusion, and acceleration of these particles. Other scientific goals include observations of energetic particles associated with solar flare events, of cosmic rays, and of anomalous cosmic rays.|
The Heavy Ion Counter is based on the Voyager CRS instrument and is described in an instrument paper which was part of a special Galileo issue of Space Science Reviews 60, 305-315, 1992. A good overview of the HIC instrument is also available through JPL's Galileo Mission Homepage.
For more detail the technical report, Science Requirements Document, (SRL Technical Report 85-02) can be viewed. This SRD also documents the data as it comes from the instrument.
Galileo-HIC data are carried, along with related header information, in an Instrument Packet File (IPF). Within each IPF are several data packets, structured in the standard formatted data unit (SFDU) form, which contain the actual Galileo-HIC rate count data. Overviews of the HIC IPF and SFDU data structures are available here. The original documentation on IPF/SFDU formats and a detailed description of the SFDU structure, both from Betsy Wilson and JPL, are also available. Raw IPFs are downloaded from the Galileo Science Vax Cluster (GLLSVC) at JPL and translated from binary data to a readable ASCII format with a tool called ipftoascii, which outputs rate and event data.
HIC Data Processing Routines
Available at the preceding link are documentation detailing the processing of HIC data from raw, binary data to finished data products such as rate plots and histograms. Also included here are documentation on the data processing tools.
The Galileo Mission home page at JPL provides updates on Galileo, including several encounter images. The original images are generally available from the Planetary Data System.
The Galileo Plasma Particle Investigation (PLS) homepage at the University of Iowa gives links to PLS specific documentation and data, as well as links to many Galileo related WWW sites.
Other Galileo Related Homepages:
Email Tom Garrard: firstname.lastname@example.org
Email Damien Chua: email@example.com
Email Vani Manjunath: firstname.lastname@example.org