####Pioneer 11 Charged Particle Instrument Bundle  Readme

####Brief Bundle Description

This bundle contains data taken by the Pioneer 11 fields and particles
instruments from the Jupiter and Saturn flybys. Data from the Charged Particle
Instrument (CPI) is included.

The charged particle detector had four measuring systems: two
particle telescopes that operated in interplanetary space, and two
that measured the intense trapped electrons and protons inside the
Jovian radiation belts.

During the interplanetary phase of the mission, before and after
encounter with Jupiter, the experiment sought to identify the
chemical elements hydrogen, helium, lithium, beryllium, boron,
carbon, and nitrogen, and to separate hydrogen, deuterium, helium-3
and helium-4 in an attempt to differentiate between particles coming
from the Sun and those from the Galaxy. The instrument was also used
to determine how the streams of high energy particles from the Sun
travel through interplanetary space. The main telescope of seven
solid-state detectors measured the composition of cosmic rays from 1
to 500 million electron volts (MeV), and a three-element, low
energy telescope measures 0.4 to 10 MeV protons and helium nuclei.

Two types of sensors were used to cope with the extremely high
intensities of trapped radiation in the magnetosphere of Jupiter. A
solid-state electron current detector, operating below -40
degrees C, was designed to detect those electrons above 3 MeV that
generate the decimetric radio waves emitted from Jupiter. A trapped
proton detector contains a foil of thorium which undergoes nuclear
fission when impacted with protons above 30 MeV, but is insensitive
to electrons.

Users of these data are encouraged to acknowledge both the PDS and the
principal investigators of the instruments whose data is used in analysis
in all publications.

####Bundle Organization:

Data files are stored in ASCII (.TAB file extension).
PDS4 documentation is all LBLX. There is an LBLX label for every product in the
archive.

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####Pioneer 11 CPI 15 Minute Data Collection
This collection contains Pioneer 11, 15 minute averages of the Jupiter, Saturn,
interplanetary solar wind data, and daily heliocentric coordinates of Pioneer 11.

* (urn:nasa:pds:p11-cpi:data-15min)

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####Pioneer 11 CPI Hourly Data Collection
This collection contains Pioneer 11 hourly averages of Jupiter, Saturn, interplanetary
solar wind data, and daily heliocentric coordinates of Pioneer 11.

* urn:nasa:pds:p11-cpi:data-1hr)

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####Pioneer 11 CPI Daily Data Collection
This collection contains Pioneer 11 daily averages of Jupiter, Saturn, interplanetary
solar wind data, and daily heliocentric coordinates of Pioneer 11.

* (urn:nasa:pds:p11-cpi:data-1day)

These data were originally archived in the following PDS3 data sets:

* [P11-J-SW-CPI-4-SUMM-1HR-V1.0] (https://doi.org/10.17189/1519790)
* [P11-J-SW-CPI-4-SUMM-15MIN-V1.0] (https://doi.org/10.17189/1520126)

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###Contacts


For questions or problems regarding this volume, please contact the PDS/PPI
PDS operator:

  Email             pds_operator@igpp.ucla.edu

For questions regarding PDS Standards or other bundles available from the
PDS, please contact PDS Operator at the PDS Central Node (at JPL):

  Email             pds_operator@jpl.nasa.gov