PDS_VERSION_ID = PDS3
LABEL_REVISION_NOTE = "Initiated JMAFI, 2004-03-01"
OBJECT = INSTRUMENT
INSTRUMENT_HOST_ID = P11
INSTRUMENT_ID = HVM
OBJECT = INSTRUMENT_INFORMATION
INSTRUMENT_NAME = "HELIUM VECTOR MAGNETOMETER"
INSTRUMENT_TYPE = "MAGNETOMETER"
INSTRUMENT_DESC = "
Instrument Overview
===================
Magnetic fields affect the plasma of electrically charged particles
in interplanetary space and control the flow of this plasma as it
spreads out from the Sun across the orbits of the planets. Before
the mission of Pioneer 10 these effects had been only observed and
measured out to the orbit of Mars. Scientists were still uncertain
about many specific details about the interplanetary medium and
particularly the extent to which the Sun's magnetic field controlled
the flow of plasma beyond Mars to the outer regions of the Solar
System. The outer boundaries of this influence were vague, and
interactions between the plasma and fields of the Solar System and
those of the Galactic System puzzled scientists. Pioneer 10 and
Pioneer 11 explored the regions beyond the orbit of Jupiter and made
measurements that helped to define the transition region of solar
influence (heliosphere).
This experiment used a sensitive magnetometer at the tip of a
lightweight boom, which extended 6.6 meters from the center of the
spacecraft to reduce the effects of the residual spacecraft magnetic
field, and to assist the balance of this spin stabilized spacecraft.
The helium vector magnetometer measured the fine structure of the
interplanetary field, maped the Jovian field, and provided field
measurements to evaluate solar wind interaction with Jupiter. The
magnetometer operated in one of eight different ranges, the lowest
of which covered magnetic fields from +/-0.01 to +/-4.0 gamma; the
highest, fields up to +/-140,000 gamma (i.e. +/-l.4 Gauss). The
ranges were selected by ground command or automatically by the
instrument itself as it reached the limits of a given range.
The sensor for the magnetometer consisted of a cell filled with
helium that is excited by electrical discharge at radio frequencies
and infrared optical pumping. Changes in helium absorption caused by
magnetic fields passing through the magnetometer are measured by an
infrared optical detector.
['Instrument Overview' was adapted from FIMMELETAL pp. 49-50.]"
END_OBJECT = INSTRUMENT_INFORMATION
OBJECT = INSTRUMENT_REFERENCE_INFO
REFERENCE_KEY_ID = "FIMMELETAL1977"
END_OBJECT = INSTRUMENT_REFERENCE_INFO
OBJECT = INSTRUMENT_REFERENCE_INFO
REFERENCE_KEY_ID = "SMITHETAL1974B"
END_OBJECT = INSTRUMENT_REFERENCE_INFO
END_OBJECT = INSTRUMENT
END
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