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OBJECTIVES
The Voyager Cosmic Ray Subsystem (CRS) is designed to exploit to
the fullest practical degree the proposed trajectories of
Voyager-1 and -2. The significance of these measurements will be
greatly enhanced by concurrent measurements with similar particle
telescopes on satellites such as the Pioneers, IMPs, and similar
series in near-earth orbits. The principal scientific objectives
of this experiment are:
- To measure the flow patterns of energetic solar and
galactic particles separately in the inter-planetary field.
To interpret this measurement, simultaneous determination
of the energy spectrum, radial gradient, distribution, and
streaming parameters is required for each nuclear species
and over as wide an energy range as is practicable.
- To measure the energy spectra, and isotopic composition of
galactic and solar cosmic rays from the lowest practical
energies up to ~800 MeV/nucleon and (by use of objective
1) to unfold the primary flare and interstellar spectrum.
- To measure the time variations of the differential energy
spectra of electrons, hydrogen and helium nuclei over the
corresponding energy intervals. During flare events, to
obtain time histories; during quiet times, to relate gross
time variations to those near earth thus deducing a
spatial gradient for galactic cosmic rays.
- To study the energy spectra, time variations and spatial
gradients associated with recurrent and non-flare
associated interplanetary proton and helium streams and to
define the related solar or inter-planetary acceleration
processes.
- To provide information on the energetic particle
distribution surrounding Jupiter and Saturn.
- To try to determine the extent of the solar cavity, the
energetic particle phenomena occurring at this interface
and the cosmic ray density in nearby interstellar space.
To accomplish these objectives CRS makes the following measurements:
- Galactic cosmic ray protons and Solar proton intensities in
the energy range 1.8 - 200 MeV
- Galactic cosmic ray helium and Solar helium intensities in
the energy range 1.8 - 500 MeV/nucleon
- Galactic and Solar electron intensities in the energy range
0.2- 13.0 MeV
- Li,Be,B,C,N,O,F,Ne intensities and their isotopic composition
in the energy range 6 MeV/nuc - 200 MeV/nuc
- Integral flux of IONS > 70 MeV
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