PDS3















    Voyager pic
    Instrument Characteristics
    The Voyager 1 Ultraviolet Spectrometer (UVS) is a compact Wadsworth mounted objective grating spectrometer that covers the wavelength range of 0.0535 to 0.1702 micron for Voyager 1 and 0.0513 to 0.1680 micron for the Voyager 2. A mechanical 'collimator’ defines the main 'airglow' field-of-view (FOV) of 0.10 x 0.87 degrees full-width-half-maximum (FWHM). Light passing through the collimator strikes the concave diffraction grating at near normal incidence. The grating disperses and focuses light onto a 1-d array detector that records individual photoevents. An auxiliary field-of-view for solar occultation experiments is offset 20 degrees from the airglow field by a small mirror near the front of the collimator. Using this 'occultation port', UVS can view the Sun without pointing the main field, and those of other coaligned instruments, directly at the Sun. The occultation field is 0.25 x 0.87 degrees. A sunshade prevents illumination of the main entrance aperture by the sun during occultation observations.

    UVS Science Objectives
    • To determine the scattering properties of the lower planetary atmospheres.
    • To determine the distribution of constituents with height.
    • To determine the extent and distribution of hydrogen corona of the planets and satellites.
    • To investigate night airglow and auroral activity.
    • To determine the UV scattering properties and optical depths of planetary rings.
    • To search for emissions from the rings and from any ring "atmosphere."


    References Helpful in Scoping the Mission
    Mission Description
    Spacecraft Description

    The UVS Data
    Maps of Hydrogen Lyman-alpha and Molecular Hydrogen bands derived from Voyager 1 and 2 Ultraviolet Spectrometer (UVS) observations obtained during North/South mapping sequences of Jupiter. The incorporated pointing information has been updated with image navigation techniques (C-smithed). Data are grouped in subdirectories for each of the two planets; within each subdirectory are the data files (further separated by spacecraft) and the associated PDS label files.

    The following volumes contain reformatted Voyager 2 UVS spectral data records with merged ancillary information derived from the footprint SEDR files. All data for which footprint SEDR information was available are included, except for certain high background noise time periods near closest approach to Jupiter.

    The UVS calibrated (RDR) data are presented in a binary table form. Each data file consists of the data from a single day at whatever time resolution the UVS data were originally transmitted from the spacecraft. The structure of the binary files is defined.

    Jupiter References

    Broadfoot, A.L., et al., Extreme Ultraviolet Observations from Voyager 1 Encounter with Jupiter, Science, 204, 979, 1979.

    Broadfoot, A.L., et al., Overview of Voyager Ultraviolet Spectrometry Results Through Jupiter Encounter, J. Geophys. Res., 86, 8259-8284, 1981.


    Data
    Calibrated
    vg_2201 VOYAGER 1 JUPITER ENCOUNTER:1979-01-04 TO 1979-02-08
    vg_2202 VOYAGER 1 JUPITER ENCOUNTER:1979-02-09 TO 1979-03-03
    vg_2203 VOYAGER 1 JUPITER ENCOUNTER:1979-03-07 TO 1979-04-09
    vg_2204 VOYAGER 2 JUPITER ENCOUNTER:1979-05-25 TO 1979-06-15
    vg_2205 VOYAGER 2 JUPITER ENCOUNTER:1979-06-16 TO 1979-07-07
    vg_2206 VOYAGER 2 JUPITER ENCOUNTER:1979-07-12 TO 1979-08-11
    Derived
    vg_2101 VG1/VG2 JUPITER UVS 5 BRIGHTNESS NORTH/SOUTH MAPS V1.0


    Saturn References

    Broadfoot, A.L., et al., Extreme Ultraviolet Observations from Voyager 1 Encounter with Saturn, Science, 212, 206, 1981.


    Data
    Calibrated
    vg_2207 VOYAGER 1 SATURN ENCOUNTER:1980-08-22 TO 1980-09-21
    vg_2208 VOYAGER 1 SATURN ENCOUNTER:1980-09-22 TO 1980-10-15
    vg_2209 VOYAGER 1 SATURN ENCOUNTER:1980-10-16 TO 1980-11-12
    vg_2210 VOYAGER 1 SATURN ENCOUNTER:1980-11-13 TO 1980-12-14
    vg_2211 VOYAGER 2 SATURN ENCOUNTER:1981-06-05 TO 1981-07-01
    vg_2212 VOYAGER 2 SATURN ENCOUNTER:1981-07-02 TO 1981-07-30
    vg_2213 VOYAGER 2 SATURN ENCOUNTER:1981-07-31 TO 1981-08-25
    Derived
    vg_2101 Voyager 1 & 2 Saturn UVS Brightness North-South Maps


    Titan -The Titan data are interspersed with the Saturn data. Voyager 1, the close encounter, spans 1980-08-27 to 1980-11-15 with closest approach occurring at 1980-11-11 at 9:41 at a distance of 6490 km. Voyager 2 spans 1981-06-24 to 1981-08-25 Data
    Calibrated
    vg_2207 VOYAGER 1 SATURN ENCOUNTER:1980-08-22 TO 1980-09-21
    vg_2208 VOYAGER 1 SATURN ENCOUNTER:1980-09-22 TO 1980-10-15
    vg_2209 VOYAGER 1 SATURN ENCOUNTER:1980-10-16 TO 1980-11-12
    vg_2210 VOYAGER 1 SATURN ENCOUNTER:1980-11-13 TO 1980-12-14
    vg_2211 VOYAGER 2 SATURN ENCOUNTER:1981-06-05 TO 1981-07-01
    vg_2212 VOYAGER 2 SATURN ENCOUNTER:1981-07-02 TO 1981-07-30
    vg_2213 VOYAGER 2 SATURN ENCOUNTER:1981-07-31 TO 1981-08-25


    Uranus References
    Broadfoot, A.L., et al., Ultraviolet Spectrometer Observations of Uranus, Science, 233, 74, 1986.
    Broadfoot, A.L., et al., Ultraviolet Spectrometer Observations of Uranus, Science, 233, 74, 1986.


    Data
    Calibrated
    vg_2214 Voyager 2 Uranus encounter: 1986-01-01 to 1986-01-25
    vg_2215 Voyager 2 Uranus encounter: 1986-01-25 to 1986-02-15


    Neptune References
    Broadfoot, A.L., et al., Ultraviolet Spectrometer Observations of Neptune and Triton, Science, 246, 1459, 1989.


    Data
    Calibrated
    vg_2216 Voyager 2 Neptune encounter: 1989-08-13 to 1989-09-11


    Other Documentation


    Publications - A listing of team members to facilitate literature searches.

    Observation geometry in "SPICE" format may be obtained at the NAIF node