The Cassini Ultraviolet Imaging Spectrograph (UVIS) has two spectrographic channels that provide images and spectra covering the ranges from 56 to 118 nm and 110 to 190 nm. A third optical path with a solar blind CsI photo cathode is used for a high signal-to- noise ratio, stellar occultation by rings and atmospheres. A separate hydrogen deuterium absorption cell measures the relative abundance of deuterium and hydrogen from their lyman-alpha emission.

The UVIS Occultations of Saturn’s Rings

  • May 3, 2019.

  • Version 2 of the dataset of Saturn ring radial profiles derived from UVIS stellar occultation data is now available. The data include ring radial profiles at 1 and 10 km resolution from more than 200 UVIS stellar occultations.

  • You may browse the dataset COUVIS_8001, or download the entire dataset COUVIS_8001 tar.gz (438 MB).

  • Version 2 of this dataset, corrects the known errors and expands the dataset coverage to the entire mission. It includes:

    • reprocessed versions of the material contained in the original version;

    • in the document directory, the Cassini_UVIS_Ring_Occultation_Atlas, an eight volume document that contains tabular lists of all UVIS stellar occultations including the star name, rev number, indication of ingress (I) or egress (E), date of the occultation, duration of the occultation, radial range coverage and elevation angle of the star. In addition, for each occultation the Atlas contains plots showing the occultation geometry and raw signal vs. radius.

    • Details of the data processing involved in the production of this data set are provided in COLWELLETAL2010.

Cassini UVIS Data Users Guide

The UVIS Tabs

The tabs associated with this page describe the UVIS data files and how to obtain and use them.

  • About UVIS Data - Discussion of the organization of the archive and links to key documents.
  • Finding Data - Suggestions on how to search the archive for specific data.
  • Access UVIS Data - Links to the data volumes - organized by data set and by temporal coverage.
  • UVIS Software - Discussion of, and links to, available UVIS calibration and image analysis software.