CASSINI UVIS RING SOLAR OCCULTATION ARCHIVE -------------------------------------- 1. Introduction This data set contains derived radial occultation profiles of the rings of Saturn based on solar occultation observations made with the Cassini UVIS instrument between June 2005 and June 2017. Details of the data processing involved in the production of this data set are provided in Jarmak et al. 2022, Solar Occultation Observations of Saturn's Rings with Cassini UVIS, Icarus 388, 115237, 2022, DOI 10.1016/j.icarus.2022.115237. 2. File Formats Files in this bundle are named according to PDS standards, where the 1-3 characters after the period indicate the file type. The file types used in this bundle are: PDS4 labels *.xml ASCII tables *.tab PDF/A formatted documentation *.pdf Text documentation *.txt Collection inventory *.csv Browse product plots *.jpg Further details of the reserved file name extensions can be found in the NASA PDS4 Data Standards document, section 6C.1.6, located online at https://pds.nasa.gov/datastandards/documents/sr/v1/StdRef_1.20.0.pdf 3. PDS Labels Every file in this data set (except this readme) is described by an associated PDS4 label, i.e. the label provides metadata for its associated product. See the PDS4 Concepts document (DOI 10.17189/gqaa-fw86) for a complete description of the PDS4 label format. This document can be obtained online at: https://pds.nasa.gov/datastandards/documents/concepts/Concepts_1.20.0.pdf 4. Directory Structure This bundle is organized in a directory tree as follows: root directory | |--readme.txt This file | |--bundle.xml Label for bundle, describing members of the bundle | and references etc | |--browse/ Directory containing browse products (images) for | | this data set | | | |--uvis_*.jpg Plots of signal, transparency, and normal | | optical depth for a single occultation; | | ingress and egress portions are given in | | separate files | | | |--uvis_*.xml Label for associated browse product | | |--context/ Directory containing context information related to | | the archive; such as spacecraft, instruments, targets etc. | | | |--collection_context.csv List of context product LIDs, with first column designating | | whether it is a primary (P) or secondary (S) member | | | |--collection_context.xml Label for the associated collection file | | |--data/ Directory containing ring occultation profiles in ASCII | | table files | | | |--uvis_*.tab Ring radial profiles from a single occultation; | | ingress and egress portions are given in | | separate files | | | |--uvis_*.xml Label for the associated data product | | | |--collection_data.csv List of members of the data collection, indicating whether a | | primary (P) or secondary (S) member | | | |--collection_data.xml Label for the associated collection file | | | |--supplemental/ Directory containing supplemental ring occultation profile for Rev 62 E | | | |--uvis_*supplement.tab Ring radial profile for Rev 62 E | | | |--uvis_*supplement.xml Label for associated supplemental tab file | | |--document/ Directory containing documentation | | | |--collection_document.csv List of members of the document collection, indicating whether a | | primary (P) or secondary (S) member | | | |--collection_document.xml Label for the associated collection file | | | |--?-RingSolarOccAtlas_*.pdf Atlases for all solar occultations observed by UVIS over the course of the Cassini mission | | | |--?-RingSolarOccAtlas_*.xml Label for atlas | | |--xml_schema/ Directory identifying the XML schema products associated with this bundle | | | |--collection_xml_schema.csv List of members of the XML schema collection, indicating whether a | | primary (P) or secondary (S) member | | | |--collection_xml_schema.xml Label for associated schema file 5. Notes on bundle contents 5.1 Data Selection Only reduced data are provided in this data set. The source raw UVIS data may be obtained from the PDS. The data files in the primary data are the original files submitted to the PDS by members of the UVIS team. Version 1.0 - Occultation profiles for solar occultations obtained during the primary mission, obtained between June 2005 and June 2017. - Browse products including signal, transparency, and normal optical depth as a function of ring plane radius. 5.2 Data Files The file naming conventions for data products in the data/ directory are as follows: file name root = uvis_euv_yyyy_ddd_dir, where uvis_euv = designation of data obtained with the euv solar port on uvis instrument yyyy_ddd = date of the beginning of the observation solar_time_series = designation for solar occultations dir = either ingress or egress for occultation direction Data files provided in this bundle are ASCII tables. These contain comma separated values in fixed width columns. For each data file, a PDS4 label is provided containing additional parameters. The data tables include a column of note flags identifying any issues with the data on that row. Possible values are: 0: Radius and longitude are based on Saturn equatorial plane. 1: Background is estimated from other occultations. No direct measurement of background in this occultation. 2: Star signal is estimated from other occultations. No direct measurement of unocculted star in this occultation. 4: Ring plane radius offsets due to instrumental and/or geometric effects. 8: Line of sight intersects planet. 16: Sun is outside significant portion of FOV. 32: The data are corrupted. In circumstances where multiple flags apply to an observation the flag values are summed. We provide a quick key to all summed values that appear in the data delivery here. 3: No background or unocculted signal estimate available for optical depth measurements 10: Background estimated from other occultation for normal optical depth and line of sight intersects Saturn 12: Ring plane radius offsets due to instrumental and/or geometric effects and line of sight intersects Saturn 20: Ring plane radius offsets due to instrumental and/or geometric effects and the Sun was outside significant portion of the FOV. 35: Corrupted data, background and unoccupied signal estimated from other occultations 52: Corrupted data, Sun mostly outside FOV for occultation, and ring plane radius offsets due to instrumental and/or geometric effects Note that for every occultation, the radius and longitude are based on the Saturn equatorial plane, which corresponds to a note flag of 0. A flag value of 0 is therefore included in each note flag column greater than or equal to 0. 5.3 Browse Products The browse directory contains plots of signal versus ring plane radius for each occultation. The naming scheme is the same as the corresponding data file. The browse products include the signal as a function of ring plane radius, and for all except Rev 243 (I) (due to limitations in data) additionally includes plots of the normal optical depth based on the choice of background and unocculted signal described in Jarmak et al., 2022, and the transparency. 5.4 Atlas Documents The document directory contains PDFs of Volumes 1 and 2 of the Ring Solar Occultation Atlas that contain tables with relevant information pertaining to each occultation along the line of sight to the Sun, the signal in counts/s as a function of ring plane radius, the radial ring plane resolution of the occultation as a function of ring plane radius, the azimuthal angle as a function of ring plane radius, and geometry visualizations indicating the position of the UVIS EUV solar port field of view at mid-occultation. 5.5 Further Noted Issues A supplemental folder has been added as a subdirectory to the data folder. This folder contains the data table and associated XML label file for a data file associated with Rev 62 (E) that differed in the number of spectral elements, spatial elements, time integration from the main Rev 62 (E) data provided in the data directory. This supplemental file did not contain any pertinent rings information and was therefore excluded from the analysis described in Jarmak et al. 2022. However, for the sake of completeness we provide the data products produced from this file in the supplemental directory. We also note that Revs 9, 11, and 172 have seemingly systematic offsets in the observed Locations of ring features compared to Stellar occultation observations, we investigated this issue and found it was an inherent aspect of the data and denoted a flag of 4 to correspond to these occultations (see section 5.2). 6. Peer Review This bundle has undergone PDS peer review (both by scientists with relevant expertise and for PDS4-compliance). 7. Citing This Data Set The following is the recommended information to include in a (e.g. journal) citation of this data set: "Jarmak, S.G., Becker, T.M., and Colwell, J.E., Saturn Ring System Solar Occultations Observed by Cassini UVIS. PDS Ring-Moon Systems (RMS). DOI 10.17189/1523014." 8. Contact Information For questions concerning this data set, please contact: Mia Mace / Matthew Tiscareno Ring-Moon Systems Node, NASA PDS SETI Institute 339 Bernardo Ave. Mountain View, CA 94043 Email: mmace@seti.org Email: mtiscareno@seti.org Stephanie Jarmak Southwest Research Institute 6220 Culebra Rd San Antonio, TX 78238 Email: sjarmak@swri.org / stephanie.jarmak@cfa.harvard.edu