Currently available data extend through November 15 2020 (Ls 315 MY 35)
                  (MAVEN Mars orbit insertion occurred Sep 21, 2014; Ls 199.8, MY 32)

    The Stellar Occultation Mode
    The stellar occultation mode consists of data products from the different processing level collections (raw, calibrated, processed, derived).Stellar occultation campaigns are carried out at specific times (See Occultation Listing (csv) for details of specific campaigns).

    Software Interface Specification (SIS) - Description of the instrument and data structures

    Raw Data The files will contain both images and tables. Many fields are direct unconverted copies of telemetry produced by the instrument. The units for such fields, data numbers (DN), may represent ADC counts, encoder steps, discrete time intervals, and so on. See the SIS section 6.1.1.Table 18: Raw data file structure.

    Calibrated Data - The data files are similar in structure to the raw products but they are expressed as spectral radiance in units of kilorayleighs/nm. Estimates of uncertainty are included. See the SIS section 6.1.2 Table 19: Calibrated data file structure.

    Processed Data
    Processed data are stored as FITS files with detached XML labels and are calibrated data that have been reduced by isolating emission features and implementing spacial binning to facilitate processing. See the SIS section 6.1.3 Table 23: Occultation processed data file structure.

    Derived Data
    IUVS derived data files vary among observation modes. They are stored as FITS files with detached XML labels and contain derived densities and column abundances at the native geometry of the observation and/or on a regular grid in altitude or latitude and longitude, as appropriate. See the SIS section 6.1.4 Table 29: Occultation derived data file structure.

    Retrieving Data
    The MAVEN/IUVS data are in FITS format with detached XML labels (Need to acquire a FITS reader?)

    Selected data can be retrieved in 2 ways
    1) Downloading an index, selecting components and uploading your selection.
    Indices that tabulate information associated with each product are available. The associated geometry is for the subspacecraft point and for the time of the midpoint of the observation.
    a. Select your index
    b. Sort and make your selection
    c. Upload the URN values from your revised index (note the total uncompressed file size before requesting)

    2) Selecting specific parameters and requesting limited data files

    Downloading annual collections of data
    2014-2020 calibrated (46.8 GB)          2014-2020 processed (1.0 GB)          2014-2020 derived (147 MB)

    Raw Data is included in the complete collection.

    Citing Data Sets for Publications

    Use of calibrated data
    Schneider, N. et al., MAVEN IUVS Calibrated-level Data Product Bundle,
    urn:nasa:pds:maven.iuvs.calibrated, 2015.

    Use of processed data
    Schneider, N. et al., MAVEN IUVS Processed-level Data Product Bundle,
    urn:nasa:pds:maven.iuvs.processed 2015.

    Use of derived data
    Schneider, N. et al., MAVEN IUVS Derived-level Data Product Bundle,
    urn:nasa:pds:maven.iuvs.processed 2015.