IUVS CERTIFIED PDS4














    The Corona Mode
    The corona mode consists of data products from the different processing level collections (raw, calibrated, processed, derived) covering coronal scans of the extended Martian atmosphere during the side segments of the MAVEN orbit when IUVS has pointing priority. From orbit to orbit when IUVS has priority, it alternates between the low spectral resolution coronal scan mode and the echelle mode. The coronal scans have three distinct components: scanning while outbound above the Martian limb, inbound above the limb, and inbound below the limb (when the planet intersects instrument line-of-sight projected backward).

    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 files are similar in structure to the raw products but the data are calibrated spectral radiance in units of kilorayleighs/nm, along with estimates of uncertainty and engineering telemetry has been translated from DN to physical units. See the SIS section 6.1.2 Table 19: Calibrated data file structure.

    Processed data are calibrated data that have been reduced by isolating emission features and implementing spatial binning to facilitate processing. See the SIS section 6.1.3 Table 21: Corona processed data file structure.

    Derived data Caveats & Data files - IUVS derived data files vary among observation modes. They 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 28: Corona 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 given at 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 calibrated (870.3 MB)     2014 processed (7.9 MB)            2014 derived (7.5 MB)
    2015 calibrated (4.5 GB)          2015 processed (28.8 MB)          2015 derived (26.3 MB)
    2016 calibrated (6.1 GB)          2016 processed (13.4 MB)          2016 derived (12.3 MB)

    Raw Data is included in the complete collection.