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
) for details of specific campaigns).
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
- 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 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.
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.
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
(46.8 GB) 2014-2020 processed
(1.0 GB) 2014-2020 derived
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,
Use of processed data
Schneider, N. et al., MAVEN IUVS Processed-level Data Product Bundle,
Use of derived data
Schneider, N. et al., MAVEN IUVS Derived-level Data Product Bundle,