IUVS is an Imaging UltraViolet Spectrograph Spanning 110-340 nm with two spectral resolution modes with low resolution (180-340 nm, λ/Δλ~400) and high resolution (110-190 nm, λ/Δλ=13,800) to measure the D/H ratio. The instrument operates in 5 modes; stellar occultation, echelle, limb, scan, disk mapping, and corona observations.
IUVS measures vertical profiles of neutrals and ions through limb emissions and provides information on the lower atmospheric properties from stellar occultations. In addition, it provides full disk maps obtained near apoapsis as well as D/H ratios and hot coronal mapping. To contribute to the mission goals, IUVS makes 3 types of measurements:
Useful Mission Documents
- Profiles and column abundances of H, C, N, O, CO, N2, and CO2 from the homopause up to two scale heights (~1500 km for coronal H and O, ~24 km for CO2) above the exobase with a vertical resolution of one scale height for each species and 25% accuracy.
- Profiles and column abundances of C+ and CO2+, from the ionospheric main peak up to the nominal ionopause with one O2+ scale height vertical resolution and 25% accuracy.
- D/H ratio above the homopause with sufficient accuracy (~30%) to capture spatial/temporal variations (factor of 2) and compare with measured D/H in bulk atmosphere.
Archive Bundle Contents
) This table is constructed from parameters derived from the MAVEN SPK file and the MAVEN events file. It contains information concerning mission activity that might affect the quality of the data as well as geometry at periapse.
Software Interface Specification (SIS)
- Description of the instrument and data structures
IUVS operates in multiple modes: limb scans, echelle mode, disk scans, coronal scans, and stellar occultations. Each readout of the detector returns data in data numbers (DN) versus wavelength and position along the aperture. The binning of the detector readouts in the spatial and spectral domains varies with operational mode. Processed and derived data products convert the DN to spectral radiance in kilorayleigh/nanometer (kr/nm) and local and volumetric densities for relevant species.
The data are separated by mode and reduction level.
Raw = DN/bin + engineering and geometric data
Calibrated = Calibrated instrument readouts in kr/nm and ancillary data
Processed = calibrated brightness including isolating emission features and spatial binning
Derived = column abundance, density profiles, and maps ( none yet archived)
See section 4.1 of the SIS for processing details.
- Directory containing the document collection, which includes references to refereed journals using this instrument, and information about calibration and explanation of data structures.
- Summary of important observed emission features and derived quantities from the nominal modes of operation (limb scans, coronal scans, echelle mode scans, disk imaging, and stellar occultations). These key parameters are condensed from more detailed high order data products.
All data are stored in Flexible Image Transport System (FITS) format with a detached PDS4 XML label (Need to acquire a FITS reader
?). Data are organized by mission phase and separated into modes ( Corona, Disk, Echelle, Limb or Stellar Occultation), based on differences in processing techniques. Each mode contains Raw, Calibrated, Processed, and Derived data products. See the Software Interface Specification (SIS
) Section 6.1 for details.
Calibration Information and Files
Comet C/2013 A1(Siding Spring)
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,
Other Useful Products for Interpreting the Data
- A listing of team members to facilitate literature searches
- Archived MAVEN SPICE ancillary data providing observational geometry (positions, orientations, instrument pointing, time conversions, etc.) are available from the PDS NAIF Node.