PDS: The Planetary Atmospheres Node
- Determine variation of the neutral composition with altitude, local solar time, longitude and season from the homopause to the exobase where neutral gas can escape.
- Derive stable isotope ratios and variations.
- Provide a basis for the study of thermospheric energetics, transport, circulation, and formation of the ionosphere.
- Reveal the effects of lower atmosphere meteorological effects, such as dust storms, on the composition of the upper atmosphere and exobase.
The Neutral Gas and Ion Mass Spectrometer (NGIMS) is a quadrupole mass spectrometer with open and closed sources. The open ion source mode is used to measure reactive neutral gas species and to sample ambient thermal and suprathermal ions while the closed source samples non-reactive neutrals. The mass range is 2 - 150 Da.
Measurement Objectives
NGIMS will measure the neutral composition, isotopic ratios and scale height temperature of the major gas species (He, N, O, CO, N2, NO, O2, Ar, and CO2) in the upper atmosphere. It will:
Useful Mission Documents (also found in Documentation)
Archive Bundle Contents
Selecting and Requesting Data - The following index can be downloaded and edited to contain data that conform to your needs. This allows you to understand the scope of the data set and to tailor your request for specific products.
Citing Data Sets for Publications (to be developed)
Other Useful Products for Interpreting the Data
Measurement Objectives
NGIMS will measure the neutral composition, isotopic ratios and scale height temperature of the major gas species (He, N, O, CO, N2, NO, O2, Ar, and CO2) in the upper atmosphere. It will:
Useful Mission Documents (also found in Documentation)
Mission Description
Spacecraft Description
Software Interface Specification (SIS)- Description of the instrument and data structures
Calibration Document - Description of calibration methods
Spacecraft Description
Software Interface Specification (SIS)- Description of the instrument and data structures
Calibration Document - Description of calibration methods
Archive Bundle Contents
Documentation - Directory containing the document collection, which includes references to refereed journals using this instrument, and information about calibration and explanation of data structures.
Raw Data - Directory containing the raw data files
Calibrated Data - Directory containing the calibrated data files
Derived Data - Directory containing advanced products
Raw Data - Directory containing the raw data files
Calibrated Data - Directory containing the calibrated data files
Derived Data - Directory containing advanced products
Selecting and Requesting Data - The following index can be downloaded and edited to contain data that conform to your needs. This allows you to understand the scope of the data set and to tailor your request for specific products.
As-flown Index - List of actual observations in order of
acquisition
Requesting Data You will need to upload your edited file
Requesting Data You will need to upload your edited file
Citing Data Sets for Publications (to be developed)
Other Useful Products for Interpreting the Data
References - Publications by team members
Other Potential Relevant Data - Data that may be relevant from missions other than MAVEN
SPICE - Archived MAVEN SPICE ancillary data providing observational geometry (positions, orientations, instrument pointing, time conversions, etc.) are available from the PDS NAIF Node.
Other Potential Relevant Data - Data that may be relevant from missions other than MAVEN
SPICE - Archived MAVEN SPICE ancillary data providing observational geometry (positions, orientations, instrument pointing, time conversions, etc.) are available from the PDS NAIF Node.
