Bundle Description for the MAVEN NGIMS Archive Bundle =================================================== Overview ======== The MAVEN NGIMS archive bundle includes all data taken by the Neutral Gas and Ion Mass Spectrometer (NGIMS) instrument aboard the Mars Atmosphere and Volatile Evolution (MAVEN) spacecraft. The MAVEN mission and spacecraft are described in the MAVEN mission and spacecraft description documents, available in the MAVEN archive bundle. These data are generated by ionizing the neutral gas and then selectively filtering and detecting the resulting ions according to their mass-to-charge ratio. The NGIMS instrument is described in the MAVEN NGIMS Software Interface Specification (SIS) which is available in the document collection. Data Collections =============== The data is included in two different processing levels, raw and calibrated. Raw data are the original data from the instrument. Calibrated data are raw data converted to engineering units and corrected for detector response. Derived data are processed abundances and higher level products. The calibration process is also described in the NGIMS SIS document. Flight data are available in both raw and calibrated form in the data_raw and the data_calibrated collections. Data acquired during instrument integration, calibration and testing is made available in the calibration collection in a raw form. Derived and resampled atmospheric abundances and scale heights are high level products that are available in the data_derived and data_resampled collections The following table describes the NGIMS products in the calibration, data_raw, and data_calibrated collections: Data Definitions Table ---------------------------------------------------------------------------- Product Name Description File Label ------------ ----------- ---------- Calibration Housekeeping Raw housekeeping packets gnd_hk Calibration Science Raw science packets gnd_sci Calibration Message Log Raw message log gnd_msg Calibration Markers Raw marker file gnd_mkr Raw Housekeeping Raw housekeeping packets raw_hk Raw Science Raw science packets raw_sci Raw Message Log Raw message log raw_msg Raw Markers Raw marker file raw_mkr Calibrated Housekeeping Calibrated housekeeping packets cal_hk Calibrated Science Calibrated science packets osion/osnb Calibrated Message Log Calibrated message log cal_msg Calibrated Markers Calibrated markers lists cal_mkr Derived Densities Neutral and Ion abundances ion, cso, csn Resampled Abundances Altitude resampled abundances res_den Resampled Scale Heights Scale-heights and temperatures res_sht ---------------------------------------------------------------------------- Document Collection =================== The document collection contains the following documents. It also contains an inventory of its contents. Document Description -------- ----------- NGIMS SIS The Software Interface Specification, including a full description of the data formats and contents, and a brief description of the NGIMS instrument. This document provides detailed of the instrument calibration results necessary to process the NGIMS data. Context Collection ================== The context collection contains pointers to the context information including mission, spacecraft, instrument, and bundle descriptions. XML_schema Collection ================= The schema collection contains pointers to all schemas used to generate the MAVEN NGIMS bundle.