Highlights of the Project Data Management Plan for the Submillimeter-Wave Astronomy Satellite
This is a summary of a preliminary version of the Project Data Management Plan (PDMP) for SWAS, and subject to slight revision. The PDMP itself will be available on request from the Configuration Management Office of NASA's Small Explorer (SMEX) program (NASA/GSFC, Code 740.0, Greenbelt, MD 20771).
SWAS is a NASA-funded mission with the Smithsonian Astrophysical Observatory as the Principal Investigator institution. Co-Investigator institutions are the University of Cologne, University of Massachusetts, NASA Ames Research Center, National Air and Space Museum, Cornell University, and Johns Hopkins University.
SWAS has one instrument, a two-channel Schottky-barrier diode submillimeter receiver. It has an acousto-optical spectrometer (AOS) with 1450 channels of 1 MHz bandwidth and two continuum detectors, each of 700 MHz bandwidth. SWAS will observe lines of O_2 (487 GHz), C (492 GHz), 13CO (551 GHz), and H_2O (557 GHz) toward dense interstellar clouds in our Galaxy.
SWAS has a only a few observing modes:
Data Rate and Volume
Data from SWAS will be downlinked to GSFC once or twice per day and will be transferred to SAO via a dedicated digital data link. The lowest level data processing will be performed at SAO; higher-level processing will be shared among the PI and Co-I institutions. About 20 Gbytes of raw data are expected for each 6 months of operation. The corresponding volume of reduced data, largely spectra and maps (see below), is expected to be 200 Mbytes.
The data products will fall into three categories: Raw, Level 1, and Level 2.
Data Release Schedule
SWAS will not have a guest investigator program. SWAS data products and documentation will be made publicly available beginning 18 months after launch, when the raw and Level 1 data from the first 6 months of operation are released. Subsequent releases will be made at 6-month intervals, 12-18 months behind the observations. Level 2 data products will be released six months after SWAS ceases operations, or three years after launch, whichever comes first.