The software algorithms for the QLP production will be built from the most robust algorithms (especially for imaging) within our software library. The QLP software will operate without human intervention by first identifying flares on the basis of rotation-averaged fluxes during solar observations. This software, as with all the HESSI software, will be documented and included as a living document with the SolarSoftWare (SSW) package available at the SDAC.
 
 

4.3.3 Orbital Files

      A daily or orbital attitude history file will be produced in the SOC. From this file and the software within the HESSI segment of SSW, it will be possible to reconstruct the orbit to within 10 km at any time during the mission. The orbital files will appear on the CDROMs distributed to and archived at UCB, SDAC, and ETH.

4.4 Data Archiving and Distribution

      Once a designated amount of VC2 and VC4 data is received at the SOC, it will be copied to CD-ROM along with associated ephemeris, catalog, and summary data. At least three copies of each CD data set will be produced with copies being distributed to SDAC and HEDC. At UCB on-line data access from the SOC will be via either a RAID or a CD-ROM jukebox system. The HESSI CD-ROM production system will be the same as that used by the FAST mission, a fully autonomous system producing multiple copies of data sets for distribution. At GSFC, all data products, including the latest analysis software and calibration data, will be converted to high-density magnetic tape and shipped to the NSSDC for archiving within 2 months of real time.

4.5 Archival Data Volume

      The estimated volume of mission data acquired over nominal 2-year lifetime is approximately 1 Tbyte based on 700 days at 1.5 Gbyte/day. The QLP are a small fraction of the volume of the Level 0 data files. Based on these estimates the total HESSI Mission data volume to be archived at the NSSDC will be approximately 1 Terabyte over the 2-year lifetime of the mission.

4.6 Archive Data Access

      The SDAC’s on-line archive will be used for rapid access to all the archived HESSI data. At the SDAC we expect to create an archive capable of holding up to 250 Gbytes for immediate on-line access either through direct Telnet, FTP, or web interface. While this is a large database capable of holding the most important events observed with HESSI, it will not hold the entire database including all of the ancillary observations, both ground and space based. Additionally, we expect the availability of a 10 Tbyte near-line (<1 minute) archive at ETH. Both of these data archives will be open for public use without reservation.
 

Acknowledgments

      The preparation of this document was greatly aided by the assistance of Kate Harps, Dave Curtis and David Smith.