Computer Science
Scientific paper
Oct 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997acs..rept....1s&link_type=abstract
Instrument Science Report ACS-97-01, 16 pages
Computer Science
Hubble Space Telescope, Hst, Space Telescope Science Institute, Advanced Camera For Surveys, Acs
Scientific paper
We describe the expected usage of the Advanced Camera for Surveys during cycle 9 and estimate ground system requirements for the full complement of HST instruments available for cycle 9. Assuming parallel observing with all four of the cycle 9 instruments, we estimate a worst case average daily downlink of 16.5 Gbits/day (science bits excluding any overheads) if the ACS WFC images are not compressed onboard and 11.0 Gbits/day with compression of the WFC images. We foresee the potential for peak daily volumes of 22.1 Gbits/day or 13.2 Gbits/day without and with compression, respectively. We recommend that the current ground system throughput capacity be doubled to support an average daily capacity of 12 Gbits/day and a peak capacity of 18 Gbits/day following the third servicing mission. We estimate the OPUS processing requirements for the ACS pipeline to be 700 STIS CCD equivalent images/day, compared to the current 200 STIS CCD equivalent images for the cycle 7 instruments. We estimate the total archive requirements for the full complement of cycle 9 instruments to be 11.4 GBytes/day compared to the 4.5 GBytes/ day currently archived for the cycle 7 instruments.
Clampin Marc
Kutina Ray
Stiavelli Massimo
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