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How Much X-Ray and Gamma-ray Data Are in the HEASARC's Archive?


Last Update: 2009 Oct 21

As of the Summer 2009, there were about 24 Terabytes (TB = 1 billion kB) of X-ray and gamma-ray data in the HEASARC's archive, compared to 1.8 TB at the start of 2000 and 0.3 TB at the start of 1995. Recent growth has been mostly due to the increasing size of the Swift (now 8.4 TB), INTEGRAL (now 5.6 TB), Suzaku (now 2.6 TB) and XMM-Newton (now 2.3 TB) archives. Other HEASARC missions which are currently being archived include Fermi (now 0.3 TB), Chandra (now 1.0 TB) and RXTE (now 1.9 TB).

For more detailed statistics, including a breakdown of the data holdings by mission, check out the HEASARC Usage Statistics webpage.

Figure 1
Figure 1: Past and Projected Future Growth of the HEASARC Science Data Archive and Annual Volume Downloaded by Users.

    Start       Archive Size        Archive Growth Rate    No of Active
   of Year          TB                     TB              HEASARC Missions

     1993          0.001                  0.001                 4
     1994          0.014                  0.013                 4
     1995          0.30                   0.29                  5
     1996          0.45                   0.15                  6
     1997          0.55                   0.10                  6
     1998          0.96                   0.41                  6
     1999          1.37                   0.41                  7
     2000          1.84                   0.47                  5
     2001          2.13                   0.29                  5
     2002          2.52                   0.39                  5
     2003          2.85                   0.33                  5
     2004          3.12                   0.27                  6
     2005          4.84                   1.72                  7
     2006          8.27                   3.43                  7
     2007         11.90                   3.63                  6
     2008         17.09                   5.19                  6 -> 7
     2009         19.88                   2.79                  7


Web page author and maintainer: Stephen A. Drake


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Last modified: Wednesday, 21-Oct-2009 14:56:04 EDT