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


Last Update: 2017 February 14

As of this date, there were about 85 Terabytes (TB = 1 billion kB) of X-ray and gamma-ray data in the HEASARC's high-energy archive, compared to 38 TB in April 2012, 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 24.6 TB), Fermi (now 16.0 TB), INTEGRAL (now 13.7 TB), and XMM-Newton (now 8.5 TB). Other HEASARC missions which are currently being archived include Chandra (now 2.5 TB) and NuSTAR (now 1.4 TB). Data volumes from older missions are typically much smaller, except for the recently ended Suzaku (6.5 TB), RXTE (2.7 TB) and BeppoSAX (1.3 TB) missions.

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


Figure 1: Growth of the HEASARC High-Energy Data Archive and Annual Volume Downloaded by Users.



    Start       Archive Size    Archive Growth     No. of Active High-Energy      Major
   of Year      in TB              Rate in TB           HEASARC Missions          Events

     1993          0.001                 0.001                 4       Launch of ASCA joining EUVE, ROSAT & CGRO in orbit
     1994          0.014                 0.013                 4
     1995          0.30                   0.29                 5       Launch of RXTE

     1996          0.45                   0.15                 6       Launch of BeppoSAX
     1997          0.55                   0.10                 6
     1998          0.96                   0.41                 6
     1999          1.37                   0.41                 7       Launch of Chandra & XMM; End of ROSAT
     2000          1.84                   0.47                 5       End of CGRO & ASCA

     2001          2.13                   0.29                 5       Launch of HETE2; End of EUVE
     2002          2.52                   0.39                 5       Launch of Integral; End of BeppoSAX
     2003          2.85                   0.33                 5 
     2004          3.12                   0.27                 6       Launch of Swift
     2005          4.84                   1.72                 7       Launch of Suzaku

     2006          8.27                   3.43                 7 
     2007         11.90                   3.63                 6       End of HETE2
     2008         17.09                   5.19                 7       Launch of Fermi
     2009         19.88                   2.79                 7
     2010         25.79                   5.91                 7

     2011         30.66                   4.87                 7
     2012         37.90                   7.24                 7       End of RXTE; Launch of NuSTAR
     2013         43.52                   5.62                 7
     2014         53.52                  10.00                 7
     2015         65.43                  11.91                 7       End of Suzaku

     2016         74.90                   9.47                 7       Launch & End of Hitomi
     2017         84.60                   9.70                 7       Launch of NICER


Web page author and maintainer: Stephen A. Drake


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Last modified: Tuesday, 03-Oct-2017 13:32:33 EDT