skip to content
 
High Energy Astrophysics Science Archive Research Center

Guest Observer Facilities
& Science Centers

NASA Archives

HEASARC Tip:

View all tips

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


Last Update: 2007 May 24

As of the start of 2007, there were about 12 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 (4.2 TB), INTEGRAL (3.0 TB), Suzaku (0.9 TB) and XMM-Newton (1.2) archives. Other HEASARC missions which are currently active include Chandra (0.8 TB) and RXTE (1.6 TB).

We expect that the HEASARC archive volume will double to 24 TB by mid-2010 due to the further growth of these mission archives, as well as the start of the archive of the shortly to be launched (late 2007 or early 2008) GLAST mission. 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.

    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


Web page author and maintainer: Stephen A. Drake


HEASARC Home | Observatories | Archive | Calibration | Software | Tools | Students/Teachers/Public

Last modified: Thursday, 24-May-2007 16:11:09 EDT