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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: 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
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