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: 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
| 
