Click on any figure below to see an enlarged, printable version.

Archive Size and Data Downloads over Time
	Figure 1: HEASARC archive size & annual data download amounts over time. Back to top

Growth of the Archive
	Figure 2: Past 15 years (1996-2010) growth of the size of the HEASARC science data archive. Back to top

Demand for HEASARC Web Services
	Figure 3: Demand for HEASARC Web Services: Annual numbers of SkyView images requested, Browse queries submitted, volume of science web pages downloaded, and volume of science data downloaded, from 1993-2009. Back to top

Citations of Selected HEASARC Missions
	Figure 4: Number of citations of selected HEASARC missions over time. Back to top

Science data and web pages requested
	Figure 5: FTP and HTTP requested volume of data and web pages (TB per quarter). Back to top

Transfer rates
	Figure 6(a): The amount of TB of data downloaded in 2009, broken down by mission. A grand total of 44.12 TB of HEASARC data was copied by our users in this year.
	Figure 6(b): The number of (equivalent) datasets downloaded in 2009, broken down by mission. A grand total of 100,131 HEASARC datasets was copied by our users in this year. Back to top
The 28.88 Terabytes of HEASARC data transferred in 2007 broken down by mission/directory. The number of datasets (64,351) transferred in 2007 broken down by mission/directory. The number of datasets transferred in 2005 by mission/directory. The number of datasets transferred in 2004 by mission/directory. The number of gigabytes transferred in 2003 by mission/directory (top) and datasets transferred in 2003 by mission (bottom). The number of gigabytes transferred in all of 2001 by mission/directory. The number of gigabytes transferred in all of 2000 by mission/directory. The number of gigabytes transferred in all of 1998 by mission/directory. Back to top

History of Data Transfers by Mission
	Figure 7: History of data transfers for major missions, in terms of annual data downloads (TB per year). Back to top

Data Holdings
	Figure 8: HEASARC data holdings as of May 2010, broken down by mission. These totalled 27.2 TB. Back to top
HEASARC data holdings as of October 2007, broken down by mission. These totalled 16.4 TB. HEASARC data holdings as of October 2005, broken down by mission.These totalled 7.6 TB. HEASARC data holdings as of November 2003, broken down by mission.These totalled 3.2 TB. HEASARC data holdings as of November 2001, broken down by mission. These totalled 2.4 TB. HEASARC data holdings as of December 2000, broken down by mission. These totalled 2.2 TB. HEASARC data holdings as of December 1999, broken down by mission. These totalled 1.7 TB. HEASARC data holdings as of January 1999, broken down by mission. These totalled 1.4 TB. HEASARC data holdings as of March 11, 1998, broken down by mission. These totalled 0.96 TB. Back to top