HEASARC Usage Statistics
The HEASARC periodically makes its usage statistics available for the HEASARC Users Group and other interested parties.Archive Size and Data Downloads over Time
Figure 1: HEASARC high-energy archive size & annual data download volume plotted over time: note that the
y-axis scale is logarithmic.
Growth of the Archive
Figure 2: Past 30 years growth of the size of the HEASARC high-energy astrophysics data archive.
Demand for HEASARC Web Services
Figure 3: Demand for HEASARC Web Services: Annual numbers of SkyView images requested, SciServer users, Browse
queries submitted, volume of high-energy science web pages downloaded, and volume of high-energy science data
downloaded.
Citations of Selected HEASARC Missions
Figure 4: Number of citations of selected HEASARC missions over time.
High-energy astrophysics data and web pages downloaded from the HEASARC
Figure 5: FTP and HTTP requested volume of data and web pages (TB per quarter).
High-energy astrophysics data and web pages downloaded from the HEASARC
Figure 6a: The amount of high-energy data downloaded in 2024, broken down by mission.
Transfer Rates
Figure 6b: The number of (equivalent) high-energy datasets downloaded in 2024, broken down by mission.
Figure 6b: The number of (equivalent) high-energy datasets downloaded in 2024, broken down by mission.
- The 44 Terabytes of HEASARC data transferred in 2009 broken down by mission/directory.
- The number of datasets (100,131) transferred in 2009 broken down by mission/directory.
- 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
Data Holdings
Figure 7: HEASARC high-energy & CMB data holdings as of Jan 2024, broken down by mission.
These totalled ~264.5 TB.
- 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.
