Due to the lapse in federal government funding, NASA is not updating this website. We sincerely regret this inconvenience.
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.
