HEASARC Usage Statistics

The HEASARC periodically makes its usage statistics available for the HEASARC Users Group and other interested parties.

  1. Archive size and data downloads over time

  2. Growth of the HEASARC Archive

  3. Demand for HEASARC Web services

  4. Citations of selected HEASARC missions

  5. Data requests by quarter

  6. Data transferred by TB and by equivalent numbers of datasets, broken down by mission, for selected years

  7. History of Data Transfers by Mission

  8. Detailed HEASARC Usage Statistics (Internal Access only)

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

Archive Size and Data Downloads over Time

Figure 1. Graph shows an increase in both, with data downloads 
increasing faster than the size of the archive Figure 1: HEASARC high-energy archive size & annual data download volume plotted over time: note that the y-axis scale is logarithmic.

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Growth of the Archive

Figure 2
Figure 2: Past 25 years growth of the size of the HEASARC high-energy astrophysics data archive.

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Demand for HEASARC Web Services

Figure 3
Figure 3: Demand for HEASARC Web Services: Annual numbers of SkyView images requested, Browse queries submitted, volume of high-energy science web pages downloaded, and volume of high-energy science data downloaded.

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Citations of Selected HEASARC Missions

Citations for Selected Missions graph Figure 4: Number of citations of selected HEASARC missions over time.

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High-energy astrophysics data and web pages downloaded from the HEASARC

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

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Transfer rates

Figure 6a
Figure 6(a): The amount of high-energy data downloaded in 2013, broken down by mission.

Figure 6b
Figure 6(b): The number of (equivalent) high-energy datasets downloaded in 2013, broken down by mission.

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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.

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Data Holdings

figure 7
Figure 7: HEASARC high-energy & CMB data holdings as of April 2014, broken down by mission. These totalled 62 TB.

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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.

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Last modified: Friday, 24-Mar-2017 13:24:22 EDT