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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 (1993-2005 & projected thru 2009)
  • Growth of the HEASARC Archive (1993-2005 & projected thru 2008)
  • Demand for HEASARC Web services (1993- 2005)
  • Citations of selected HEASARC missions (1993-2004)
  • Data requests by quarter (1998-2005)
  • Data transfer rates by file set, by mission (1998-2005)
  • History of Data Transfers by Mission (1993-2005)
  • Data Holdings over time and by mission (1998-2005)
  • Detailed HEASARC Usage Statistics (Internal Access only)

    Archive Size and Data Downloads over Time

    Figure 1. Graph shows an increase in both, with data downloads increasing faster Figure 1: Archive size & data downloads over time.

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    Growth of the Archive

    Figure 2
    		 Figure 2: Past and projected future growth of the HEASARC science data archive.

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    Demand for HEASARC Web Services

    Figure 3
    		 Figure 3: Demand for HEASARC Web Services: SkyView, Browse, Science Web Pages.

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    Citations of Selected HEASARC Missions

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

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    Science data and web pages requested

    Figure 5 Figure 5: FTP and HTTP requested volume per quarter.

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    Transfer rates

    Figure 6
    		 Figure 6: The amount of data and number of datasets transferred, broken down by mission. (2005)

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    Figure 6a: The number of datasets transferred in 2004 by mission/directory.

    Figure 6b: The number of gigabytes transferred in 2003 by mission/directory (top) and datasets transferred in 2003 by mission (bottom).

    Figure 6c: The number of gigabytes transferred in all of 2001 by mission/directory.

    Figure 6d: The number of gigabytes transferred in all of 2000 by mission/directory.

    Figure 6e: The number of gigabytes transferred in all of 1998 by mission/directory.

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    History of Data Transfers by Mission

    Figure 7 Figure 7: History of data transfers by mission (in Terabytes).

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    Data Holdings

    figure 8
    		 Figure 8: HEASARC data holdings as of October 2005. This is more than 4 Terabytes more than in November 2003.

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    Figure 8a: HEASARC data holdings as of November 2003. This is nearly 800 Gbytes more than in November 2001.

    Figure 8b: HEASARC data holdings as of November 2001. This is over 200 Gbytes more than in 2000.

    Figure 8c: HEASARC data holdings as of December 2000. This is over 500 Gbytes more than in 1999.

    Figure 8d: HEASARC data holdings as of December 1999. This is nearly 300 Gbytes more than at the beginning of 1999.

    Figure 8e: HEASARC data holdings as of January 1999. This is about 500 Gbytes more than last year at this time.

    Figure 8f: HEASARC data holdings as of March 11, 1998.

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    Last modified: Monday, 19-Jun-2006 11:24:57 EDT
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