INTEGRAL Archives Statistics
This page shows the INTEGRAL usage of the three distinct sites holding or linking to the INTEGRAL Archives: the two official Archives, ISDA (ESAC, Madrid, Spain) and ISDC (Geneva, Switzerland), and the mirror at HEASARC (Boston, US).
16-17 December 2010 Following the IUG recommendation 30 during Meeting #10 held at ESTEC in December 2010 (see minutes here), the Archive teams set up the following page to regularly give the Scientific Community the Archive Usage Statistics of the INTEGRAL data. In particular, the IUG recommended that all the INTEGRAL archives should provide data on the archive usage as follows: - downloaded volume (external),
- number of download requests,
- and number of unique accesses (IP addresses). However, since IUG #11 held in June 2011, the second item has been skipped from the statistics (see below).
Note that these numbers are not always trivial to interpret out of their context. We recommend you to also check the ISDA results interactively at this webpage.
29 September 2011 A table such as follows will be updated hopefully once per month, if data are available. See the notes below before interpreting any numbers.
Month
| ISDC Downloaded Volume[1] (TB) - Distinct IPs[2] | ISDA Downloaded Volume (TB)
| HEASARC Downloaded Volume (TB) - Distinct IPs
| Jan. 2010 Feb. 2010 March 2010 April 2010 May 2010 June 2010 July 2010 Aug. 2010 Sept. 2010 Oct. 2010 Nov. 2010 Dec. 2010 | ?
?
?
?
?
?
?
?
?
1.78
2.2
1.07
| 1.6
0.002
0.009
0.021
0.012
0.002
0.024
0.014
0.029
0.005
0.010
0.069 | 0.232 - 15
0.290 - 9
> 0.173 - ?
? ? ? 0.098 - 4
0.003 - 23
0.051 - ?
> 0.033 - ?
0.09 - ?
0.022 - ? | Jan. 2011 Feb. 2011 March 2011 April 2011 May 2011 June 2011 July 2011 Aug. 2011 Sept. 2011 Oct. 2011 Nov. 2011 Dec. 2011
| 2.0 - 194
2.9 - 220
3.6 - 252
0.6 - 362
9.7 - 217
6.4 - 157
7.7 - 144
2.7 - 146
3.3 - 186
19.4 - 573
1.7 - 319
2.3 - 116 | 0.001
0.009
1.015
0.008 0.07
0.02
0.003 0.008 0.011
0.001
0.001
0.001
| 0.192 - ? 0.056 - ? 0.336 - ? 0.252 - ? 0.363 - TBD
0.048 - TBD
0.181 - TBD
0.176 - TBD
0.030 - TBD 0.248 - TBD
0.279 - TBD
0.003 - TBD
| Jan. 2012 Feb. 2012 March 2012 April 2012 May 2012 June 2012 July 2012 Aug. 2012 Sept. 2012 Oct. 2012 Nov. 2012 Dec. 2012
| 3.9 - 163 2.4 - 237 5.5 - 116 1.1 - 173
2.0 - 200 2.3 - 147 1.3 - 111 1.0 - 147
3.7 - 219 2.7 - 218 | 0.004 0.013 0.014 0.007 0.001 0.008 0.0008 0.031 0.0009 0.008
0.0009 0.001
| 0.004 - 517 0.043 - 589 0.033 - 559 0.003 - 537 0.196 - 524 0.302 - 618 0.007 - 631 0.154 - 671 0.380 - 551 0.046 - 585 0.116 - 639 0.195 - TBD
|
Note: [1]: External [2]: IP addresses leading to data download
(TBD: to be defined; ?: information not available)
Further comments: For the Russian RSDC Archive, no numbers are available per month, but the following estimations can be given:
- download/usage rate: ~500GB/month
- total visits: ~100/month
- unique visitors: ~20/month
ISDA does not keep track of the distinct IP (whether unique or not). ISDC had some overflow in the ftp log, therefore some data are missing for both March and April 2011 (the numbers reported above only concern the Archive Interface; HEAVENS or Archive browse numbers are not indicated). A similar problem happened for HEASARC for some months in 2010: January, February, March, July and August. The tool of HEASARC had a problem and it did not search for queries to all of the INTEGRAL web areas before 2011 (the numbers reported above do not reflect this). HEASARC numbers include both ftp and http areas; the ftp results are only for data downloads, while the http numbers are for all web accesses, including GOF web pages (hence, they are inflated). The closest thing giving individual IP addresses is "Sites".
|
