European Space Agency, (Special Publication) ESA SP

SJR

The SJR is a size-independent prestige indicator that ranks journals by their 'average prestige per article'. It is based on the idea that 'all citations are not created equal'. SJR is a measure of scientific influence of journals that accounts for both the number of citations received by a journal and the importance or prestige of the journals where such citations come from It measures the scientific influence of the average article in a journal, it expresses how central to the global scientific discussion an average article of the journal is.

Year	SJR
1999	0.168
2000	0.192
2001	0.116
2002	0.116
2003	0.124
2004	0.145
2005	0.146
2006	0.129
2007	0.128
2008	0.138
2009	0.122
2010	0.126
2011	0.109
2012	0.113
2013	0.124
2014	0.142
2015	0.108
2016	0.109
2017	0.125
2018	0.127
2019	0.146

Total Documents

Evolution of the number of published documents. All types of documents are considered, including citable and non citable documents.

Year	Documents
1999	0
2000	666
2001	1350
2002	1812
2003	1470
2004	2208
2005	2536
2006	2887
2007	1146
2008	844
2009	635
2010	300
2011	104
2012	380
2013	399
2014	68
2015	187
2016	498
2017	0
2018	0
2019	0

Citations per document

This indicator counts the number of citations received by documents from a journal and divides them by the total number of documents published in that journal. The chart shows the evolution of the average number of times documents published in a journal in the past two, three and four years have been cited in the current year. The two years line is equivalent to journal impact factor ™ (Thomson Reuters) metric.

Cites per document	Year	Value
Cites / Doc. (4 years)	1999	0.184
Cites / Doc. (4 years)	2000	0.171
Cites / Doc. (4 years)	2001	0.097
Cites / Doc. (4 years)	2002	0.085
Cites / Doc. (4 years)	2003	0.146
Cites / Doc. (4 years)	2004	0.152
Cites / Doc. (4 years)	2005	0.166
Cites / Doc. (4 years)	2006	0.125
Cites / Doc. (4 years)	2007	0.111
Cites / Doc. (4 years)	2008	0.091
Cites / Doc. (4 years)	2009	0.095
Cites / Doc. (4 years)	2010	0.085
Cites / Doc. (4 years)	2011	0.070
Cites / Doc. (4 years)	2012	0.069
Cites / Doc. (4 years)	2013	0.080
Cites / Doc. (4 years)	2014	0.042
Cites / Doc. (4 years)	2015	0.063
Cites / Doc. (4 years)	2016	0.054
Cites / Doc. (4 years)	2017	0.080
Cites / Doc. (4 years)	2018	0.135
Cites / Doc. (4 years)	2019	0.152
Cites / Doc. (3 years)	1999	0.184
Cites / Doc. (3 years)	2000	0.174
Cites / Doc. (3 years)	2001	0.058
Cites / Doc. (3 years)	2002	0.083
Cites / Doc. (3 years)	2003	0.146
Cites / Doc. (3 years)	2004	0.166
Cites / Doc. (3 years)	2005	0.160
Cites / Doc. (3 years)	2006	0.136
Cites / Doc. (3 years)	2007	0.112
Cites / Doc. (3 years)	2008	0.088
Cites / Doc. (3 years)	2009	0.093
Cites / Doc. (3 years)	2010	0.073
Cites / Doc. (3 years)	2011	0.054
Cites / Doc. (3 years)	2012	0.095
Cites / Doc. (3 years)	2013	0.059
Cites / Doc. (3 years)	2014	0.053
Cites / Doc. (3 years)	2015	0.047
Cites / Doc. (3 years)	2016	0.061
Cites / Doc. (3 years)	2017	0.085
Cites / Doc. (3 years)	2018	0.142
Cites / Doc. (3 years)	2019	0.185
Cites / Doc. (2 years)	1999	0.199
Cites / Doc. (2 years)	2000	0.094
Cites / Doc. (2 years)	2001	0.045
Cites / Doc. (2 years)	2002	0.083
Cites / Doc. (2 years)	2003	0.164
Cites / Doc. (2 years)	2004	0.146
Cites / Doc. (2 years)	2005	0.153
Cites / Doc. (2 years)	2006	0.126
Cites / Doc. (2 years)	2007	0.114
Cites / Doc. (2 years)	2008	0.083
Cites / Doc. (2 years)	2009	0.083
Cites / Doc. (2 years)	2010	0.055
Cites / Doc. (2 years)	2011	0.079
Cites / Doc. (2 years)	2012	0.030
Cites / Doc. (2 years)	2013	0.079
Cites / Doc. (2 years)	2014	0.033
Cites / Doc. (2 years)	2015	0.058
Cites / Doc. (2 years)	2016	0.075
Cites / Doc. (2 years)	2017	0.089
Cites / Doc. (2 years)	2018	0.157
Cites / Doc. (2 years)	2019	0.000

Total Cites

Self-Cites

Evolution of the total number of citations and journal's self-citations received by a journal's published documents during the three previous years.
Journal Self-citation is defined as the number of citation from a journal citing article to articles published by the same journal.

Cites	Year	Value
Self Cites	1999	0
Self Cites	2000	56
Self Cites	2001	1
Self Cites	2002	45
Self Cites	2003	138
Self Cites	2004	96
Self Cites	2005	118
Self Cites	2006	132
Self Cites	2007	81
Self Cites	2008	60
Self Cites	2009	20
Self Cites	2010	17
Self Cites	2011	0
Self Cites	2012	3
Self Cites	2013	10
Self Cites	2014	4
Self Cites	2015	1
Self Cites	2016	5
Self Cites	2017	0
Self Cites	2018	0
Self Cites	2019	0
Total Cites	1999	516
Total Cites	2000	367
Total Cites	2001	59
Total Cites	2002	168
Total Cites	2003	559
Total Cites	2004	770
Total Cites	2005	876
Total Cites	2006	843
Total Cites	2007	858
Total Cites	2008	575
Total Cites	2009	452
Total Cites	2010	191
Total Cites	2011	96
Total Cites	2012	99
Total Cites	2013	46
Total Cites	2014	47
Total Cites	2015	40
Total Cites	2016	40
Total Cites	2017	64
Total Cites	2018	97
Total Cites	2019	92

External Cites per Doc

Cites per Doc

Evolution of the number of total citation per document and external citation per document (i.e. journal self-citations removed) received by a journal's published documents during the three previous years. External citations are calculated by subtracting the number of self-citations from the total number of citations received by the journal’s documents.

Cites	Year	Value
External Cites per document	1999	0.184
External Cites per document	2000	0.147
External Cites per document	2001	0.057
External Cites per document	2002	0.061
External Cites per document	2003	0.110
External Cites per document	2004	0.146
External Cites per document	2005	0.138
External Cites per document	2006	0.114
External Cites per document	2007	0.102
External Cites per document	2008	0.078
External Cites per document	2009	0.089
External Cites per document	2010	0.066
External Cites per document	2011	0.054
External Cites per document	2012	0.092
External Cites per document	2013	0.046
External Cites per document	2014	0.049
External Cites per document	2015	0.046
External Cites per document	2016	0.054
External Cites per document	2017	0.085
External Cites per document	2018	0.142
External Cites per document	2019	0.185
Cites per document	1999	0.184
Cites per document	2000	0.174
Cites per document	2001	0.058
Cites per document	2002	0.083
Cites per document	2003	0.146
Cites per document	2004	0.166
Cites per document	2005	0.160
Cites per document	2006	0.136
Cites per document	2007	0.112
Cites per document	2008	0.088
Cites per document	2009	0.093
Cites per document	2010	0.073
Cites per document	2011	0.054
Cites per document	2012	0.095
Cites per document	2013	0.059
Cites per document	2014	0.053
Cites per document	2015	0.047
Cites per document	2016	0.061
Cites per document	2017	0.085
Cites per document	2018	0.142
Cites per document	2019	0.185

% International Collaboration

International Collaboration accounts for the articles that have been produced by researchers from several countries. The chart shows the ratio of a journal's documents signed by researchers from more than one country; that is including more than one country address.

Year	International Collaboration
1999	0
2000	19.52
2001	1.85
2002	19.48
2003	31.70
2004	33.20
2005	31.98
2006	34.19
2007	33.16
2008	31.28
2009	28.03
2010	31.67
2011	21.15
2012	35.00
2013	27.32
2014	48.53
2015	32.62
2016	41.37
2017	0
2018	0
2019	0

Citable documents

Non-citable documents

Not every article in a journal is considered primary research and therefore "citable", this chart shows the ratio of a journal's articles including substantial research (research articles, conference papers and reviews) in three year windows vs. those documents other than research articles, reviews and conference papers.

Documents	Year	Value
Non-citable documents	1999	4
Non-citable documents	2000	4
Non-citable documents	2001	12
Non-citable documents	2002	21
Non-citable documents	2003	48
Non-citable documents	2004	65
Non-citable documents	2005	86
Non-citable documents	2006	101
Non-citable documents	2007	123
Non-citable documents	2008	107
Non-citable documents	2009	84
Non-citable documents	2010	50
Non-citable documents	2011	37
Non-citable documents	2012	20
Non-citable documents	2013	16
Non-citable documents	2014	31
Non-citable documents	2015	33
Non-citable documents	2016	28
Non-citable documents	2017	15
Non-citable documents	2018	11
Non-citable documents	2019	7
Citable documents	1999	2798
Citable documents	2000	2106
Citable documents	2001	1014
Citable documents	2002	1995
Citable documents	2003	3780
Citable documents	2004	4567
Citable documents	2005	5404
Citable documents	2006	6113
Citable documents	2007	7508
Citable documents	2008	6462
Citable documents	2009	4793
Citable documents	2010	2575
Citable documents	2011	1742
Citable documents	2012	1019
Citable documents	2013	768
Citable documents	2014	852
Citable documents	2015	814
Citable documents	2016	626
Citable documents	2017	738
Citable documents	2018	674
Citable documents	2019	491

Cited documents

Uncited documents

Ratio of a journal's items, grouped in three years windows, that have been cited at least once vs. those not cited during the following year.

Documents	Year	Value
Uncited documents	1999	2446
Uncited documents	2000	1850
Uncited documents	2001	979
Uncited documents	2002	1883
Uncited documents	2003	3403
Uncited documents	2004	4080
Uncited documents	2005	4860
Uncited documents	2006	5610
Uncited documents	2007	7019
Uncited documents	2008	6125
Uncited documents	2009	4550
Uncited documents	2010	2471
Uncited documents	2011	1695
Uncited documents	2012	964
Uncited documents	2013	753
Uncited documents	2014	847
Uncited documents	2015	814
Uncited documents	2016	620
Uncited documents	2017	708
Uncited documents	2018	618
Uncited documents	2019	449
Cited documents	1999	356
Cited documents	2000	260
Cited documents	2001	47
Cited documents	2002	133
Cited documents	2003	425
Cited documents	2004	552
Cited documents	2005	630
Cited documents	2006	604
Cited documents	2007	612
Cited documents	2008	444
Cited documents	2009	327
Cited documents	2010	154
Cited documents	2011	84
Cited documents	2012	75
Cited documents	2013	31
Cited documents	2014	36
Cited documents	2015	33
Cited documents	2016	34
Cited documents	2017	45
Cited documents	2018	67
Cited documents	2019	49