Clarviate Analytics, the new company name for the part of Thomson Reuters that makes the Journal Citation Reports, just released the 2016 Journal Impact Factors. As expected, they separated the sections of JGR into different journals, giving each one its own JIF. And the value for JGR Space Physics is … wait for it … 2.7.
As I wrote back in January his is what I was expecting. Actually a little higher, which is nice. While this is a big drop from last year’s “all sections of JGR” value of 3.3. The JGR Space Physics JIF score is the lowest of the JGR family, just below JGR Oceans (at 2.9) and a full point below JGR Planets (at 3.7).
I am not that concerned about it. I gave several reasons for this back in January, especially the fact that we have a near linear growth in the average citations per paper for the first decade after publication. That is, the average citations per 10-year-old paper is right at 30. On average, we cite each paper ~3 times per year, every year, for a long time after publication. Here’s the graph I showed in January supporting this:
This is not the only good news about the longevity of JGR Space Physics papers: the cited half life is over 10 years (the maximum that Clarviate Analytics posts, “>10.0”). So, on average, a 10-year-old paper has yet to reach half of its total citations over its lifetime. This means that the average JGR Space Physics paper will eventually reach a total citation count of over 60.
Another bright spot: our Immediacy Index is 0.71, which is second among the JGR family. This is the number of citations in the year 2016 to papers published in the year 2016. For reference, a quick scan over the last 5 years of values reveals that only one AGU journal, Reviews of Geophysics, has an Immediacy Index over one (it jumps between 1 and 3, with its 2016 value being 2.3). I have not analyzed whether this is from a few papers getting many citations or a broad spectrum of papers getting a few, but either way, I’d say that we’re doing pretty well at reading the new literature. Way to go!
Our field of space physics has a particular way of citing publications. Some papers get immediate attention resulting in citations within the first year but most papers take a while to be absorbed by the community and achieve their full impact on the field. In the long run, JGR Space Physics papers are highly cited.