Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies
if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the
same subfield and year (this is the minimum needed to enter the top 1%, not the average
within it), or reaches the top citation threshold in at least one of its specific research
topics.
Revisiting the Sunspot Number
2014439 citationsF. Clette, Leif Svalgaard et al.profile →
Countries citing papers authored by Leif Svalgaard
Since
Specialization
Citations
This map shows the geographic impact of Leif Svalgaard's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Leif Svalgaard with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Leif Svalgaard more than expected).
This network shows the impact of papers produced by Leif Svalgaard. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Leif Svalgaard. The network helps show where Leif Svalgaard may publish in the future.
Co-authorship network of co-authors of Leif Svalgaard
This figure shows the co-authorship network connecting the top 25 collaborators of Leif Svalgaard.
A scholar is included among the top collaborators of Leif Svalgaard based on the total number of
citations received by their joint publications. Widths of edges
represent the number of papers authors have co-authored together.
Node borders
signify the number of papers an author published with Leif Svalgaard. Leif Svalgaard is excluded from
the visualization to improve readability, since they are connected to all nodes in the network.
Svalgaard, Leif. (2019). Re-analysis of the Wolfer Group Number Backbone. AGUFM. 2019.1 indexed citations
3.
Cliver, E. W., F. Clette, Leif Svalgaard, & J. M. Vaquero. (2015). Recalibrating the Sunspot Number (SN): The 3 rd and 4 th SN Workshops. 39. 1–19.13 indexed citations
4.
Clette, F., Leif Svalgaard, E. W. Cliver, J. M. Vaquero, & Laure Lefèvre. (2015). The new Sunspot and Group Numbers: a full recalibration. 29. 2249591.3 indexed citations
5.
Penn, Matthew J., W. Livingston, & Leif Svalgaard. (2012). Decreasing Sunspot Magnetic Fields Explain Unique 10.7cm Radio Flux. 220.1 indexed citations
6.
Svalgaard, Leif & Kenneth H. Schatten. (2008). Predicting Solar Cycle 24. AGU Fall Meeting Abstracts. 2008.1 indexed citations
7.
Cliver, E. W. & Leif Svalgaard. (2007). Origins of the Wolf Sunspot Number Series: Geomagnetic Underpinning. AGU Fall Meeting Abstracts. 2007.3 indexed citations
8.
Svalgaard, Leif & E. W. Cliver. (2007). Calibrating the Sunspot Number Using "the Magnetic Needle". AGU Spring Meeting Abstracts. 2007.9 indexed citations
9.
Svalgaard, Leif. (2005). Rederivation of Dst Index. AGU Fall Meeting Abstracts. 2005.1 indexed citations
10.
Svalgaard, Leif, et al.. (2004). Semiannual Variation of Geomagnetic Activity: Protons or Photons?. AGUFM. 2004.1 indexed citations
11.
Svalgaard, Leif & E. W. Cliver. (2003). New Geomagnetic Index (idv) Measuring Magnitude of Interplanetary Magnetic Field. AGU Fall Meeting Abstracts. 2003.1 indexed citations
12.
Svalgaard, Leif. (2002). The Semi-annual Variation of Geomagnetic Activity.. AGU Fall Meeting Abstracts. 2002.18 indexed citations
13.
Schatten, Kenneth H., P. H. Scherrer, Leif Svalgaard, & John M. Wilcox. (1978). A physical mechanism for the prediction of the sunspot number during solar cycle 21. Defense Technical Information Center (DTIC). 78. 29028.1 indexed citations
14.
Duvall, T. L., John M. Wilcox, Leif Svalgaard, P. H. Scherrer, & P. S. McIntosh. (1977). Comparison of H alpha synoptic charts with the large-scale solar magnetic field as observed at Stanford. NASA STI/Recon Technical Report N. 77. 29049.1 indexed citations
15.
Svalgaard, Leif. (1976). Interplanetary sector structure 1947 - 1975. NASA STI Repository (National Aeronautics and Space Administration). 77. 11948.33 indexed citations
16.
Svalgaard, Leif & John M. Wilcox. (1976). Three-dimensional structure of the extended solar magnetic field and the sunspot cycle variation in cosmic ray intensity. STIN. 77. 11956.1 indexed citations
17.
Svalgaard, Leif. (1975). Recalibration of Bartels geomagnetic activity indices Kp and ap to include universal time variations. Defense Technical Information Center (DTIC).4 indexed citations
18.
Svalgaard, Leif. (1974). On the use of Godhavn H-component as an indicator of the interplanetary sector polarity. NASA STI Repository (National Aeronautics and Space Administration). 75. 12867.1 indexed citations
19.
Svalgaard, Leif. (1973). Solar Magnetic Field at Sunspot Minima. Bulletin of the American Astronomical Society. 5. 280.1 indexed citations
20.
Svalgaard, Leif. (1972). Interplanetary Sector Structure during 4 Solar Cycles. Bulletin of the American Astronomical Society. 4. 393.5 indexed citations
Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive
bibliographic database. While OpenAlex provides broad and valuable coverage of the global
research landscape, it—like all bibliographic datasets—has inherent limitations. These include
incomplete records, variations in author disambiguation, differences in journal indexing, and
delays in data updates. As a result, some metrics and network relationships displayed in
Rankless may not fully capture the entirety of a scholar's output or impact.