H. Kopka

3.5k total citations
76 papers, 3.0k citations indexed

About

H. Kopka is a scholar working on Astronomy and Astrophysics, Geophysics and Aerospace Engineering. According to data from OpenAlex, H. Kopka has authored 76 papers receiving a total of 3.0k indexed citations (citations by other indexed papers that have themselves been cited), including 65 papers in Astronomy and Astrophysics, 45 papers in Geophysics and 21 papers in Aerospace Engineering. Recurrent topics in H. Kopka's work include Ionosphere and magnetosphere dynamics (63 papers), Earthquake Detection and Analysis (45 papers) and GNSS positioning and interference (18 papers). H. Kopka is often cited by papers focused on Ionosphere and magnetosphere dynamics (63 papers), Earthquake Detection and Analysis (45 papers) and GNSS positioning and interference (18 papers). H. Kopka collaborates with scholars based in Germany, New Zealand and Norway. H. Kopka's co-authors include P. Stubbe, B. Thidé, M. T. Rietveld, H. Derblom, R. L. Dowden, Å. Hedberg, M. T. Rietveld, T. B. Jones, H. Kohl and T. R. Robinson and has published in prestigious journals such as Nature, Physical Review Letters and Journal of Geophysical Research Atmospheres.

In The Last Decade

H. Kopka

74 papers receiving 2.5k citations

Peers

Countries citing papers authored by H. Kopka

Since Specialization

Citations

This map shows the geographic impact of H. Kopka'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 H. Kopka with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites H. Kopka more than expected).

Fields of papers citing papers by H. Kopka

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by H. Kopka. 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 H. Kopka. The network helps show where H. Kopka may publish in the future.

Co-authorship network of co-authors of H. Kopka

This figure shows the co-authorship network connecting the top 25 collaborators of H. Kopka. A scholar is included among the top collaborators of H. Kopka 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 H. Kopka. H. Kopka is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

#	Work	Indexed citations
1	The “long wavelength radar” on the Mars-94 orbiter 1995 ·Advances in Space Research ·E. Nielsen, W. I. Axford, T. Hagfors, H. Kopka, N. A. Armand, (unknown), (unknown), Т. К. Бреус	8
2	Introduction to ionospheric heating at Tromsø—I. Experimental overview 1993 ·Journal of Atmospheric and Terrestrial Physics ·M. T. Rietveld, H. Kohl, H. Kopka, P. Stubbe	201
3	VLF, ELF and ULF research using the Tromsø heating facility 1990 ·MPG.PuRe (Max Planck Society) ·M. T. Rietveld, R. Graham Barr, P. Stubbe, (unknown), H. Kopka, R. L. Dowden	3
4	Excitation of periodic magnetic field oscillations in the ULF range by amplitude modulated HF waves 1990 ·Annales Geophysicae ·(unknown), M. T. Rietveld, P. Stubbe, H. Kopka	14
5	Pc1 ionospheric electric field oscillations 1988 ·Annales Geophysicae ·M. T. Rietveld, H. Kopka, P. Stubbe	5
6	Multiple frequency radar observations of high‐latitude E region Irregularities in the HF modified ionosphere 1987 ·Journal of Geophysical Research Atmospheres ·(unknown), F. T. Djuth, (unknown), William E. Gordon, Å. Hedberg, B. Thidé, H. Derblom, R. Bostrōm, E. Nielsen, P. Stubbe, H. Kopka	28
7	Comparison between the ionospheric plasma drift and the motion of artificially induced irregularities as observed by HF backscatter radars 1986 ·Annales Geophysicae ·(unknown), Å. Hedberg, J. Oksman, E. Nielsen, P. Stubbe, H. Kopka	12
8	First experimental evidence of HF produced electron density irregularities in the polar ionosphere; Diagnosed by UHF radio star scintillations 1984 ·Geophysical Research Letters ·A. Frey, P. Stubbe, H. Kopka	36
9	Ionospheric heater beam scanning: A new technique for ELF studies of the auroral ionosphere 1984 ·Radio Science ·M. T. Rietveld, R. Graham Barr, H. Kopka, E. Nielsen, P. Stubbe, R. L. Dowden	26
10	First observations of 140‐MHZ plasma line backscatter during heating experiments at Tromsø 1984 ·Journal of Geophysical Research Atmospheres ·Å. Hedberg, B. Thidé, R. Bostrōm, H. Derblom, H. Kopka, P. Stubbe	11
11	Effect of a heated patch of auroral ionosphere on VLF-radio wave propagation 1984 ·Nature ·R. Graham Barr, M. T. Rietveld, H. Kopka, P. Stubbe	26
12	The electron and ion spectra of radar returns from the critical height during ionospheric heating experiments 1983 ·MPG.PuRe (Max Planck Society) ·H. Kohl, C. La Hoz, K. Folkestad, T. Hansen, H. Kopka, Garrett S. Rose, P. Stubbe	3
13	First results of the in situ measurements of the HERO heating campaign 1983 ·MPG.PuRe (Max Planck Society) ·Garrett S. Rose, B. Grandal, (unknown), (unknown), K. Spenner, J. Trøim, J. A. Holtet, (unknown), H. Kopka, P. Stubbe	1
14	Observations of enhanced plasma lines by EISCAT during heating experiments 1983 ·Radio Science ·T. Hagfors, W. Kofman, H. Kopka, P. Stubbe, (unknown)	62
15	Observations of stimulated electromagnetic emissions in ionospheric heating experiments 1983 ·Radio Science ·B. Thidé, H. Derblom, Å. Hedberg, H. Kopka, P. Stubbe	79
16	Nonlinear reflectivity of high-power radio waves in the ionosphere 1982 ·Nature ·H. Kopka, P. Stubbe, T. B. Jones, T. R. Robinson	15
17	Wide band attenuation of radio waves caused by powerful HF waves: Saturation and dependence on ionospheric variability 1982 ·Journal of Geophysical Research Atmospheres ·P. Stubbe, H. Kopka, T. B. Jones, T. R. Robinson	51
18	Generation of Pc 5 pulsations by polar electrojet modulation: First experimental evidence 1981 ·Journal of Geophysical Research Atmospheres ·P. Stubbe, H. Kopka	32
19	On the ionospheric modification experiment projected at MPI Lindau: Scientific objectives 1977 ·MPG.PuRe (Max Planck Society) ·P. Stubbe, H. Kopka	2
20	Interpretation of Anomalous Oblique Incidence Sweep‐Frequency Records Using Ray Tracing 1968 ·Radio Science ·H. Kopka, (unknown)	6

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.

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