S. Ullaland

853 total citations
38 papers, 535 citations indexed

About

S. Ullaland is a scholar working on Astronomy and Astrophysics, Geophysics and Molecular Biology. According to data from OpenAlex, S. Ullaland has authored 38 papers receiving a total of 535 indexed citations (citations by other indexed papers that have themselves been cited), including 35 papers in Astronomy and Astrophysics, 20 papers in Geophysics and 12 papers in Molecular Biology. Recurrent topics in S. Ullaland's work include Ionosphere and magnetosphere dynamics (31 papers), Solar and Space Plasma Dynamics (27 papers) and Earthquake Detection and Analysis (20 papers). S. Ullaland is often cited by papers focused on Ionosphere and magnetosphere dynamics (31 papers), Solar and Space Plasma Dynamics (27 papers) and Earthquake Detection and Analysis (20 papers). S. Ullaland collaborates with scholars based in Germany, Norway and Finland. S. Ullaland's co-authors include G. Kremser, H. Trefall, B. Wilken, A. Korth, P. Tanskanen, T. Doke, J. Kangas, J. Stadsnes, K. Maezawa and Jan Magnus Bjordal and has published in prestigious journals such as Nature, Journal of Geophysical Research Atmospheres and Geophysical Research Letters.

In The Last Decade

S. Ullaland

35 papers receiving 416 citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
S. Ullaland Germany	16	531	224	192	28	24	38	535
E. R. Dyer	3	546 1.0×	174 0.8×	302 1.6×	26 0.9×	20 0.8×	4	562
R. H. Manka United States	9	495 0.9×	132 0.6×	200 1.0×	26 0.9×	9 0.4×	17	505
M. R. English United States	4	396 0.7×	105 0.5×	160 0.8×	19 0.7×	12 0.5×	4	408
K. Aarsnes Norway	13	491 0.9×	202 0.9×	153 0.8×	19 0.7×	11 0.5×	31	506
Joseph R. Kan United States	5	381 0.7×	114 0.5×	180 0.9×	30 1.1×	32 1.3×	6	386
Y. de Conchy France	8	493 0.9×	211 0.9×	153 0.8×	44 1.6×	18 0.8×	8	495
K. A. Pfitzer United States	12	630 1.2×	216 1.0×	245 1.3×	25 0.9×	7 0.3×	21	644
J. P. Glore United States	5	544 1.0×	113 0.5×	248 1.3×	61 2.2×	20 0.8×	6	558
Walter J. Heikkila United States	12	648 1.2×	235 1.0×	287 1.5×	56 2.0×	47 2.0×	23	661
B. G. Burek United States	5	334 0.6×	84 0.4×	130 0.7×	41 1.5×	27 1.1×	6	336

Countries citing papers authored by S. Ullaland

Since Specialization

Citations

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

Fields of papers citing papers by S. Ullaland

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of S. Ullaland

This figure shows the co-authorship network connecting the top 25 collaborators of S. Ullaland. A scholar is included among the top collaborators of S. Ullaland 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 S. Ullaland. S. Ullaland 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

Søraas, F., et al.. (1999). Propagation velocities and dimensions of plasmoid structures in the near‐Earth magnetotail. Geophysical Research Letters. 26(21). 3269–3272. 3 indexed citations

Ullaland, S., B. Wilken, Qiugang Zong, et al.. (1998). X-line formation in the near-earth magnetotail during magnetospheric substorms. 238. 401–404. 1 indexed citations

Лазутин, Л. Л., A. Korth, H. J. Singer, et al.. (1998). Radiation Belt Proton Contribution to Substorm Structure and Dynamics. 238. 547–550. 1 indexed citations

Korth, A., R. Friedel, D. N. Baker, et al.. (1994). Dynamics of the plasma sheet in the dawn sector of the magnetosphere: Observations from CRRES. MPG.PuRe (Max Planck Society). 315–320. 4 indexed citations

Korth, A., G. Kremser, B. Wilken, et al.. (1992). Electron and Proton wide-Angle Spectrometer (EPAS) on the CRRES spacecraft. Journal of Spacecraft and Rockets. 29(4). 609–614. 35 indexed citations

Kremser, G., A. Korth, S. Ullaland, et al.. (1988). Field‐aligned beams of energetic electrons (16 keV ≤ E ≤ 80 keV) observed at geosynchronous orbit at substorm onsets. Journal of Geophysical Research Atmospheres. 93(A12). 14453–14464. 32 indexed citations

Iversen, I. B., Hiroshi Miyaoka, Noboru Sato, S. Ullaland, & Ryoichi Fujii. (1987). Preliminary results from the auroral zone ionosphere observations during the AZCO balloon campaign in 1985. Memoirs of National Institute of Polar Research. Special issue. 47(47). 36–43.

Torkar, K., W. Riedler, G. Kremser, et al.. (1987). A study of the interaction of VLF waves with equatorial electrons and its relationship to auroral X-rays in the morning sector. Planetary and Space Science. 35(10). 1231–1253. 8 indexed citations

Yamagishi, Hisao, Takayuki Ono, H. Fukunishi, et al.. (1984). Auroral zone X-ray pulsations associated with VLF pulsations: B15-3N balloon experiment. Memoirs of National Institute of Polar Research. Special issue. 31. 124–136. 3 indexed citations

10.

Kremser, G., A. Korth, S. Ullaland, et al.. (1984). Coordinated balloon-satellite studies of energetic electron precipitation mechanisms. 217. 305–308.

11.

Kangas, J., P. Tanskanen, A. Korth, et al.. (1984). Testing of Some Substorm Features by Multiple Balloon Observations. 217. 369–372. 2 indexed citations

12.

Iversen, I. B., L. P. Block, R. Grard, et al.. (1984). Simultaneous observations of a pulsation event from the ground, with balloons and with a geostationary satellite on August 12, 1978. Journal of Geophysical Research Atmospheres. 89(A8). 6775–6785. 13 indexed citations

13.

Kremser, G., Jan Magnus Bjordal, L. P. Block, et al.. (1982). Coordinated balloon‐satellite observations of energetic particles at the onset of a magnetospheric substorm. Journal of Geophysical Research Atmospheres. 87(A6). 4445–4453. 24 indexed citations

14.

Kremser, G., Jan Magnus Bjordal, I. B. Iversen, et al.. (1981). On the origin of electron precipitation in the auroral zone related to the onset of magnetospheric substorms. Advances in Space Research. 1(1). 279–282. 1 indexed citations

15.

Ullaland, S., Jan Magnus Bjordal, L. P. Block, et al.. (1980). SBARMO-79: Experiments and results. 152. 235–240. 3 indexed citations

16.

Pytte, T., Jan Magnus Bjordal, J. Stadsnes, et al.. (1974). Large-scale auroral-zone electron precipitation event, briefly interrupted during a negative magnetic impulse. Journal of Atmospheric and Terrestrial Physics. 36(1). 29–42. 3 indexed citations

17.

Pytte, T., H. Trefall, S. Ullaland, et al.. (1974). Long-duration balloon flights from northern Scandinavia to west of Iceland in June-July 1973. 6. 67–95. 1 indexed citations

18.

Bjordal, Jan Magnus, H. Trefall, S. Ullaland, et al.. (1971). On the morphology of auroral-zone X-ray events—I Dynamics of midnight events. Journal of Atmospheric and Terrestrial Physics. 33(4). 605–626. 31 indexed citations

19.

Ullaland, S., K. Wilhelm, J. Kangas, & W. Riedler. (1970). Electron precipitation associated with a sudden commencement of a geomagnetic storm. Journal of Atmospheric and Terrestrial Physics. 32(9). 1545–1553. 19 indexed citations

20.

Trefall, H. & S. Ullaland. (1964). Long-Period Pulsations of Auroral-Zone X-Rays. Nature. 204(4964). 1148–1150. 3 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.

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