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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Earth Science 42 5304 4901 567 531 205 6082

Mervyn P. Freeman publications per year

The chart shows the history of publications by Mervyn P. Freeman between 1988 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Mervyn P. Freeman published across 38 years, from 1988 to 2025, averaging 6.7 papers a year. Output peaked at 19 publications in 2003. 8 of the 254 publications appeared in the last two years.

No. of publications
5 10 15
Bar chart. Horizontal axis: year, 1988 to 2025. Vertical axis: number of publications, 0 to 19. Peak 19 publications in 2003. 1988: 4 publications 1989: 2 publications 1990: 3 publications 1991: 5 publications 1992: 7 publications 1993: 6 publications 1994: 3 publications 1995: 4 publications 1996: 2 publications 1997: 2 publications 1998: 6 publications 1999: 3 publications 2000: 6 publications 2001: 11 publications 2002: 13 publications 2003: 19 publications 2004: 6 publications 2005: 8 publications 2006: 7 publications 2007: 6 publications 2008: 7 publications 2009: 11 publications 2010: 6 publications 2011: 7 publications 2012: 2 publications 2013: 13 publications 2014: 7 publications 2015: 3 publications 2016: 5 publications 2017: 5 publications 2018: 8 publications 2019: 13 publications 2020: 5 publications 2021: 9 publications 2022: 11 publications 2023: 11 publications 2024: 4 publications 2025: 4 publications
1988 2025

254 publications in total across all disciplines

View publications per year as a table
Mervyn P. Freeman: publications per year, 1988 to 2025
Year Publications
1988 4
1989 2
1990 3
1991 5
1992 7
1993 6
1994 3
1995 4
1996 2
1997 2
1998 6
1999 3
2000 6
2001 11
2002 13
2003 19
2004 6
2005 8
2006 7
2007 6
2008 7
2009 11
2010 6
2011 7
2012 2
2013 13
2014 7
2015 3
2016 5
2017 5
2018 8
2019 13
2020 5
2021 9
2022 11
2023 11
2024 4
2025 4
Total 254
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Mervyn P. Freeman publication distribution in Earth Science in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Earth Science in 2026. The highlighted bar marks where Mervyn P. Freeman sits on this spectrum.

No. of scientists
100 200 300 400 500
Bar chart with 58 bars. Horizontal axis: publications, 38–47 to 603+. Vertical axis: number of scientists, 0 to 557. Most scientists, 557, have 128–137 publications. The last bar groups every scientist with 603 publications or more. The highlighted bar, 198–207 publications, is where this scientist sits. 38–47 publications: 5 scientists 48–57 publications: 33 scientists 58–67 publications: 94 scientists 68–77 publications: 161 scientists 78–87 publications: 278 scientists 88–97 publications: 376 scientists 98–107 publications: 404 scientists 108–117 publications: 484 scientists 118–127 publications: 540 scientists 128–137 publications: 557 scientists 138–147 publications: 491 scientists 148–157 publications: 495 scientists 158–167 publications: 458 scientists 168–177 publications: 490 scientists 178–187 publications: 414 scientists 188–197 publications: 401 scientists 198–207 publications: 333 scientists 208–217 publications: 292 scientists 218–227 publications: 290 scientists 228–237 publications: 262 scientists 238–247 publications: 243 scientists 248–257 publications: 208 scientists 258–267 publications: 185 scientists 268–277 publications: 147 scientists 278–287 publications: 128 scientists 288–297 publications: 119 scientists 298–307 publications: 120 scientists 308–317 publications: 107 scientists 318–327 publications: 93 scientists 328–337 publications: 87 scientists 338–347 publications: 64 scientists 348–357 publications: 87 scientists 358–367 publications: 60 scientists 368–377 publications: 60 scientists 378–387 publications: 34 scientists 388–397 publications: 50 scientists 398–407 publications: 44 scientists 408–417 publications: 31 scientists 418–427 publications: 39 scientists 428–437 publications: 27 scientists 438–447 publications: 36 scientists 448–457 publications: 27 scientists 458–467 publications: 29 scientists 468–477 publications: 30 scientists 478–487 publications: 19 scientists 488–497 publications: 15 scientists 498–507 publications: 18 scientists 508–517 publications: 19 scientists 518–527 publications: 16 scientists 528–537 publications: 10 scientists 538–547 publications: 11 scientists 548–557 publications: 14 scientists 558–567 publications: 11 scientists 568–577 publications: 7 scientists 578–587 publications: 14 scientists 588–597 publications: 5 scientists 598–602 publications: 4 scientists 603+ publications: 100 scientists
38–47 publications 603+

This scientist: 205 publications — 65th percentile

65% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 603 publications or more.

View publications distribution as a table
Number of Earth Science scientists by publication count, Research.com 2026 ranking edition. Based on 9,176 ranked scientists.
Publications Scientists This scientist
38–47 5
48–57 33
58–67 94
68–77 161
78–87 278
88–97 376
98–107 404
108–117 484
118–127 540
128–137 557
138–147 491
148–157 495
158–167 458
168–177 490
178–187 414
188–197 401
198–207 333 205
208–217 292
218–227 290
228–237 262
238–247 243
248–257 208
258–267 185
268–277 147
278–287 128
288–297 119
298–307 120
308–317 107
318–327 93
328–337 87
338–347 64
348–357 87
358–367 60
368–377 60
378–387 34
388–397 50
398–407 44
408–417 31
418–427 39
428–437 27
438–447 36
448–457 27
458–467 29
468–477 30
478–487 19
488–497 15
498–507 18
508–517 19
518–527 16
528–537 10
538–547 11
548–557 14
558–567 11
568–577 7
578–587 14
588–597 5
598–602 4
603+ 100
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Mervyn P. Freeman D-index placement in Earth Science in 2026

The chart shows the D-index (discipline H-index) distribution of Earth Science scientists ranked by Research.com in 2026. The highlighted bar marks where Mervyn P. Freeman sits on this spectrum.

No. of scientists
100 200 300
Bar chart with 77 bars. Horizontal axis: D-Index, 30 to 106+. Vertical axis: number of scientists, 0 to 389. Most scientists, 389, have 36 D-Index. The last bar groups every scientist with 106 D-Index or more. The highlighted bar, 42 D-Index, is where this scientist sits. 30 D-Index: 144 scientists 31 D-Index: 215 scientists 32 D-Index: 278 scientists 33 D-Index: 379 scientists 34 D-Index: 366 scientists 35 D-Index: 372 scientists 36 D-Index: 389 scientists 37 D-Index: 366 scientists 38 D-Index: 344 scientists 39 D-Index: 349 scientists 40 D-Index: 296 scientists 41 D-Index: 289 scientists 42 D-Index: 277 scientists 43 D-Index: 279 scientists 44 D-Index: 248 scientists 45 D-Index: 257 scientists 46 D-Index: 212 scientists 47 D-Index: 202 scientists 48 D-Index: 207 scientists 49 D-Index: 204 scientists 50 D-Index: 183 scientists 51 D-Index: 178 scientists 52 D-Index: 182 scientists 53 D-Index: 178 scientists 54 D-Index: 163 scientists 55 D-Index: 117 scientists 56 D-Index: 163 scientists 57 D-Index: 120 scientists 58 D-Index: 113 scientists 59 D-Index: 136 scientists 60 D-Index: 135 scientists 61 D-Index: 96 scientists 62 D-Index: 103 scientists 63 D-Index: 83 scientists 64 D-Index: 103 scientists 65 D-Index: 83 scientists 66 D-Index: 89 scientists 67 D-Index: 92 scientists 68 D-Index: 89 scientists 69 D-Index: 78 scientists 70 D-Index: 75 scientists 71 D-Index: 53 scientists 72 D-Index: 62 scientists 73 D-Index: 54 scientists 74 D-Index: 35 scientists 75 D-Index: 52 scientists 76 D-Index: 50 scientists 77 D-Index: 32 scientists 78 D-Index: 37 scientists 79 D-Index: 20 scientists 80 D-Index: 33 scientists 81 D-Index: 36 scientists 82 D-Index: 34 scientists 83 D-Index: 34 scientists 84 D-Index: 24 scientists 85 D-Index: 19 scientists 86 D-Index: 18 scientists 87 D-Index: 26 scientists 88 D-Index: 30 scientists 89 D-Index: 17 scientists 90 D-Index: 21 scientists 91 D-Index: 19 scientists 92 D-Index: 15 scientists 93 D-Index: 14 scientists 94 D-Index: 20 scientists 95 D-Index: 9 scientists 96 D-Index: 10 scientists 97 D-Index: 15 scientists 98 D-Index: 13 scientists 99 D-Index: 3 scientists 100 D-Index: 13 scientists 101 D-Index: 3 scientists 102 D-Index: 9 scientists 103 D-Index: 4 scientists 104 D-Index: 6 scientists 105 D-Index: 6 scientists 106+ D-Index: 98 scientists
30 D-Index 106+

This scientist: 42 D-Index — 44th percentile

44% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 106 D-Index or more.

View D-Index distribution as a table
Number of Earth Science scientists by D-index, Research.com 2026 ranking edition. Based on 9,176 ranked scientists.
D-Index Scientists This scientist
30 144
31 215
32 278
33 379
34 366
35 372
36 389
37 366
38 344
39 349
40 296
41 289
42 277 42
43 279
44 248
45 257
46 212
47 202
48 207
49 204
50 183
51 178
52 182
53 178
54 163
55 117
56 163
57 120
58 113
59 136
60 135
61 96
62 103
63 83
64 103
65 83
66 89
67 92
68 89
69 78
70 75
71 53
72 62
73 54
74 35
75 52
76 50
77 32
78 37
79 20
80 33
81 36
82 34
83 34
84 24
85 19
86 18
87 26
88 30
89 17
90 21
91 19
92 15
93 14
94 20
95 9
96 10
97 15
98 13
99 3
100 13
101 3
102 9
103 4
104 6
105 6
106+ 98
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Overview

Mervyn P. Freeman is affiliated with the British Antarctic Survey in the United Kingdom. The scientist's research spans multiple areas within physics, earth sciences, and molecular biology, with key focuses on space weather, geomagnetism, and ionospheric dynamics.

Freeman's research output covers a range of main fields of study including:

  • Physics and Astronomy
  • Biochemistry, Genetics and Molecular Biology
  • Earth and Planetary Sciences

Within these broader fields, their subfields of study include:

  • Astronomy and Astrophysics
  • Molecular Biology
  • Geophysics
  • Electrical and Electronic Engineering
  • Oceanography

The scientist's work concentrates on several prominent topics, such as:

  • Ionosphere and magnetosphere dynamics
  • Geomagnetism and paleomagnetism studies
  • Earthquake detection and analysis
  • Solar and space plasma dynamics
  • Astro and planetary science
  • Planetary science and exploration
  • Geophysics and gravity measurements

Frequent coauthors in their research include:

  • G. Chisham
  • C. Forsyth
  • A. W. Smith
  • I. J. Rae
  • Michael D. Hartinger

The scientist's publications have appeared primarily in specialized venues, with frequent publication outlets being:

  • Journal of Geophysical Research Space Physics
  • Space Weather
  • Geophysical Research Letters
  • Journal of Space Weather and Space Climate
  • Earth and Planetary Physics

Notable recent papers include:

  • Probabilistic Forecasts of Storm Sudden Commencements From Interplanetary Shocks Using Machine Learning, 2020, Space Weather
  • Geomagnetically induced currents during the 07-08 September 2017 disturbed period: a global perspective, 2021, Journal of Space Weather and Space Climate
  • Modeling the Geomagnetic Response to the September 2017 Space Weather Event Over Fennoscandia Using the Space Weather Modeling Framework: Studying the Impacts of Spatial Resolution, 2021, Space Weather
  • Interhemispheric Comparisons of Large Nighttime Magnetic Perturbation Events Relevant to GICs, 2020, Journal of Geophysical Research Space Physics
  • The Impact of Sudden Commencements on Ground Magnetic Field Variability: Immediate and Delayed Consequences, 2021, Space Weather

Best Publications

  • A decade of the Super Dual Auroral Radar Network (SuperDARN): scientific achievements, new techniques and future directions

    G. Chisham;M. Lester;Steve E. Milan;M.P. Freeman

  • A study of an expanding interplanetary magnetic cloud and its interaction with the Earth's magnetosphere: The interplanetary aspect

    Charlie J. Farrugia;L. F. Burlaga;V. A. Osherovich;I. G. Richardson

  • The excitation of plasma convection in the high‐latitude ionosphere

    Mike Lockwood;S. W. H. Cowley;M. P. Freeman

  • Pressure-driven magnetopause motions and attendant response on the ground

    Charlie J. Farrugia;M. P. Freeman;S. W. H. Cowley;D. J. Southwood

  • A new technique for determining Substorm Onsets and Phases from Indices of the Electrojet (SOPHIE)

    C. Forsyth;I. J. Rae;J. C. Coxon;M. P. Freeman

  • Dayside ionospheric convection changes in response to long‐period interplanetary Magnetic field oscillations: Determination of the ionospheric phase velocity

    M. A. Saunders;M. P. Freeman;D. J. Southwood;S. W. H. Cowley

  • The earth's magnetosphere under continued forcing - Substorm activity during the passage of an interplanetary magnetic cloud

    Charlie J. Farrugia;M. P. Freeman;L. F. Burlaga;R. P. Lepping

  • The interaction of a magnetic cloud with the Earth: Ionospheric convection in the northern and southern hemispheres for a wide range of quasi‐steady interplanetary magnetic field conditions

    M. P. Freeman;Charlie J. Farrugia;L. F. Burlaga;M. R. Hairston

  • Evidence for a solar wind origin of the power law burst lifetime distribution of the AE indices

    M. P. Freeman;N. W. Watkins;D. J. Riley

  • On the character and distribution of lower-frequency radio emissions at Saturn and their relationship to substorm-like events

    C.M. Jackman;L. Lamy;Mervyn P. Freeman;P. Zarka

  • On the association between northward turnings of the interplanetary magnetic field and substorm onsets

    S. K. Morley;M. P. Freeman

  • The ionospheric signature of flux transfer events

    S. W. H. Cowley;M. P. Freeman;Mike Lockwood;M. F. Smith

  • A minimal substorm model that explains the observed statistical distribution of times between substorms

    Mervyn P. Freeman;Simon A. Morley

  • The effect of magnetospheric erosion on mid- and high-latitude ionospheric flows

    M.P. Freeman;D.J. Southwood

  • The response of the large scale ionospheric convection pattern to changes in the IMF and substorms - Results from the SUNDIAL 1987 campaign

    M. Lester;O. De La Beaujardiere;J. C. Foster;M. P. Freeman

  • Saturn's dynamic magnetotail: A comprehensive magnetic field and plasma survey of plasmoids and traveling compression regions and their role in global magnetospheric dynamics

    Caitriona M. Jackman;Caitriona M. Jackman;Caitriona M. Jackman;J.A. Slavin;M.G. Kivelson;M.G. Kivelson;D.J. Southwood

  • Post midnight VLF chorus events, a substorm signature observed at the ground nearL= 4

    A. J. Smith;M. P. Freeman;G. D. Reeves

  • On the use of IMAGE FUV for estimating the latitude of the open/closed magnetic field line boundary in the ionosphere

    P. D. Boakes;P. D. Boakes;S. E. Milan;G. A. Abel;M. P. Freeman

  • Incorrect Likelihood Methods Were Used to Infer Scaling Laws of Marine Predator Search Behaviour

    Andrew M. Edwards;Mervyn P. Freeman;Greg A. Breed;Greg A. Breed;Greg A. Breed;Ian D. Jonsen;Ian D. Jonsen

  • The determination of time‐stationary two‐dimensional convection patterns with single‐station radars

    M. P. Freeman;J. M. Ruohoniemi;R. A. Greenwald

  • A statistical comparison of SuperDARN spectral width boundaries and DMSP particle precipitation boundaries in the morning sector ionosphere

    G. Chisham;M. P. Freeman;T. Sotirelis;R. A. Greenwald

Frequent Co-Authors

Charles J. Farrugia
Charles J. Farrugia University of New Hampshire
Caitriona M. Jackman
Caitriona M. Jackman University of Southampton
Jesper Gjerloev
Jesper Gjerloev Johns Hopkins University Applied Physics Laboratory
Mark Lester
Mark Lester University of Leicester
Geoffrey D. Reeves
Geoffrey D. Reeves Los Alamos National Laboratory
I. J. Rae
I. J. Rae Northumbria University
Stanley W. H. Cowley
Stanley W. H. Cowley University of Leicester
Steve E. Milan
Steve E. Milan University of Leicester
Mike Lockwood
Mike Lockwood University of Reading
David J. Southwood
David J. Southwood Imperial College London

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