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Ralph E. Milliken

Ralph E. Milliken

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Earth Science 67 1202 1065 546 468 405 19308

Ralph E. Milliken publications per year

The chart shows the history of publications by Ralph E. Milliken between 2000 and 2026, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Ralph E. Milliken published across 27 years, from 2000 to 2026, averaging 16.3 papers a year. Output peaked at 38 publications in 2008. 7 of the 439 publications appeared in the last two years.

No. of publications
10 20 30
Bar chart. Horizontal axis: year, 2000 to 2026. Vertical axis: number of publications, 0 to 38. Peak 38 publications in 2008. 2000: 2 publications 2001: 0 publications 2002: 1 publication 2003: 7 publications 2004: 2 publications 2005: 6 publications 2006: 9 publications 2007: 28 publications 2008: 38 publications 2009: 26 publications 2010: 24 publications 2011: 29 publications 2012: 13 publications 2013: 23 publications 2014: 32 publications 2015: 29 publications 2016: 26 publications 2017: 24 publications 2018: 26 publications 2019: 26 publications 2020: 19 publications 2021: 22 publications 2022: 4 publications 2023: 6 publications 2024: 10 publications 2025: 6 publications 2026: 1 publication
2000 2026

439 publications in total across all disciplines

View publications per year as a table
Ralph E. Milliken: publications per year, 2000 to 2026
Year Publications
2000 2
2001 0
2002 1
2003 7
2004 2
2005 6
2006 9
2007 28
2008 38
2009 26
2010 24
2011 29
2012 13
2013 23
2014 32
2015 29
2016 26
2017 24
2018 26
2019 26
2020 19
2021 22
2022 4
2023 6
2024 10
2025 6
2026 1
Total 439
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Ralph E. Milliken 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 Ralph E. Milliken 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, 398–407 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: 405 publications — 95th percentile

95% 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
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 44 405
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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Ralph E. Milliken 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 Ralph E. Milliken 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, 67 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: 67 D-Index — 87th percentile

87% 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
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 67
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

Ralph E. Milliken is affiliated with Brown University in the United States. Their research focuses primarily on fields related to physics and astronomy, with a significant concentration on astronomy and astrophysics. Milliken's work extensively covers planetary science and exploration, astro and planetary science, isotope analysis in ecology, geological and geochemical analysis, space science and extraterrestrial life, high-pressure geophysics and materials, as well as geology and paleoclimatology research.

Milliken has published research in a variety of scientific venues, demonstrating engagement with both specialized and broad audiences. Frequent publication venues include Icarus, Journal of Geophysical Research Planets, Zenodo (CERN European Organization for Nuclear Research), Meteoritics and Planetary Science, and Geochimica et Cosmochimica Acta. This diverse range of journals indicates a multidisciplinary approach within planetary and geophysical sciences.

Collaborations form a notable part of Milliken's scholarly activities, with frequent coauthors including Tomoki Nakamura, M. Matsuoka, T. Hiroi, Shogo Tachibana, and Eri Tatsumi. These colleagues have collectively contributed to planetary geology, asteroid studies, and related disciplines.

Some recent papers authored in collaboration with others highlight the scope and focus of their research. These include:

  • Formation and evolution of carbonaceous asteroid Ryugu: Direct evidence from returned samples (2022), published in Science
  • Asteroid (101955) Bennu in the laboratory: Properties of the sample collected by OSIRIS-REx (2024), published in Meteoritics and Planetary Science
  • Thermally altered subsurface material of asteroid (162173) Ryugu (2021), published in Nature Astronomy
  • Updated Perspectives and Hypotheses on the Mineralogy of Lower Mt. Sharp, Mars, as Seen From Orbit (2020), published in Journal of Geophysical Research Planets
  • Merging Perspectives on Secondary Minerals on Mars: A Review of Ancient Water-Rock Interactions in Gale Crater Inferred from Orbital and In-Situ Observations (2021), published in Minerals

The topics addressed in these works reflect planetary science themes such as asteroid composition and evolution, Mars mineralogy, water-rock interactions, and sample-return analysis. Milliken's involvement in studies of Ryugu and Bennu asteroids corresponds with broader efforts to understand solar system formation and evolution through direct sample analysis.

Best Publications

  • A habitable fluvio-lacustrine environment at Yellowknife Bay, Gale crater, Mars.

    J. P. Grotzinger;D. Y. Sumner;L. C. Kah;K. Stack

  • Hydrated silicate minerals on Mars observed by the Mars Reconnaissance Orbiter CRISM instrument

    John F. Mustard;Scott L. Murchie;S. M. Pelkey;B. L. Ehlmann

  • Recent ice ages on Mars

    James W. Head;John F. Mustard;Mikhail A. Kreslavsky;Ralph E. Milliken

  • Orbital Identification of Carbonate-Bearing Rocks on Mars

    Bethany L. Ehlmann;John F. Mustard;Scott L. Murchie;Francois Poulet

  • Identification of hydrated silicate minerals on Mars using MRO‐CRISM: Geologic context near Nili Fossae and implications for aqueous alteration

    Bethany L. Ehlmann;John F. Mustard;Gregg A. Swayze;Roger N. Clark

  • Mineralogy of a Mudstone at Yellowknife Bay, Gale Crater, Mars

    D.T. Vaniman;D.L. Bish;D.W. Ming;T.F. Bristow

  • Deposition, exhumation, and paleoclimate of an ancient lake deposit, Gale crater, Mars.

    J.P. Grotzinger;S. Gupta;M. C. Malin;D.M. Rubin

  • A synthesis of Martian aqueous mineralogy after 1 Mars year of observations from the Mars Reconnaissance Orbiter

    Scott L. Murchie;John F. Mustard;Bethany L. Ehlmann;Ralph E. Milliken

  • Direct evidence of surface exposed water ice in the lunar polar regions

    Shuai Li;Shuai Li;Paul G. Lucey;Ralph E. Milliken;Paul O. Hayne

  • Paleoclimate of Mars as captured by the stratigraphic record in Gale Crater

    R. E. Milliken;J. P. Grotzinger;B. J. Thomson

  • Temporal and Spatial Variability of Lunar Hydration As Observed by the Deep Impact Spacecraft

    Jessica M. Sunshine;Tony L. Farnham;Lori M. Feaga;Olivier Groussin

  • Volatile and organic compositions of sedimentary rocks in Yellowknife Bay, Gale crater, Mars.

    Douglas W. Ming;P. D. Archer;D. P. Glavin;J. L. Eigenbrode

  • CRISM multispectral summary products: Parameterizing mineral diversity on Mars from reflectance

    S. M. Pelkey;J. F. Mustard;S. Murchie;R. T. Clancy

  • Phyllosilicate diversity and past aqueous activity revealed at Mawrth Vallis, Mars

    Janice L. Bishop;Eldar Z Noe Dobrea;Nancy K. McKeown;Mario Parente

  • Opaline silica in young deposits on Mars

    Ralph E. Milliken;Gregg A. Swayze;Raymond E. Arvidson;Janice L Bishop

  • Formation and evolution of carbonaceous asteroid Ryugu: Direct evidence from returned samples

    Unknown

  • The surface composition of asteroid 162173 Ryugu from Hayabusa2 near-infrared spectroscopy

    K. Kitazato;R. E. Milliken;T. Iwata;T. Iwata;M. Abe;M. Abe

  • Constraints on the origin and evolution of the layered mound in Gale Crater, Mars using Mars Reconnaissance Orbiter data

    B.J. Thomson;N.T. Bridges;R. Milliken;A. Baldridge

  • Redox stratification of an ancient lake in Gale crater, Mars

    J. A. Hurowitz;J. P. Grotzinger;W. W. Fischer;S. M. McLennan

  • Viscous flow features on the surface of Mars: Observations from high‐resolution Mars Orbiter Camera (MOC) images

    R. E. Milliken;J. F. Mustard;D. L. Goldsby

  • In Situ Radiometric and Exposure Age Dating of the Martian Surface

    K. A. Farley;C. Malespin;P. Mahaffy;J. P. Grotzinger

Frequent Co-Authors

Scott L. Murchie
Scott L. Murchie Johns Hopkins University Applied Physics Laboratory
John F. Mustard
John F. Mustard Brown University
John P. Grotzinger
John P. Grotzinger California Institute of Technology
François Poulet
François Poulet University of Paris-Saclay
Janice L. Bishop
Janice L. Bishop Search for Extraterrestrial Intelligence
Bethany L. Ehlmann
Bethany L. Ehlmann University of Colorado Boulder
Gregg A. Swayze
Gregg A. Swayze United States Geological Survey
Jeffrey E. Moersch
Jeffrey E. Moersch University of Tennessee at Knoxville
William V. Boynton
William V. Boynton University of Arizona
James J. Wray
James J. Wray Georgia Institute of Technology

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