Photo of Ian Cohen

Ian Cohen

View All People
Space Physicist
240-228-1637
  • Ph.D., Physics
    2015, University of New Hampshire
  • B.A., Astronomy & Physics
    2010, Boston University

Dr. Ian J. Cohen is a Senior Professional Staff member at the Johns Hopkins Applied Physics Laboratory (APL).  He received a B.A. with distinction in Astronomy & Physics from Boston University in 2010. From 2010 to 2015, he attended the University of New Hampshire, where he obtained a Ph.D. in Physics while working in the Magnetosphere-Ionosphere Research Lab within the UNH Space Science Center. He joined the APL Solar & Space Physics Group (SRP) in 2015 as a Postdoctoral Fellow working as part of the  Energetic Particle Detector (EPD) investigation for NASA's Magnetospheric Multiscale (MMS) mission.

His research interests focus on experimental space physics, specifically including magnetosphere-iononsphere coupling (e.g., ion outflow, auroral dynamics, and ionospheric feedback); energetic particle dynamics; and plasma and energetic particle instrumentation. He currently serves as Deputy Lead for the MMS/EPD investigation and Instrument Scientist for the MMS Energetic Ion Spectrometer (EIS) instrument and Deputy Project Scientist for NASA's Interstellar Mapping and Acceleration Probe (IMAP) mission. In addition to his mission leadership roles, Ian actively engages in the Heliophysics community as Chair of the AGU/SPA Section's Advocacy Committee, which engages with stakeholders and policymakers on Capitol Hill to educate and promote the benefits of heliophysics research.

Notable Awards and Leadership

Year(s) Description
2021-Present Member, Executive Committee of the NASA LWS Program Analysis Group (LPAG)
2021-Present Member, NSF Geospace Environment Modeling (GEM) Steering Committee
2020-Present Chair, American Geophysical Union (AGU) Space Physics & Aeronomy (SPA) Section Advocacy Committee
2014 - Present Member of Scientist Network, NSF Aurorasaurus Project
2013 - Present Member, American Astronomical Society (AAS) Solar Physics Division (SPD) Public Policy Committee
2013 - 2015 Student Representative, NSF Geospace Environment Modeling (GEM) Steering Committee
2013 NASA Student Ambassador
2011-2013 Graduate Student Researchers Program (GSRP) fellowship, NASA Goddard Space Flight Center

Scholarly Publications

Direct Evidence for Electron Acceleration Within Ion‐Scale Flux Rope

Geophysical Research Letters, 2020
, (2020), Direct Evidence for Electron Acceleration Within Ion‐Scale Flux Rope, Geophysical Research Letters

Characteristics of Escaping Magnetospheric Ions Associated With Magnetic Field Fluctuations

Journal of Geophysical Research: Space Physics, 2020
S. H. Lee, D. G. Sibeck, Y. Lin, Z. Guo, M. L. Adrian, M. V. D. Silveira, I. J. Cohen, B. H. Mauk, G. M. Mason, G. C. Ho, B. L. Giles, R. B. Torbert, C. T. Russell, H. Wei, J. L. Burch, G. Vichare, A. K. Sinha, (2020), Characteristics of Escaping Magnetospheric Ions Associated With Magnetic Field Fluctuations, Journal of Geophysical Research: Space Physics , 125, 4, https://doi.org/10.1029/2019ja027337

Microscopic, Multipoint Characterization of Foreshock Bubbles With Magnetospheric Multiscale (MMS)

Journal of Geophysical Research: Space Physics, 2020
D. L. Turner, T. Z. Liu, III L. B. Wilson, I. J. Cohen, D. G. Gershman, J. F. Fennell, J. B. Blake, B. H. Mauk, N. Omidi, J. L. Burch, (2020), Microscopic, Multipoint Characterization of Foreshock Bubbles With Magnetospheric Multiscale (MMS), Journal of Geophysical Research: Space Physics , 125, 7, https://doi.org/10.1029/2019ja027707

Delayed Arrival of Energetic Solar Particles at MMS on 16 July 2017

Journal of Geophysical Research: Space Physics, 2019
J. B. Blake, J. F. Fennell, D. L. Turner, I. J. Cohen, B. H. Mauk, (2019), Delayed Arrival of Energetic Solar Particles at MMS on 16 July 2017, Journal of Geophysical Research: Space Physics , https://doi.org/10.1029/2018ja026341

Drift‐Dispersed Flux Dropouts of Energetic Electrons Observed in Earth's Middle Magnetosphere by the Magnetospheric Multiscale (MMS) Mission

Geophysical Research Letters, 2019
Ian J. Cohen, Barry H. Mauk, Drew L. Turner, Joseph F. Fennell, J. Bernard Blake, Geoffrey D. Reeves, Trevor W. Leonard, Daniel N. Baker, Allison N. Jaynes, Harlan E. Spence, Christine Gabrielse, (2019), Drift-Dispersed Flux Dropouts of Energetic Electrons Observed in Earth's Middle Magnetosphere by the Magnetospheric Multiscale (MMS) Mission, Geophysical Research Letters , 46, 6, 3069--3078, https://doi.org/10.1029/2019gl082008

High‐Resolution Measurements of the Cross‐Shock Potential, Ion Reflection, and Electron Heating at an Interplanetary Shock by MMS

Journal of Geophysical Research: Space Physics, 2019
Ian J. Cohen, Steven J. Schwartz, Katherine A. Goodrich, Narges Ahmadi, Robert E. Ergun, Stephen A. Fuselier, Mihir I. Desai, Eric R. Christian, David J. McComas, Gary P. Zank, Jason R. Shuster, Sarah K. Vines, Barry H. Mauk, Robert B. Decker, Brian J. Anderson, Joseph H. Westlake, Olivier Le Contel, Hugo Breuillard, Barbara L. Giles, Roy B. Torbert, James L. Burch, (2019), High-Resolution Measurements of the Cross-Shock Potential, Ion Reflection, and Electron Heating at an Interplanetary Shock by MMS, Journal of Geophysical Research: Space Physics , 124, 6, 3961--3978, https://doi.org/10.1029/2018ja026197

Rocket Investigation of Current Closure in the Ionosphere (RICCI): A novel application of CubeSats from a sounding rocket platform

Advances in Space Research, 2019
, (2019), Rocket Investigation of Current Closure in the Ionosphere (RICCI): A novel application of CubeSats from a sounding rocket platform, Advances in Space Research

Investigation of Mass‐/Charge‐Dependent Escape of Energetic Ions Across the Magnetopauses of Earth and Jupiter

Journal of Geophysical Research: Space Physics, 2019
B. H. Mauk, I. J. Cohen, D. K. Haggerty, G. B. Hospodarsky, J. E. P. Connerney, B. J. Anderson, F. Bagenal, R. W. Ebert, S. J. Bolton, J. L. Burch, S. M. Levin, R. B. Torbert, S. K. Vines, J. H. Westlake, (2019), Investigation of Mass-/Charge-Dependent Escape of Energetic Ions Across the Magnetopauses of Earth and Jupiter, Journal of Geophysical Research: Space Physics , 124, 7, 5539--5567, https://doi.org/10.1029/2019ja026626

Cusp and Nightside Auroral Sources of O + in the Plasma Sheet

Journal of Geophysical Research: Space Physics, 2019
, (2019), Cusp and Nightside Auroral Sources of O + in the Plasma Sheet, Journal of Geophysical Research: Space Physics

MMS Measurements and Modeling of Peculiar Electromagnetic Ion Cyclotron Waves

Geophysical Research Letters, 2019
, (2019), MMS Measurements and Modeling of Peculiar Electromagnetic Ion Cyclotron Waves, Geophysical Research Letters

Overview of the Rocket Experiment for Neutral Upwelling Sounding Rocket 2 (RENU2)

Geophysical Research Letters, 2019
Marc R. Lessard, Bruce Fritz, Brent Sadler, Ian Cohen, David Kenward, Niharika Godbole, James H. Clemmons, James H. Hecht, Kristina A. Lynch, Meghan Harrington, Thomas M. Roberts, David Hysell, Geoff Crowely, Fred Sigernes, Mikko Syrjäsuo, Pål Ellingson, Noora Partamies, Jøran Moen, Lasse Clausen, Kjellmar Oksavik, Timothy Yeoman, (2019), Overview of the Rocket Experiment for Neutral Upwelling Sounding Rocket 2 (RENU2), Geophysical Research Letters

The Space Physics Environment Data Analysis System (SPEDAS)

Space Science Reviews, 2019
, (2019), The Space Physics Environment Data Analysis System (SPEDAS), Space Science Reviews

Effects in the Near‐Magnetopause Magnetosheath Elicited by Large‐Amplitude Alfvénic Fluctuations Terminating in a Field and Flow Discontinuity

Journal of Geophysical Research: Space Physics, 2018
C. J. Farrugia, I. J. Cohen, B. J. Vasquez, N. Lugaz, L. Alm, R. B. Torbert, M. R. Argall, K. Paulson, B. Lavraud, D. J. Gershman, F. T. Gratton, H. Matsui, A. Rogers, T. G. Forbes, D. Payne, R. E. Ergun, B. Mauk, J. L. Burch, C. T. Russell, R. J. Strangeway, J. Shuster, R. Nakamura, S. A. Fuselier, B. L. Giles, Y. V. Khotyaintsev, P. A. Lindqvist, G.T. Marklund, S. M. Petrinec, C. J. Pollock, (2018), Effects in the Near-Magnetopause Magnetosheath Elicited by Large-Amplitude Alfvenic Fluctuations Terminating in a Field and Flow Discontinuity, Journal of Geophysical Research: Space Physics , 123, 11, 8983--9004, https://doi.org/10.1029/2018ja025724

Autogenous and efficient acceleration of energetic ions upstream of Earth's bow shock

Nature, 2018
D. L. Turner, L. B. Wilson, T. Z. Liu, I. J. Cohen, S. J. Schwartz, A. Osmane, J. F. Fennell, J. H. Clemmons, J. B. Blake, J. Westlake, B. H. Mauk, A. N. Jaynes, T. Leonard, D. N. Baker, R. J. Strangeway, C. T. Russell, D. J. Gershman, L. Avanov, B. L. Giles, R. B. Torbert, J. Broll, R. G. Gomez, S. A. Fuselier, J. L. Burch, (2018), Autogenous and efficient acceleration of energetic ions upstream of Earth's bow shock, Nature, 561, 7722, 206-+

Multiscale Currents Observed by MMS in the Flow Braking Region

Journal of Geophysical Research-Space Physics, 2018
R Nakamura, A Varsani, KJ Genestreti, O Le Contel, T Nakamura, W Baumjohann, T Nagai, A Artemyev, J Birn, VA Sergeev, S Apatenkov, RE Ergun, SA Fuselier, DJ Gershman, BJ Giles, YV Khotyaintsev, PA Lindqvist, W Magnes, B Mauk, A Petrukovich, CT Russell, J Stawarz, RJ Strangeway, B Anderson, JL Burch, KR Bromund, I Cohen, D Fischer, A Jaynes, L Kepko, G Le, F Plaschke, G Reeves, HJ Singer, JA Slavin, RB Torbert, DL Turner, (2018), Multiscale Currents Observed by MMS in the Flow Braking Region, Journal of Geophysical Research-Space Physics, 123, 2, 1260-1278

New Insights into the Nature of Turbulence in the Earth's Magnetosheath Using Magnetospheric MultiScale Mission Data

Astrophysical Journal, 2018
H. Breuillard, L. Matteini, M. R. Argall, F. Sahraoui, M. Andriopoulou, O. Le Contel, A. Retino, L. Mirioni, S. Y. Huang, D. J. Gershman, R. E. Ergun, F. D. Wilder, K. A. Goodrich, N. Ahmadi, E. Yordanova, A. Vaivads, D. L. Turner, Yu. V. Khotyaintsev, D. B. Graham, P. -A. Lindqvist, A. Chasapis, J. L. Burch, R. B. Torbert, C. T. Russell, W. Magnes, R. J. Strangeway, F. Plaschke, T. E. Moore, B. L. Giles, W. R. Paterson, C. J. Pollock, B. Lavraud, S. A. Fuselier, I. J. Cohen, (2018), New Insights into the Nature of Turbulence in the Earth's Magnetosheath Using Magnetospheric MultiScale Mission Data, Astrophysical Journal, 859, 2

The Properties of Lion Roars and Electron Dynamics in Mirror Mode Waves Observed by the Magnetospheric MultiScale Mission

Journal of Geophysical Research-Space Physics, 2018
H Breuillard, O Le Contel, T Chust, M Berthomier, A Retino, DL Turner, R Nakamura, W Baumjohann, G Cozzani, F Catapano, A Alexandrova, L Mirioni, DB Graham, MR Argall, D Fischer, FD Wilder, DJ Gershman, A Varsani, PA Lindqvist, YV Khotyaintsev, G Marklund, RE Ergun, KA Goodrich, N Ahmadi, JL Burch, RB Torbert, G Needell, M Chutter, D Rau, I Dors, CT Russell, W Magnes, RJ Strangeway, KR Bromund, H Wei, F Plaschke, BJ Anderson, G Le, TE Moore, BL Giles, WR Paterson, CJ Pollock, JC Dorelli, LA Avanov, Y Saito, B Lavraud, SA Fuselier, BH Mauk, IJ Cohen, JF Fennell, (2018), The Properties of Lion Roars and Electron Dynamics in Mirror Mode Waves Observed by the Magnetospheric MultiScale Mission, Journal of Geophysical Research-Space Physics, 123, 1, 93-103

Kinetic Equilibrium of Dipolarization Fronts

Scientific Reports, 2018
Gurudas Ganguli, Chris Crabtree, Alex C. Fletcher, Erik Tejero, David Malaspina, Ian Cohen, (2018), Kinetic Equilibrium of Dipolarization Fronts, Scientific Reports , 8, 1, https://doi.org/10.1038/s41598-018-35349-9

Multipoint Observations of Energetic Particle Injections and Substorm Activity During a Conjunction Between Magnetospheric Multiscale (MMS) and Van Allen Probes

Journal of Geophysical Research: Space Physics, 2017
D. L. Turner, J. F. Fennell, J. B. Blake, S. G. Claudepierre, J. H. Clemmons, A. N. Jaynes, T. Leonard, D. N. Baker, I. J. Cohen, M. Gkioulidou, A. Y. Ukhorskiy, B. H. Mauk, C. Gabrielse, V. Angelopoulos, R. J. Strangeway, C. A. Kletzing, O. Le Contel, H. E. Spence, R. B. Torbert, J. L. Burch, G. D. Reeves, (2017), Multipoint Observations of Energetic Particle Injections and Substorm Activity During a Conjunction Between Magnetospheric Multiscale (MMS) and Van Allen Probes, Journal of Geophysical Research: Space Physics , 122, 11, 11,481--11,504, https://doi.org/10.1002/2017ja024554

Examining Coherency Scales, Substructure, and Propagation of Whistler Mode Chorus Elements With Magnetospheric Multiscale (MMS)

Journal of Geophysical Research: Space Physics, 2017
D. L. Turner, J. H. Lee, S. G. Claudepierre, J. F. Fennell, J. B. Blake, A. N. Jaynes, T. Leonard, F. D. Wilder, R. E. Ergun, D. N. Baker, I. J. Cohen, B. H. Mauk, R. J. Strangeway, D. P. Hartley, C. A. Kletzing, H. Breuillard, O. Le Contel, Yu. V. Khotyaintsev, R. B. Torbert, R. C. Allen, J. L. Burch, O. Santolik, (2017), Examining Coherency Scales, Substructure, and Propagation of Whistler Mode Chorus Elements With Magnetospheric Multiscale (MMS), Journal of Geophysical Research: Space Physics , https://doi.org/10.1002/2017ja024474

MMS observation of inverse energy dispersion in shock drift accelerated ions

Journal of Geophysical Research: Space Physics, 2017
S. H. Lee, D. G. Sibeck, K.‐J. Hwang, Y. Wang, M. V. D. Silveira, C. Chu, B. H. Mauk, I. J. Cohen, G. C. Ho, G. M. Mason, R. E. Gold, J. L. Burch, B. L. Giles, R. B. Torbert, C. T. Russell, H. Wei, (2017), MMS observation of inverse energy dispersion in shock drift accelerated ions, Journal of Geophysical Research: Space Physics , 122, 3, 3232--3246, https://doi.org/10.1002/2016ja023694

Statistical analysis of MMS observations of energetic electron escape observed at/beyond the dayside magnetopause

Journal of Geophysical Research: Space Physics, 2017
Ian J. Cohen, Barry H. Mauk, Brian J. Anderson, Joseph H. Westlake, David G. Sibeck, Drew L. Turner, Joseph F. Fennell, J. Bern Blake, Allison N. Jaynes, Trevor W. Leonard, Daniel N. Baker, Harlan E. Spence, Geoff D. Reeves, Barbara J. Giles, Robert J. Strangeway, Roy B. Torbert, James L. Burch, (2017), Statistical analysis of MMS observations of energetic electron escape observed at/beyond the dayside magnetopause, Journal of Geophysical Research: Space Physics , 122, 9, 9440--9463, https://doi.org/10.1002/2017ja024401

Storm time empirical model of O+ and O6+ distributions in the magnetosphere

Journal of Geophysical Research: Space Physics, 2017
R. C. Allen, S. A. Livi, S. K. Vines, J. Goldstein, I. Cohen, S. A. Fuselier, B. H. Mauk, H. E. Spence, (2017), Storm time empirical model of O+ and O6+ distributions in the magnetosphere, Journal of Geophysical Research: Space Physics , 122, 8, 8353--8374, https://doi.org/10.1002/2017ja024245

Dominance of high-energy (>150 keV) heavy ion intensities in Earth's middle to outer magnetosphere

Journal of Geophysical Research: Space Physics, 2017
Ian J. Cohen, Donald G. Mitchell, Lynn M. Kistler, Barry H. Mauk, Brian J. Anderson, Joseph H. Westlake, Shinichi Ohtani, Douglas C. Hamilton, Drew L. Turner, J. Bernard Blake, Joseph F. Fennell, Allison N. Jaynes, Trevor W. Leonard, Andrew J. Gerrard, Louis J. Lanzerotti, Robert C. Allen, James L. Burch, (2017), Dominance of high-energy (>150~keV) heavy ion intensities in Earth's middle to outer magnetosphere, Journal of Geophysical Research: Space Physics , 122, 9, 9282--9293, https://doi.org/10.1002/2017ja024351

Charge Proportional and Weakly Mass-Dependent Acceleration of Different Ion Species in the Earth's Magnetotail

Geophysical Research Letters, 2017
F. Catapano, G. Zimbardo, S. Perri, A. Greco, D. Delcourt, A. Retinò, I. J. Cohen, (2017), Charge Proportional and Weakly Mass-Dependent Acceleration of Different Ion Species in the Earth's Magnetotail, Geophysical Research Letters , 44, 20, 10,108--10,115, https://doi.org/10.1002/2017gl075092

Currents and associated electron scattering and bouncing near the diffusion region at Earth's magnetopause

Geophysical Research Letters, 2016
B. Lavraud, Y. C. Zhang, Y. Vernisse, D. J. Gershman, J. Dorelli, P. A. Cassak, J. Dargent, C. Pollock, B. Giles, N. Aunai, M. Argall, L. Avanov, A. Barrie, J. Burch, M. Chandler, L. J. Chen, G. Clark, I. Cohen, V. Coffey, J. P. Eastwood, J. Egedal, S. Eriksson, R. Ergun, C. J. Farrugia, S. A. Fuselier, V. Génot, D. Graham, E. Grigorenko, H. Hasegawa, C. Jacquey, I. Kacem, Y. Khotyaintsev, E. MacDonald, W. Magnes, A. Marchaudon, B. Mauk, T. E. Moore, T. Mukai, R. Nakamura, W. Paterson, E. Penou, T. D. Phan, A. Rager, A. Retino, Z. J. Rong, C. T. Russell, Y. Saito, J. A. Sauvaud, S. J. Schwartz, C. Shen, S. Smith, R. Strangeway, S. Toledo-Redondo, R. Torbert, D. L. Turner, S. Wang, S. Yokota, (2016), Currents and associated electron scattering and bouncing near the diffusion region at Earth's magnetopause, Geophysical Research Letters, 43, 7, 2016GL068359

Electron-scale measurements of magnetic reconnection in space

Science, 2016
J. L. Burch, R. B. Torbert, T. D. Phan, L. J. Chen, T. E. Moore, R. E. Ergun, J. P. Eastwood, D. J. Gershman, P. A. Cassak, M. R. Argall, S. Wang, M. Hesse, C. J. Pollock, B. L. Giles, R. Nakamura, B. H. Mauk, S. A. Fuselier, C. T. Russell, R. J. Strangeway, J. F. Drake, M. A. Shay, Yu V. Khotyaintsev, P. A. Lindqvist, G. Marklund, F. D. Wilder, D. T. Young, K. Torkar, J. Goldstein, J. C. Dorelli, L. A. Avanov, M. Oka, D. N. Baker, A. N. Jaynes, K. A. Goodrich, I. J. Cohen, D. L. Turner, J. F. Fennell, J. B. Blake, J. Clemmons, M. Goldman, D. Newman, S. M. Petrinec, K. J. Trattner, B. Lavraud, P. H. Reiff, W. Baumjohann, W. Magnes, M. Steller, W. Lewis, Y. Saito, V. Coffey, M. Chandler, (2016), Electron-scale measurements of magnetic reconnection in space, Science

A telescopic and microscopic examination of acceleration in the June 2015 geomagnetic storm: Magnetospheric Multiscale and Van Allen Probes study of substorm particle injection

Geophysical Research Letters, 2016
D. N. Baker, A. N. Jaynes, D. L. Turner, R. Nakamura, D. Schmid, B. H. Mauk, I. J. Cohen, J. F. Fennell, J. B. Blake, R. J. Strangeway, C. T. Russell, R. B. Torbert, J. C. Dorelli, D. J. Gershman, B. L. Giles, J. L. Burch, (2016), A telescopic and microscopic examination of acceleration in the June 2015 geomagnetic storm: Magnetospheric Multiscale and Van Allen Probes study of substorm particle injection, Geophysical Research Letters, 43, 12, 6051-6059

Dipolarization in the inner magnetosphere during a geomagnetic storm on 7 October 2015

Geophysical Research Letters, 2016
H. Matsui, P. J. Erickson, J. C. Foster, R. B. Torbert, M. R. Argall, B. J. Anderson, J. B. Blake, I. J. Cohen, R. E. Ergun, C. J. Farrugia, Yu. V. Khotyaintsev, H. Korth, P. -A. Lindqvist, W. Magnes, G. T. Marklund, B. H. Mauk, K. W. Paulson, C. T. Russell, R. J. Strangeway, D. L. Turner, (2016), Dipolarization in the inner magnetosphere during a geomagnetic storm on 7 October 2015, Geophysical Research Letters, 43, 18, 9397-9405

Electrodynamic context of magnetopause dynamics observed by magnetospheric multiscale

Geophysical Research Letters, 2016
Brian J. Anderson, Christopher T. Russell, Robert J. Strangeway, Ferdinand Plaschke, Werner Magnes, David Fischer, Haje Korth, Viacheslav G. Merkin, Robin J. Barnes, Colin L. Waters, Ian J. Cohen, Joseph H. Westlake, Barry H. Mauk, Hannes K. Leinweber, Daniel J. Gershman, Barbara L. Giles, Guan Le, Roy B. Torbert, James L. Burch, (2016), Electrodynamic context of magnetopause dynamics observed by magnetospheric multiscale, Geophysical Research Letters, 43, 12, 5988-5996

Modeling magnetospheric energetic particle escape across Earth's magnetopause as observed by the MMS mission

Geophysical Research Letters, 2016
Barry H. Mauk, Ian J. Cohen, Joseph H. Westlake, Brian J. Anderson, (2016), Modeling magnetospheric energetic particle escape across Earth's magnetopause as observed by the MMS mission, Geophysical Research Letters, 2016GL068856

Observations of Energetic Particle Escape at the Magnetopause: Early Results from the MMS Energetic Ion Spectrometer (EIS)

Geophysical Research Letters, 2016
I. J. Cohen, B. H. Mauk, B. J. Anderson, J. H. Westlake, D. G. Sibeck, B. L. Giles, C. J. Pollock, D. L. Turner, J. F. Fennell, J. B. Blake, J. H. Clemmons, A. N. Jaynes, D. N. Baker, J. V. Craft, H. E. Spence, J. T. Niehof, G. D. Reeves, R. B. Torbert, C. T. Russell, R. J. Strangeway, W. Magnes, K. J. Trattner, S. A. Fuselier, J. L. Burch, (2016), Observations of Energetic Particle Escape at the Magnetopause: Early Results from the MMS Energetic Ion Spectrometer (EIS), Geophysical Research Letters, 2016GL068689

Measuring the seeds of ion outflow: Auroral sounding rocket observations of low-altitude ion heating and circulation

Journal of Geophysical Research-Space Physics, 2016
P. A. Fernandes, K. A. Lynch, M. Zettergren, D. L. Hampton, T. A. Bekkeng, I. J. Cohen, M. Conde, L. E. Fisher, P. Horak, M. R. Lessard, R. J. Miceli, R. G. Michell, J. Moen, S. P. Powell, (2016), Measuring the seeds of ion outflow: Auroral sounding rocket observations of low-altitude ion heating and circulation, Journal of Geophysical Research-Space Physics, 121, 2, 1587-1607

Rocket-borne measurements of electron temperature and density with the Electron Retarding Potential Analyzer instrument

Journal of Geophysical Research-Space Physics, 2016
I. J. Cohen, M. Widholm, M. R. Lessard, P. Riley, J. Heavisides, J. I. Moen, L. B. N. Clausen, T. A. Bekkeng, (2016), Rocket-borne measurements of electron temperature and density with the Electron Retarding Potential Analyzer instrument, Journal of Geophysical Research-Space Physics, 121, 7, 6774-6782

The "Puck" energetic charged particle detector: Design, heritage, and advancements

Journal of Geophysical Research-Space Physics, 2016
G. Clark, I. Cohen, J. H. Westlake, G. B. Andrews, P. Brandt, R. E. Gold, M. A. Gkioulidou, R. Hacala, D. Haggerty, M. E. Hill, G. C. Ho, S. E. Jaskulek, P. Kollmann, B. H. Mauk, R. L. McNutt, D. G. Mitchell, K. S. Nelson, C. Paranicas, N. Paschalidis, C. E. Schlemm, (2016), The "Puck" energetic charged particle detector: Design, heritage, and advancements, Journal of Geophysical Research-Space Physics, 121, 8, 7900-7913

Energetic electron acceleration observed by MMS in the vicinity of an X-line crossing

Geophysical Research Letters, 2016
A. N. Jaynes, D. L. Turner, F. D. Wilder, A. Osmane, D. N. Baker, J. B. Blake, J. F. Fennell, I. J. Cohen, B. H. Mauk, G. D. Reeves, R. E. Ergun, B. L. Giles, D. J. Gershman, R. B. Torbert, J. L. Burch, (2016), Energetic electron acceleration observed by MMS in the vicinity of an X-line crossing, Geophysical Research Letters, 43, 14, 7356-7363

Energy limits of electron acceleration in the plasma sheet during substorms: A case study with the Magnetospheric Multiscale (MMS) mission

Geophysical Research Letters, 2016
D. L. Turner, J. F. Fennell, J. B. Blake, J. H. Clemmons, B. H. Mauk, I. J. Cohen, A. N. Jaynes, J. V. Craft, F. D. Wilder, D. N. Baker, G. D. Reeves, D. J. Gershman, L. A. Avanov, J. C. Dorelli, B. L. Giles, C. J. Pollock, D. Schmid, R. Nakamura, R. J. Strangeway, C. T. Russell, A. V. Artemyev, A. Runov, V. Angelopoulos, H. E. Spence, R. B. Torbert, J. L. Burch, (2016), Energy limits of electron acceleration in the plasma sheet during substorms: A case study with the Magnetospheric Multiscale (MMS) mission, Geophysical Research Letters, 43, 15, 7785-7794

Inverse energy dispersion of energetic ions observed in the magnetosheath

Geophysical Research Letters, 2016
S. H. Lee, D. G. Sibeck, K. -J. Hwang, Y. Wang, M. V. D. Silveira, M. -C. Fok, B. H. Mauk, I. J. Cohen, J. M. Ruohoniemi, N. Kitamura, J. L. Burch, B. L. Giles, R. B. Torbert, C. T. Russell, M. Lester, (2016), Inverse energy dispersion of energetic ions observed in the magnetosheath, Geophysical Research Letters, 43, 14, 7338-7347

Microinjections observed by MMS FEEPS in the dusk to midnight region

Geophysical Research Letters, 2016
J. F. Fennell, D. L. Turner, C. L. Lemon, J. B. Blake, J. H. Clemmons, B. H. Mauk, A. N. Jaynes, I. J. Cohen, J. H. Westlake, D. N. Baker, J. V. Craft, H. E. Spence, G. D. Reeves, R. B. Torbert, J. L. Burch, B. L. Giles, W. R. Paterson, R. J. Strangeway, (2016), Microinjections observed by MMS FEEPS in the dusk to midnight region, Geophysical Research Letters, 43, 12, 6078-6086

Multispacecraft analysis of dipolarization fronts and associated whistler wave emissions using MMS data

Geophysical Research Letters, 2016
H. Breuillard, O. Le Contel, A. Retino, A. Chasapis, T. Chust, L. Mirioni, D. B. Graham, F. D. Wilder, I. Cohen, A. Vaivads, Yu V. Khotyaintsev, P. -A. Lindqvist, G. T. Marklund, J. L. Burch, R. B. Torbert, R. E. Ergun, K. A. Goodrich, J. Macri, J. Needell, M. Chutter, D. Rau, I. Dors, C. T. Russell, W. Magnes, R. J. Strangeway, K. R. Bromund, F. Plaschke, D. Fischer, H. K. Leinweber, B. J. Anderson, G. Le, J. A. Slavin, E. L. Kepko, W. Baumjohann, B. Mauk, S. A. Fuselier, R. Nakamura, (2016), Multispacecraft analysis of dipolarization fronts and associated whistler wave emissions using MMS data, Geophysical Research Letters, 43, 14, 7279-7286

Transient, small-scale field-aligned currents in the plasma sheet boundary layer during storm-time substorms

Geophysical Research Letters, 2016
R. Nakamura, V. A. Sergeev, W. Baumjohann, F. Plaschke, W. Magnes, D. Fischer, A. Varsani, D. Schmid, T. K. M. Nakamura, C. T. Russell, R. J. Strangeway, H. K. Leinweber, G. Le, K. R. Bromund, C. J. Pollock, B. J. Giles, J. C. Dorelli, D. J. Gershman, W. Paterson, L. A. Avanov, S. A. Fuselier, K. Genestreti, J. L. Burch, R. B. Torbert, M. Chutter, M. R. Argall, B. J. Anderson, P. A. Lindqvist, G. T. Marklund, Y. V. Khotyaintsev, B. Mauk, I. Cohen, D. N. Baker, A. Jaynes, R. E. Ergun, H. J. Singer, J. A. Slavin, L. Kepko, T. E. Moore, B. Lavraud, V. Coffey, Y. Saito, (2016), Transient, small-scale field-aligned currents in the plasma sheet boundary layer during storm-time substorms, Geophysical Research Letters, 2016GL068768

The permeability of the magnetopause to a multispecies substorm injection of energetic particles

Geophysical Research Letters, 2016
J. H. Westlake, I. J. Cohen, B. H. Mauk, B. J. Anderson, D. G. Mitchell, M. Gkioulidou, B. M. Walsh, L. J. Lanzerotti, R. J. Strangeway, C. T. Russell, (2016), The permeability of the magnetopause to a multispecies substorm injection of energetic particles, Geophysical Research Letters, 43, 18, 9453-9460

The substructure of a flux transfer event observed by the MMS spacecraft

Geophysical Research Letters, 2016
K. -J. Hwang, D. G. Sibeck, B. L. Giles, C. J. Pollock, D. Gershman, L. Avanov, W. R. Paterson, J. C. Dorelli, R. E. Ergun, C. T. Russell, R. J. Strangeway, B. Mauk, I. J. Cohen, R. B. Torbert, J. L. Burch, (2016), The substructure of a flux transfer event observed by the MMS spacecraft, Geophysical Research Letters, 43, 18, 9434-9443

Ion upflow dependence on ionospheric density and solar photoionization

Journal of Geophysical Research-Space Physics, 2015
I. J. Cohen, M. R. Lessard, R. H. Varney, K. Oksavik, M. Zettergren, K. A. Lynch, (2015), Ion upflow dependence on ionospheric density and solar photoionization, Journal of Geophysical Research-Space Physics, 120, 11, 10039-10052

Auroral Current and Electrodynamics Structure (ACES) observations of ionospheric feedback in the Alfven resonator and model responses

Journal of Geophysical Research-Space Physics, 2013
I. J. Cohen, M. R. Lessard, S. R. Kaeppler, S. R. Bounds, C. A. Kletzing, A. V. Streltsov, J. W. LaBelle, M. P. Dombrowski, S. L. Jones, R. F. Pfaff, D. E. Rowland, B. J. Anderson, H. Korth, J. W. Gjerloev, (2013), Auroral Current and Electrodynamics Structure (ACES) observations of ionospheric feedback in the Alfven resonator and model responses, Journal of Geophysical Research-Space Physics, 118, 6, 3288-3296

Modeling of Jupiter's auroral curtain and upper atmospheric thermal structure

Journal of Geophysical Research-Space Physics, 2011
I. J. Cohen, J. T. Clarke, (2011), Modeling of Jupiter's auroral curtain and upper atmospheric thermal structure, Journal of Geophysical Research-Space Physics, 116