Associate Professor Jonathan Squire, Our people, Department of Physics

Associate Professor

Photo of Associate Professor Jonathan Squire.

Location: Room 417
Phone numbers: 9007 (Office)
64 3 479 9007 (Office Direct Dial)
Email: jonathan.squire@otago.ac.nz
Research Group: https://apf.physics.otago.ac.nz

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Biography

I carried out my undergraduate studies in physics at the University of Otago before going to Princeton University to join the PhD programme in plasma physics in 2010. After graduating in 2015, I was a postdoctoral fellow in the astronomy department at Caltech, then joined the Otago physics department as a research fellow in late 2018.

My research covers the broad area of astrophysical and geophysical fluid and plasma dynamics. I am most interested in the theory of the basic physics that governs fluids and plasmas: instabilities, turbulence, the generation of magnetic fields, and the behaviour of collisionless plasmas. Such processes control a wide variety of astrophysical and geophysical systems, including the Earth's magnetic field, planet formation in accretion disks, the solar wind and solar cycle, galaxy clusters, and the magnetization of the entire universe. My work involves a mix of analytic theory and large computer simulations, and I keep up a keen interest in developing robust numerical algorithms that allow us to better understand the complex multi-scale physics of plasmas and fluids.

Current teaching

ASTR 101 Introduction to Astronomy
PHSI 331 Quantum, Atomic and Particle Physics

Publications

Adkins, T., Meyrand, R., & Squire, J. (2024). The effects of finite electron inertia on helicity-barrier-mediated turbulence. Journal of Plasma Physics, 90, 905900403. doi: 10.1017/s0022377824000771 Journal - Research Article

Bowen, T. A., Vasko, I. Y., Bale, S. D., Chandran, B. D. G., Chasapis, A., Dudok de Wit, T., … Meyrand, R., … Squire, J. (2024). Extended cyclotron resonant heating of the turbulent solar wind. Astrophysical Journal Letters, 972, L8. doi: 10.3847/2041-8213/ad6b2e Journal - Research Article

Hopkins, P. F., Squire, J., Su, K.-Y., Steinwandel, U. P., Kremer, K., Shi, Y., … Quataert, E. (2024). In fire II: The formation of magnetically-dominated quasar accretion disks from cosmological initial conditions. The Open Journal of Astrophysics, 7. doi: 10.21105/astro.2310.04506 Journal - Research Article

Hopkins, P. F., Squire, J., Quataert, E., Murray, N., Su, K.-Y., Steinwandel, U. P., … Wellons, S. (2024). An analytic model for magnetically-dominated accretion disks. The Open Journal of Astrophysics, 7. doi: 10.21105/astro.2310.04507 Journal - Research Article

Squire, J. (2024). Switchbacks: Nonlinear magnetic waves in the solar wind. Proceedings of the 6th Australasian Conference on Wave Science (KOZWaves). (pp. 22). Retrieved from https://www.otago.ac.nz/news/events/kozwaves-2024-the-6th-australasian-conference-on-wave-science2 Conference Contribution - Published proceedings: Abstract

2024

Journal - Research Article

Bowen, T. A., Bale, S. D., Chandran, B. D. G., Chasapis, A., Chen, C. H. K., Dudok de Wit, T., … Meyrand, R., & Squire, J. (2024). Mediation of collisionless turbulent dissipation through cyclotron resonance. Nature Astronomy. Advance online publication. doi: 10.1038/s41550-023-02186-4

Conference Contribution - Published proceedings: Abstract

2023

Journal - Research Article

Squire, J., Meyrand, R., & Kunz, M. W. (2023). Electron-ion heating partition in imbalanced solar-wind turbulence. Astrophysical Journal Letters, 957, L30. doi: 10.3847/2041-8213/ad0779

Kempski, P., Quataert, E., & Squire, J. (2023). A new buoyancy instability in galaxy clusters due to streaming cosmic rays. Monthly Notices of the Royal Astronomical Society, 524, 1893-1908. doi: 10.1093/mnras/stad1744

Majeski, S., Kunz, M. W., & Squire, J. (2023). Microphysically modified magnetosonic modes in collisionless, high-β plasmas. Journal of Plasma Physics, 89, 905890303. doi: 10.1017/S0022377823000429

Arzamasskiy, L., Kunz, M. W., Squire, J., Quataert, E., & Schekochihin, A. A. (2023). Kinetic turbulence in collisionless high-β plasmas. Physical Review X, 13(2), 021014. doi: 10.1103/PhysRevX.13.021014

Journal - Research Other

Dorfman, S., Lichko, E., Olson, J., Juno, J., Kostadinova, E., Schaffner, D., … Squire, J., … Meyrand, R., … Preisser, L. (2023). Next generation machine to study heliophysics in the laboratory [Whitepaper #099]. Bulletin of the American Astronomical Society, 55(3). doi: 10.3847/25c2cfeb.ea84c45e

Lichko, E., Endrizzi, D., Juno, J., Olson, J., Dorfman, S., Young, R., … Squire, J., … Meyrand, R., … Kumari, A. (2023). Enabling discoveries in heliospheric science through laboratory plasma experiments [Whitepaper #236]. Bulletin of the American Astronomical Society, 55(3). doi: 10.3847/25c2cfeb.c2b0c4e5

Conference Contribution - Published proceedings: Full paper

Bowen, T. A., Chandran, B. D. G., Klein, K. G., Mallet, A., Bale, S. D., Squire, J., & Verniero, J. (2023). Data-driven representations of ion-kinetic distribution functions. Proceedings of the 35th General Assembly and Scientific Symposium of the International Union of Radio Science (URSI GASS). IEEE. doi: 10.23919/URSIGASS57860.2023.10265538

Conference Contribution - Published proceedings: Abstract

Bowen, T., Bale, S. D., Chandran, B. D. G., Chasapis, A., Chen, C. H. K., Dudok De Wit, T., … Meyrand, R., & Squire, J. (2023). Mediation of collisionless turbulent dissipation through cyclotron resonance [Invited]. Proceedings of the American Geophysical Union (AGU) Fall Meeting: Wide. Open. Science. SH53B-02. Retrieved from https://www.agu.org

Zhang, M., Kunz, M. W., Squire, J., & Meyrand, R. (2023). Enhanced heating of solar-wind minor ions in simulations of imbalanced, Alfvénic turbulence. Proceedings of the American Geophysical Union (AGU) Fall Meeting: Wide. Open. Science. SH54B-06. Retrieved from https://www.agu.org

2022

Journal - Research Article

Johnston, Z., Squire, J., Mallet, A., & Meyrand, R. (2022). On the properties of Alfvénic switchbacks in the expanding solar wind: Three-dimensional numerical simulations. Physics of Plasmas, 29, 072902. doi: 10.1063/5.0097983

Hopkins, P. F., Squire, J., Butsky, I. S., & Ji, S. (2022). Standard self-confinement and extrinsic turbulence models for cosmic ray transport are fundamentally incompatible with observations. Monthly Notices of the Royal Astronomical Society, 517, 5413-5448. doi: 10.1093/mnras/stac2909

Steinwandel, U. P., Kaurov, A. A., Hopkins, P. F., & Squire, J. (2022). On the optical properties of resonant drag instabilities: Variability of asymptotic giant branch and R Coronae Borealis stars. Monthly Notices of the Royal Astronomical Society, 515, 4797-4809. doi: 10.1093/mnras/stac2035

Bowen, T. A., Chandran, B. D. G., Squire, J., Bale, S. D., Duan, D., Klein, K. G., … Meyrand, R., … Woodham, L. D. (2022). In situ signature of cyclotron resonant heating in the solar wind. Physical Review Letters, 129, 165101. doi: 10.1103/PhysRevLett.129.165101

Coburn, J. T., Chen, C. H. K., & Squire, J. (2022). A measurement of the effective mean free path of solar wind protons. Journal of Plasma Physics, 88(5), 175880502. doi: 10.1017/S0022377822000836

Skoutnev, V., Squire, J., & Bhattacharjee, A. (2022). On large-scale dynamos with stable stratification and the application to stellar radiative zones. Monthly Notices of the Royal Astronomical Society, 517, 526-542. doi: 10.1093/mnras/stac2676

Ji, Q., Squire, J., & Hopkins, P. F. (2022). Numerical study of cosmic ray confinement through dust resonant drag instabilities. Monthly Notices of the Royal Astronomical Society, 513(1), 282-295. doi: 10.1093/mnras/stac895

Squire, J., Meyrand, R., Kunz, M. W., Arzamasskiy, L., Schekochihin, A. A., & Quataert, E. (2022). High-frequency heating of the solar wind triggered by low-frequency turbulence. Nature Astronomy, 6, 715-723. doi: 10.1038/s41550-022-01624-z

Squire, J., Moroianu, S., & Hopkins, P. F. (2022). The acoustic resonant drag instability with a spectrum of grain sizes. Monthly Notices of the Royal Astronomical Society, 510, 110-130. doi: 10.1093/mnras/stab3377

Hopkins, P. F., Squire, J., & Butsky, I. S. (2022). A consistent reduced-speed-of-light formulation of cosmic ray transport valid in weak- and strong-scattering regimes. Monthly Notices of the Royal Astronomical Society, 509, 3779-3797. doi: 10.1093/mnras/stab2635

Conference Contribution - Published proceedings: Abstract

Squire, J. (2022). Weakly collisional heating and turbulence in astrophysical plasmas [Thomas H Stix Award]. Bulletin of the American Physical Society, 67(15), JI01.00006. [Abstract]

2021

Journal - Research Article

Bott, A. F. A., Arzamasskiy, L., Kunz, M. W., Quataert, E., & Squire, J. (2021). Adaptive critical balance and firehose instability in an expanding, turbulent, collisionless plasma. Astrophysical Journal Letters, 922(2), L35. doi: 10.3847/2041-8213/ac37c2

Mallet, A., Squire, J., Chandran, B. D. G., Bowen, T., & Bale, S. D. (2021). Evolution of large-amplitude Alfvén waves and generation of switchbacks in the expanding solar wind. Astrophysical Journal, 918, 62. doi: 10.3847/1538-4357/ac0c12

Meyrand, R. P., Squire, J., Schekochihin, A. A., & Dorland, W. (2021). On the violation of the zeroth law of turbulence in space plasmas. Journal of Plasma Physics, 87, 535870301. doi: 10.1017/S0022377821000489

Hopkins, P. F., Chan, T. K., Squire, J., Quataert, E., Ji, S., Kereš, D., & Faucher-Giguère, C.-A. (2021). Effects of different cosmic ray transport models on galaxy formation. Monthly Notices of the Royal Astronomical Society, 501, 3663-3669. doi: 10.1093/mnras/staa3692

Skoutnev, V., Squire, J., & Bhattacharjee, A. (2021). Small-scale dynamo in stably stratified turbulence. Astrophysical Journal, 906, 61. doi: 10.3847/1538-4357/abc8ee

Conference Contribution - Published proceedings: Abstract

Squire, J., Haines, E., & Blakie, B. (2021). Otago Scholarship Physics on Facebook: Weekly questions for NZQA scholarship physics. Proceedings of the New Zealand Institute of Physics (NZIP) & Physikos Conference. Retrieved from https://confer.eventsair.com/nzip2021/

Squire, J., Muir, P., & Blakie, B. (2021). First-year physics and high school outreach at Otago. Proceedings of the New Zealand Institute of Physics (NZIP) & Physikos Conference. Retrieved from https://confer.eventsair.com/nzip2021/

Coburn, J., Chen, C. H. K., & Squire, J. (2021). Measurement of the effective mean-free-path of the solar wind protons. Proceedings of the American Geophysical Union (AGU) Fall Meeting. SH25A-2072. Retrieved from https://www.agu.org/Fall-Meeting

Bale, S. D., Desai, M. I., Halekas, J. S., Horbury, T. S., McManus, M., Panasenco, O., … Squire, J., … Woolley, T. (2021). A solar source of Alfvenic magnetic field switchbacks: In situ remnants of magnetic funnels on supergranulation scales [Invited]. Proceedings of the American Geophysical Union (AGU) Fall Meeting. SH33B-04. Retrieved from https://www.agu.org/Fall-Meeting

Skoutnev, V., Bhattacharjee, A., & Squire, J. (2021). Small-scale dynamo in the stably stratified turbulence of the solar tachocline. Proceedings of the American Geophysical Union (AGU) Fall Meeting. SH53C-08. Retrieved from https://www.agu.org/Fall-Meeting

Bowen, T., Mallet, A., McManus, M., Squire, J., Matteini, L., Stawarz, J. E., … Chen, C. H. K. (2021). Statistical observations of solar wind fluctuations in the de Hoffmann-Teller frame. Proceedings of the American Geophysical Union (AGU) Fall Meeting. SH41A-04. Retrieved from https://www.agu.org/Fall-Meeting

Mallet, A., Squire, J., Chandran, B. D. G., Bowen, T., & Bale, S. D. (2021). Evolution of large-amplitude Alfvén waves and generation of switchbacks in the expanding solar wind. Proceedings of the American Geophysical Union (AGU) Fall Meeting. SH33B-06. Retrieved from https://www.agu.org/Fall-Meeting

Squire, J., Meyrand, R., Kunz, M. W., Arzamasskly, L., Schekochihin, A. A., & Quataert, E. (2021). The helicity barrier: A link between Alfvénic turbulence and ion-cyclotron heating. Proceedings of the American Geophysical Union (AGU) Fall Meeting. SH34B-01. Retrieved from https://www.agu.org/Fall-Meeting

Coburn, J., Chen, C., & Squire, J. (2021). Measurement of the effective mean-free path of the solar wind protons. Proceedings of the European Geosciences Union (EGU) General Assembly. doi: 10.5194/egusphere-egu21-77

2020

Journal - Research Article

Kempski, P., Quataert, E., & Squire, J. (2020). Sound-wave instabilities in dilute plasmas with cosmic rays: Implications for cosmic ray confinement and the Perseus X-ray ripples. Monthly Notices of the Royal Astronomical Society, 493, 5323-5335. doi: 10.1093/mnras/staa535

Burby, J. W., & Squire, J. (2020). General formulas for adiabatic invariants in nearly periodic Hamiltonian systems. Journal of Plasma Physics, 86, 835860601. doi: 10.1017/S002237782000080X

Squire, J., & Hopkins, P. F. (2020). Physical models of streaming instabilities in protoplanetary discs. Monthly Notices of the Royal Astronomical Society, 498, 1239-1251. doi: 10.1093/mnras/staa2311

Hopkins, P. F., Squire, J., & Seligman, D. (2020). Simulating diverse instabilities of dust in magnetized gas. Monthly Notices of the Royal Astronomical Society, 496, 2123-2154. doi: 10.1093/mnras/staa1046

Squire, J., Chandran, B. D. G., & Meyrand, R. (2020). In-situ switchback formation in the expanding solar wind. Astrophysical Journal Letters, 891(1), L2. doi: 10.3847/2041-8213/ab74e1

Li, Z., Hopkins, P. F., Squire, J., & Hummels, C. (2020). On the survival of cool clouds in the circumgalactic medium. Monthly Notices of the Royal Astronomical Society, 492(2), 1841-1854. doi: 10.1093/mnras/stz3567

Conference Contribution - Published proceedings: Abstract

Meyrand, R., Squire, J., Dorland, W., & Schekochihin, A. A. (2020). The "helicity plug": Halting nonlinear energy transfer from MHD to kinetic scales in plasma turbulence. Proceedings of the American Geophysical Union (AGU) Fall Meeting. SH022-05. Retrieved from https://www.agu.org

Squire, J., Chandran, B. D. G., & Meyrand, R. (2020). In-situ switchback formation in the expanding solar wind. Proceedings of the American Geophysical Union (AGU) Fall Meeting. SH029-0017. Retrieved from https://www.agu.org

Mallett, A., Chandran, B. D. G., Squire, J., Meyrand, R., & Bowen, T. A. (2020). In situ formation of switchbacks from finite-amplitude Alfvén waves. Proceedings of the American Geophysical Union (AGU) Fall Meeting. SH033-07. Retrieved from https://www.agu.org

Working Paper; Discussion Paper; Technical Report

Kunz, M. W., Squire, J., Schekochihin, A. A., & Quataert, E. (2020). Self-sustaining sound in collisionless, high-β plasma. arXiv. Retrieved from https://arxiv.org/abs/2006.08940

Burby, J. W., & Squire, J. (2020). General formulas for adiabatic invariants in nearly-periodic Hamiltonian systems. arXiv. Retrieved from https://arxiv.org/abs/2005.00634

Hopkins, P. F., Chan, T. K., Squire, J., Quataert, E., Ji, S., Kereš, D., & Faucher-Giguère, C.-A. (2020). Effects of different cosmic ray transport models on galaxy formation. arXiv. Retrieved from https://arxiv.org/abs/2004.02897

St-Onge, D. A., Kunz, M. W., Squire, J., & Schekochihin, A. A. (2020). Fluctuation dynamo in a weakly collisional plasma. arXiv. Retrieved from https://arxiv.org/abs/2003.09760

Squire, J., & Hopkins, P. F. (2020). Physical models of streaming instabilities in protoplanetary disks. arXiv. Retrieved from https://arxiv.org/abs/2003.01738

Hopkins, P. F., Squire, J., Chan, T. K., Quataert, E., Ji, S., Kereš, S., & Faucher-Giguère, C.-A. (2020). Testing physical models for cosmic ray transport coefficients on galactic scales: Self-confinement and extrinsic turbulence at GeV energies. arXiv. Retrieved from https://arxiv.org/abs/2002.06211

2019

Journal - Research Article

Moseley, E. R., Squire, J., & Hopkins, P. F. (2019). Non-linear evolution of instabilities between dust and sound waves. Monthly Notices of the Royal Astronomical Society, 489, 325-338. doi: 10.1093/mnras/stz2128

Squire, J., Schekochihin, A. A., Quataert, E., & Kunz, M. W. (2019). Magneto-immutable turbulence in weakly collisional plasmas. Journal of Plasma Physics, 85(1), 905850114. doi: 10.1017/s0022377819000114

Kempski, P., Quataert, E., Squire, J., & Kunz, M. W. (2019). Shearing-box simulations of MRI-driven turbulence in weakly collisional accretion discs. Monthly Notices of the Royal Astronomical Society, 486(3), 4013-4029. doi: 10.1093/mnras/stz1111

Seligman, D., Hopkins, P. F., & Squire, J. (2019). Non-linear evolution of the resonant drag instability in magnetized gas. Monthly Notices of the Royal Astronomical Society, 485(3), 3991-3998. doi: 10.1093/mnras/stz666

White, T. G., Oliver, M. T., Mabey, P., Kühn-Kauffeldt, M., Bott, A. F. A., Döhl, L. N. K., … Squire, J., … Gregori, G. (2019). Supersonic plasma turbulence in the laboratory. Nature Communications, 10, 1758. doi: 10.1038/s41467-019-09498-y

Burin, M. J., Caspary, K. J., Edlund, E. M., Ezeta, R., Gilson, E. P., Ji, H., … Squire, J., & Tynan, G. R. (2019). Turbulence and jet-driven zonal flows: Secondary circulation in rotating fluids due to asymmetric forcing. Physical Review E: Statistical, Nonlinear, & Soft Matter Physics, 99(2), 023108. doi: 10.1103/PhysRevE.99.023108

Conference Contribution - Published proceedings: Abstract

Squire, J. (2019). Temperature anisotropy in high-beta plasmas: Instabilities and dynamical effects [Invited]. Proceedings of the American Geophysical Union (AGU) Fall Meeting. SH44A-02. Retrieved from https://agu.confex.com/

Skoutnev, V., Squire, J., & Bhattacharjee, A. (2019). The magnetic shear current effect in the solar dynamo. Bulletin of the American Physical Society, CP10.00026. [Abstract]

Kunz, M., Arzamasskiy, L., Quataert, E., Squire, J., & Schekochihin, A. (2019). Magneto-kinetic turbulence and particle heating in collisionless, high-beta plasmas. Bulletin of the American Physical Society, 64(11), NM8.00005. [Abstract]

Squire, J. (2019). The interesting fluid dynamics of planet formation. Proceedings of the 7th NZ Fluid Mechanics (FiNZ) Conference. (pp. 20). Retrieved from https://www.maths.otago.ac.nz/conferences/finz2019

Working Paper; Discussion Paper; Technical Report

Kempski, P., Quataert, E., & Squire, J. (2019). Sound-wave instabilities in dilute plasmas with cosmic rays: Implications for cosmic-ray confinement and the Perseus X-ray ripples. arXiv. Retrieved from https://arxiv.org/abs/1911.06328

Li, Z., Hopkins, P. F., Squire, J., & Hummels, C. (2019). On the survival of cool clouds in the circum-galactic medium. arXiv. Retrieved from https://arxiv.org/abs/1909.02632

Hopkins, P. F., Squire, J., & Seligman, D. (2019). Simulating the diverse instabilities of dust in magnetized gas. arXiv. Retrieved from https://arxiv.org/abs/1904.11494

Kunz, M. W., Squire, J., Balbus, S. A., Bale, S. D., Chen, C. H. K., Churazov, E., … Zweibel, E. G. (2019). [Plasma 2020 Decadal] The material properties of weakly collisional, high-β plasmas. arXiv. Retrieved from https://arxiv.org/abs/1903.04080

Kempski, P., Quataert, E., Squire, J., & Kunz, M. W. (2019). Shearing-box simulations of MRI-driven turbulence in weakly collisional accretion discs. arXiv. Retrieved from https://arxiv.org/abs/1901.04504

2018

Journal - Research Article

Squire, J., & Hopkins, P. F. (2018). Resonant drag instabilities in protoplanetary discs: The streaming instability and new, faster growing instabilities. Monthly Notices of the Royal Astronomical Society, 477(4), 5011-5040. doi: 10.1093/mnras/sty854

Hopkins, P. F., & Squire, J. (2018). Ubiquitous instabilities of dust moving in magnetized gas. Monthly Notices of the Royal Astronomical Society, 479(4), 4681-4719. doi: 10.1093/mnras/sty1604

Squire, J., & Hopkins, P. F. (2018). Resonant drag instability of grains streaming in fluids. Astrophysical Journal Letters, 856(1), L15. doi: 10.3847/2041-8213/aab54d

Hopkins, P. F., & Squire, J. (2018). The resonant drag instability (RDI): Acoustic modes. Monthly Notices of the Royal Astronomical Society, 480(2), 2813-2838. doi: 10.1093/mnras/sty1982

2017

Journal - Research Article

Squire, J., Quataert, E., & Kunz, M. W. (2017). Pressure-anisotropy-induced nonlinearities in the kinetic magnetorotational instability. Journal of Plasma Physics, 83(6), 905830613. doi: 10.1017/S0022377817000940

Colbrook, M. J., Ma, X., Hopkins, P. F., & Squire, J. (2017). Scaling laws of passive-scalar diffusion in the interstellar medium. Monthly Notices of the Royal Astronomical Society, 467(2), 2421-2429. doi: 10.1093/mnras/stx261

Squire, J., Kunz, M. W., Quataert, E., & Schekochihin, A. A. (2017). Kinetic simulations of the interruption of large-amplitude shear-Alfvén waves in a high-β plasma. Physical Review Letters, 119(15), 155101. doi: 10.1103/PhysRevLett.119.155101

Lee, H., Hopkins, P. F., & Squire, J. (2017). The dynamics of charged dust in magnetized molecular clouds. Monthly Notices of the Royal Astronomical Society, 469(3), 3532-3540. doi: 10.1093/mnras/stx1097

Squire, J., & Hopkins, P. F. (2017). The distribution of density in supersonic turbulence. Monthly Notices of the Royal Astronomical Society, 471(3), 3753-3767. doi: 10.1093/MNRAS/STX1817

Squire, J., Schekochihin, A. A., & Quataert, E. (2017). Amplitude limits and nonlinear damping of shear-Alfvén waves in high-beta low-collisionality plasmas. New Journal of Physics, 19(5), 055005. doi: 10.1088/1367-2630/aa6bb1

2016

Journal - Research Article

Squire, J., Quataert, E., & Schekochihin, A. A. (2016). A stringent limit on the amplitude of Alfvénic perturbations in high-beta low-collisionality plasmas. Astrophysical Journal Letters, 830(2), L25. doi: 10.3847/2041-8205/830/2/L25

Squire, J., & Bhattacharjee, A. (2016). The magnetic shear-current effect: Generation of large-scale magnetic fields by the small-scale dynamo. Journal of Plasma Physics, 82(2), 535820201. doi: 10.1017/S0022377816000258

2015

Journal - Research Article

Squire, J., & Bhattacharjee, A. (2015). Statistical simulation of the magnetorotational dynamo. Physical Review Letters, 114(8), 085002. doi: 10.1103/PhysRevLett.114.085002

Squire, J., & Bhattacharjee, A. (2015). Generation of large-scale magnetic fields by small-scale dynamo in shear flows. Physical Review Letters, 115(17), 175003. doi: 10.1103/PhysRevLett.115.175003

Squire, J., & Bhattacharjee, A. (2015). Electromotive force due to magnetohydrodynamic fluctuations in sheared rotating turbulence. Physical Review E: Statistical, Nonlinear, & Soft Matter Physics, 92(5), 053101 . doi: 10.1103/PhysRevE.92.053101

Squire, J., & Bhattacharjee, A. (2015). Coherent nonhelical shear dynamos driven by magnetic fluctuations at low Reynolds numbers. Astrophysical Journal, 813(1), 52. doi: 10.1088/0004-637X/813/1/52

2014

Journal - Research Article

Squire, J., Burby, J., & Qin, H. (2014). VEST: Abstract vector calculus simplification in Mathematica. Computer Physics Communications, 185(1), 128-135. doi: 10.1016/j.cpc.2013.08.021

Squire, J., & Bhattacharjee, A. (2014). Nonmodal growth of the magnetorotational instability. Physical Review Letters, 113(2), 025006. doi: 10.1103/PhysRevLett.113.025006

Squire, J., & Bhattacharjee, A. (2014). Magnetorotational instability: Nonmodal growth and the relationship of global modes to the shearing box. Astrophysical Journal, 797(1), 67. doi: 10.1088/0004-637X/797/1/67

Journal - Research Other

Parra, F. I., Calvo, I., Burby, J. W., Squire, J., & Qin, H. (2014). Equivalence of two independent calculations of the higher order guiding center Lagrangian (Brief communication). Physics of Plasmas, 21(10), 104506. doi: 10.1063/1.4897317

2013

Journal - Research Article

Burby, J. W., Squire, J., & Qin, H. (2013). Automation of the guiding center expansion. Physics of Plasmas, 20(7), 072105. doi: 10.1063/1.4813247

Squire, J., Qin, H., Tang, W. M., & Chandre, C. (2013). The Hamiltonian structure and Euler-Poincaré formulation of the Vlasov-Maxwell and gyrokinetic systems. Physics of Plasmas, 20(2), 022501. doi: 10.1063/1.4791664

Conference Contribution - Published proceedings: Full paper

Schmitt, J. C., Abrams, T., Baylor, L. R., Berzak Hopkins, L., Biewer, T., Bohler, D., … Squire, J., … Zakharov, L. (2013). Results and future plans of the Lithium Tokamak eXperiment (LTX). Journal of Nuclear Materials, 438(Suppl.), (pp. S1096-S1099). doi: 10.1016/j.jnucmat.2013.01.241

2012

Journal - Research Article

Squire, J., Qin, H., & Tang, W. M. (2012). Gauge properties of the guiding center variational symplectic integrator. Physics of Plasmas, 19(5), 052501. doi: 10.1063/1.4714608

Qin, H., Liu, W., Li, H., & Squire, J. (2012). Woltjer-Taylor state without Taylor's conjecture: Plasma relaxation at all wavelengths. Physical Review Letters, 109(23), 235001. doi: 10.1103/PhysRevLett.109.235001

Journal - Research Other

Squire, J., Qin, H., & Tang, W. M. (2012). Geometric integration of the Vlasov-Maxwell system with a variational particle-in-cell scheme (Brief communication). Physics of Plasmas, 19(8), 084501 . doi: 10.1063/1.4742985

2009

Performance

Bellingham, J. (soprano), Dennis, T. (piano), Petersen, T. (violin), & Squire, J. (cello) (2009, 5 August). Department of Music Showcase Series: Haydn in London: Haydn Commemorative Year 1809-2009, Marama Hall, Dunedin, New Zealand.

Court, S. (guitar), McGrath, T. (piano), Petersen, T. (violin), Squire, J. (cello), van Buskirk, J. (piano), & Moore, E. (euphonium) (2009, 20 September). Department of Music Showcase Series: Schemata: Concert of Music by New Zealand Composers, including works by Chris Watson, Peter Adams and Anthony Ritchie, Marama Hall, Dunedin, New Zealand.