Associate Professor
- Location
- Room 417
- Phone numbers
- 9007 (Office)
64 3 479 9007 (Office Direct Dial) - jonathan.squire@otago.ac.nz
- Research Group
- https://apf.physics.otago.ac.nz
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.
Publications
Wyper, P. F., Squire, J., Pariat, E., Agapitov, O. V., Drake, J. F., Magyar, N., … Tripathi, D. (2026). Magnetic switchback formation: A review of proposed mechanisms. Space Science Reviews, 222, 43. doi: 10.1007/s11214-026-01296-5 Journal - Research Article
Abbas, K., & Squire, J. (2026). The influence of Parker spiral on the reflection-driven turbulence. Journal of Plasma Physics, 92(2), e55. doi: 10.1017/S0022377826101640 Journal - Research Article
Bowen, T. A., Ervin, T., Mallet, A., Chandran, B. D. G., Sioulas, N., Isenberg, P. A., … Squire, J., … Pezzi, O. (2025). Stochastic heating in the sub-Alfvénic solar wind. Physical Review Letters, 135, 255201. doi: 10.1103/rxd8-22m9 Journal - Research Article
Bott, A. F. A., Kunz, M. W., Quataert, E., Squire, J., & Arzamasskiy, L. (2025). Thermodynamics and collisionality in firehose-susceptible high-β plasmas. Journal of Plasma Physics, 91, E136. doi: 10.1017/S0022377825100731 Journal - Research Article
Adkins, T., Meyrand, R., & Squire, J. (2025). Turbulent heating in collisionless low-beta plasmas: Imbalance, Landau damping, and electron-ion energy partition. Astrophysical Journal, 990, 138. doi: 10.3847/1538-4357/ade9b0 Journal - Research Article
2026
Journal - Research Article
Wyper, P. F., Squire, J., Pariat, E., Agapitov, O. V., Drake, J. F., Magyar, N., … Tripathi, D. (2026). Magnetic switchback formation: A review of proposed mechanisms. Space Science Reviews, 222, 43. doi: 10.1007/s11214-026-01296-5
Abbas, K., & Squire, J. (2026). The influence of Parker spiral on the reflection-driven turbulence. Journal of Plasma Physics, 92(2), e55. doi: 10.1017/S0022377826101640
2025
Journal - Research Article
Bowen, T. A., Ervin, T., Mallet, A., Chandran, B. D. G., Sioulas, N., Isenberg, P. A., … Squire, J., … Pezzi, O. (2025). Stochastic heating in the sub-Alfvénic solar wind. Physical Review Letters, 135, 255201. doi: 10.1103/rxd8-22m9
Bott, A. F. A., Kunz, M. W., Quataert, E., Squire, J., & Arzamasskiy, L. (2025). Thermodynamics and collisionality in firehose-susceptible high-β plasmas. Journal of Plasma Physics, 91, E136. doi: 10.1017/S0022377825100731
Adkins, T., Meyrand, R., & Squire, J. (2025). Turbulent heating in collisionless low-beta plasmas: Imbalance, Landau damping, and electron-ion energy partition. Astrophysical Journal, 990, 138. doi: 10.3847/1538-4357/ade9b0
McIntyre, J. R., Chen, C. H. K., Squire, J., Meyrand, R., & Simon, P. A. (2025). Evidence for the helicity barrier from measurements of the turbulence transition range in the solar wind. Physical Review X, 15, 031008. doi: 10.1103/PhysRevX.15.031008
Johnston, Z., Squire, J., & Meyrand, R. (2025). Unified phenomenology and test-particle simulations of ion heating in low-β plasmas. Physical Review Letters, 135(9), 095201. doi: 10.1103/rp85-hhg4
Chandran, B. D. G., Adkins, T., Bale, S. D., David, V., Halekas, J., Klein, K., … Squire, J., & Yerger, E. L. (2025). A two-fluid solar-wind model with intermittent Alfvénic turbulence. Journal of Plasma Physics, 91, E125. doi: 10.1017/s0022377825100640
Bowen, T. A., Mallet, A., Dunn, C. I., Squire, J., Chandran, B. D. G., Meyrand, R., … Sioulas, N. (2025). Formation of magnetic switchbacks via expanding Alfvén waves. Astronomy & Astrophysics, 700, A51. doi: 10.1051/0004-6361/202450220
Squire, J., Quataert, E., & Hopkins, P. F. (2025). Rapid, strongly magnetized accretion in the zero-net- vertical-flux shearing box. The Open Journal of Astrophysics, 8. doi: 10.33232/001c.136467
Solimon, N. H., Hopkins, P. F., & Squire, J. (2025). Dust battery: A novel mechanism for seed magnetic field generation in the early Universe. Astrophysical Journal, 985(1), 55. doi: 10.3847/1538-4357/adcb39
Bowen, T. A., Dunn, C. I., Mallet, A., Squire, J., Badman, S. T., Bale, S. D., … Sioulas, N. (2025). Nonlinear interactions in spherically polarized Alfvénic turbulence. Astrophysical Journal, 985(1), 49. doi: 10.3847/1538-4357/adc569
David, V., Chandran, B. D. G., Meyrand, R., Squire, J., & Yerger, E. L. (2025). Generalized expanding-box formulations of reduced magnetohydrodynamics in the solar wind. Journal of Plasma Physics, 91, E68. doi: 10.1017/S0022377825000145
Meyrand, R., Squire, J., Mallet, A., & Chandran, B. D. G. (2025). Reflection-driven turbulence in the super-Alfvénic solar wind. Journal of Plasma Physics, 91, e29. doi: 10.1017/s0022377824001181
Zhang, M. F., Kunz, M. W., Squire, J., & Klein, K. G. (2025). Extreme heating of minor ions in imbalanced solar-wind turbulence. Astrophysical Journal, 979, 121. doi: 10.3847/1538-4357/ad95fc
2024
Journal - Research Article
Butsky, I. S., Hopkins, P. F., Kempski, P., Ponnada, S. B., Quataert, E., & Squire, J. (2024). Galactic cosmic-ray scattering due to intermittent structures. Monthly Notices of the Royal Astronomical Society, 528, 4245-4254. doi: 10.1093/mnras/stae276
Majeski, S., Kunz, M. W., & Squire, J. (2024). Self-organization in collisionless, high-β turbulence. Journal of Plasma Physics, 90, 535900601. doi: 10.1017/S0022377824001296
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
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
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
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
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, 8, 482-490. doi: 10.1038/s41550-023-02186-4
Conference Contribution - Published proceedings: Abstract
Chandran, B. D. G., Bale, S. D., David, V., Halekas, J. S., Klein, K. G., Kunz, M. W., Meyrand, R., … Squire, J., … Zhang, M. (2024). Using PSP observations to improve solar-wind models through improved treatments of turbulence and ion heating. Proceedings of the American Geophysical Union (AGU) Annual Meeting: What's Next For Science. SH11B-06. [Abstract]
Wyper, P. F., Pariat, E., Squire, J., Touresse, J., & Matteini, L. (2024). Switchback generation from the evolution of Torsional Alfvén waves. Proceedings of the American Geophysical Union (AGU) Annual Meeting: What's Next For Science. SH24A-01. [Abstract]
Bale, S. D., Matteini, L., Squire, J., Badman, S. T., Bowen, T., Chandran, B. D. G., … Mallet, A. (2024). An Alfvén wave dynamo generates magnetic field in the solar wind. Proceedings of the American Geophysical Union (AGU) Annual Meeting: What's Next For Science. SH12A-05. [Abstract]
Johnston, Z., Squire, J., & Meyrand, R. (2024). A unified description of ion heating in low-beta plasma turbulence: Phenomenology and numerical results. Proceedings of the American Geophysical Union (AGU) Annual Meeting: What's Next For Science. SH44B-05. [Abstract]
McIntyre, J., Chen, C. H. K., Squire, J., Meyrand, R., & Simon, P. (2024). Evidence for the helicity barrier from measurements of the turbulence transition range in the solar wind. Proceedings of the American Geophysical Union (AGU) Annual Meeting: What's Next For Science. SH31G-2697. [Abstract]
Squire, J., Meyrand, R., & Kunz, M. W. (2024). Electron-ion heating partition in solar-wind turbulence: The effect of the helicity barrier. Proceedings of the American Geophysical Union (AGU) Annual Meeting: What's Next For Science. SH24A-04. [Abstract]
Zhang, M. F., Yerger, E. L., Kunz, M. W., Squire, J., Meyrand, R., Klein, K. G., & Chandran, B. (2024). Dependence of extreme minor-ion heating on β and imbalance in solar-wind turbulence. Bulletin of the American Physical Society, TO05.00008. Retrieved from https://meetings.aps.org/Meeting/DPP24/
Yerger, E. L., Zhang, M. F., Chandran, B., Kunz, M. W., & Squire, J. (2024). Proton heating in imbalanced Alfvénic turbulence. Bulletin of the American Physical Society, TO05.00007. Retrieved from https://meetings.aps.org/Meeting/DPP24/
Kunz, M. W., Squire, J., & Meyrand, R. (2024). Electron-ion heating partition in imbalanced solar-wind turbulence. Bulletin of the American Physical Society, TO05.00006. Retrieved from https://meetings.aps.org/Meeting/DPP24/
Israeli, B. Y., Moseley, E. R., Bhattacharjee, A., & Squire, J. (2024). Linear and nonlinear theory of resonant drag instabilities in laboratory and astrophysical dusty plasmas. Bulletin of the American Physical Society, GP12.00100. Retrieved from https://meetings.aps.org/Meeting/DPP24/
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
2023
Journal - Research Article
Squire, J., Kunz, M. W., Arzamasskiy, L., Johnston, Z., Quataert, E., & Schekochihin, A. A. (2023). Pressure anisotropy and viscous heating in weakly collisional plasma turbulence. Journal of Plasma Physics, 89, 905890417. doi: 10.1017/S0022377823000727
Raouafi, N. E., Matteini, L., Squire, J., Badman, S. T., Velli, M., Klein, K. G., … Woolley, T. (2023). Parker Solar Probe: Four years of discoveries at solar cycle minimum. Space Science Reviews, 219, 8. doi: 10.1007/s11214-023-00952-4
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
Meyrand, R., Squire, J., Schekochihin, A. A., Dorland, W. D., Quataert, E., Kunz, M. W., & Arzamasskiy, L. A. (2022). Violation of the zeroth law of turbulence through the helicity barrier effect. Bulletin of the American Physical Society, 67(15), JI01.00002. [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., Arzamasskiy, 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.