Overview

I am currently an Associate Professor in the Centre for Geophysical and Astrophysical Fluid Dynamics. My interests are in Magnetohydrodynamics (MHD), especially in the context of the solar atmosphere. You can see the specific areas I have studied by looking at my publication list.

I work to combine analytic results with simulations and analyse of observations to give a balanced understanding of the dynamics we can observe in the solar atmosphere. I have worked a lot of the beautiful flows, instabilities and waves that can be seen in solar prominences in the observations by the Hinode Satellite. I am also working on how the low ionisation, due to the cool temperatures of many astrophysical systems, changes dynamics in MHD and on more fundamental fluid dynamics problems involving fluid mixing by instabilities. Please see my pulications list for my resent results in these areas.

If you are interested in doing a Ph.D. or a postdoc in any of the above areas please email me directly. For self-funded students I offer specific projects in partially ionised MHD and in turbulent mixing in MHD.

Back to top

Publications

_{Copyright Notice: Any articles made available for download are for personal use only. Any other use requires prior permission of the author and the copyright holder.}

| 2024 | 2023 | 2022 | 2021 | 2020 | 2019 | 2018 | 2017 | 2016 | 2015 | 2014 | 2013 | 2012 | 2011 | 2010 |

2024

• Hillier A. (2024) On the Ambipolar Diffusion Formulation for Ion-neutral drifts in the non-negligible drift velocity limit. [PDF]

2023

• Snow B, Druett M, Hillier A. (2023) Partially-ionised two-fluid shocks with collisional and radiative ionisation and recombination -- multi-level hydrogen model, DOI:10.48550/arxiv.2308.12802.
• Snow B, Druett MK, Hillier A. (2023) Partially ionized two-fluid shocks with collisional and radiative ionization and recombination – multilevel hydrogen model, Monthly Notices of the Royal Astronomical Society, volume 525, no. 3, pages 4717-4734, DOI:10.1093/mnras/stad2585. [PDF]
• Hillier A, Arregui I, Matsumoto T. (2023) Nonlinear wave damping by Kelvin-Helmholtz instability induced turbulence. [PDF]
• Algatheem AM, Gilbert AD, Hillier AS. (2023) Zonostrophic instabilities in magnetohydrodynamic Kolmogorov flow. [PDF]
• Hillier A, Snow B. (2023) Shocks and instabilities in the partially ionised solar atmosphere, Advances in Space Research, volume 71. [PDF]
• Hillier A, Snow B, Arregui I. (2023) The role of cooling induced by mixing in the mass and energy cycles of the solar atmosphere, Monthly Notices of the Royal Astronomical Society, volume 520, no. 2, pages 1738-1747. [PDF]
• Hillier A, Snow B, Arregui I. (2023) The role of cooling induced by mixing in the mass and energy cycles of the solar atmosphere, Monthly Notices of the Royal Astronomical Society, volume 520, no. 2, pages 1738-1747, DOI:10.1093/mnras/stad234. [PDF]
• Hillier A, Takasao S. (2023) Connecting theory of plasmoid-modulated reconnection to observations of solar flares, Experimental Results, volume 3. [PDF]
• Hillier A, Snow B. (2023) Shocks and instabilities in the partially ionised solar atmosphere, Advances in Space Research, volume 71, no. 4, pages 1962-1983, DOI:10.1016/j.asr.2022.08.079.

2022

• Hillier A, Takasao S. (2022) Connecting theory of plasmoid-modulated reconnection to observations of solar flares, Experimental Results, volume 3, DOI:10.1017/exp.2022.23.
• Murtas G, Hillier A, Snow B. (2022) Collisional ionisation and recombination effects on coalescence instability in chromospheric partially ionised plasmas. [PDF]
• Murtas G. (2022) Modelling the partially ionised solar chromosphere.

2021

• Murtas G, Hillier A, Snow B. (2021) Coalescence Instability in Chromospheric Partially Ionised Plasmas, DOI:10.48550/arxiv.2102.01630.
• Snow B, Hillier A. (2021) Stability of two-fluid partially-ionised slow-mode shock fronts, DOI:10.48550/arxiv.2106.04199.
• Snow B, Hillier A, Murtas G, Botha GJJ. (2021) Shock identification and classification in 2D MHD compressible turbulence -- Orszag-Tang vortex, DOI:10.48550/arxiv.2111.02242.
• Snow B, Hillier A, Murtas G, Botha GJJ. (2021) Shock identification and classification in 2D magnetohydrodynamiccompressible turbulence—Orszag–Tang vortex, Experimental Results, volume 2, article no. e35, DOI:10.1017/exp.2021.28. [PDF]
• Tesfaye Desta E, Hillier A, Haile Eritro T. (2021) Dispersion Relations for Waves in Visco-gravitating Anisotropic Magnetoplasmas, Physics of Plasmas, DOI:10.1063/5.0032612.
• Murtas G, Hillier A, Snow B. (2021) Coalescence Instability in Chromospheric Partially Ionised Plasmas, Physics of Plasmas, volume 28, DOI:10.1063/5.0032236. [PDF]
• Zhou Y, Williams RJR, Ramaprabhu P, Groom M, Thornber B, Hillier A, Mostert W, Rollin B, Powell PD, Mahalov A. (2021) Rayleigh-Taylor and Richtmyer-Meshkov instabilities: A journey through scales, Physica D: Nonlinear Phenomena.
• Snow B, Hillier A. (2021) Collisional ionisation, recombination, and ionisation potential in two-fluid slow-mode shocks: Analytical and numerical results, Astronomy and Astrophysics, volume 645, DOI:10.1051/0004-6361/202039667.

2020

• Snow B, Hillier A. (2020) Mode conversion of two-fluid shocks in a partially-ionised, isothermal, stratified atmosphere, DOI:10.48550/arxiv.2004.02550.
• Snow B, Hillier A. (2020) Collisional ionisation, recombination and ionisation potential in two-fluid slow-mode shocks: analytical and numerical results, DOI:10.48550/arxiv.2010.06303.
• Hillier A, Van Doorsselaere T, Karampelas K. (2020) Estimating the energy dissipation {from Kelvin-Helmholtz instability induced} turbulence in oscillating coronal loops}, DOI:10.48550/arxiv.2007.09068.
• Hillier A. (2020) Estimating the energy dissipation from Kelvin-Helmholtz instability induced turbulence in oscillating coronal loops, Letters of the Astrophysical Journal.
• Snow B, Hillier A. (2020) Mode conversion of two-fluid shocks in a partially-ionised, isothermal, stratified atmosphere, ASTRONOMY & ASTROPHYSICS, volume 637, article no. ARTN A97, DOI:10.1051/0004-6361/202037848. [PDF]
• Hillier A. (2020) Self-similar solutions of asymmetric Rayleigh-Taylor mixing, Physics of Fluids, pages n/a-n/a, article no. 015103.

2019

• Snow B, Hillier A. (2019) Intermediate shock substructures within a slow-mode shock occurring in partially ionised plasma, DOI:10.48550/arxiv.1904.12518.
• Hillier A. (2019) Ion-neutral decoupling in the nonlinear Kelvin--Helmholtz instability: Case of field-aligned flow, DOI:10.48550/arxiv.1907.12507.
• Hillier A, Arregui I. (2019) Coronal cooling as a result of mixing by the nonlinear Kelvin--Helmholtz instability, DOI:10.48550/arxiv.1909.11351.
• Singh A, Pucci F, Tenerani A, Shibata K, Hillier A, Velli M. (2019) Dynamic evolution of current sheets, ideal tearing, plasmoid formation and generalized fractal reconnection scaling relations, DOI:10.48550/arxiv.1904.00755.
• Hillier A. (2019) Ideal MHD Instabilities, with a Focus on the Rayleigh–Taylor and Kelvin–Helmholtz Instabilities, Topics in Magnetohydrodynamic Topology, Reconnection and Stability Theory, Springer Nature, 1-36, DOI:10.1007/978-3-030-16343-3_1.
• Al-Janabi K, Antolin P, Baker D, Bellot Rubio L, Bradley L, Brooks DH, Centeno R, Culhane JL, Del Zanna G, Doschek GA. (2019) Achievements of Hinode in the first eleven years, Publications of the Astronomical society of Japan, volume 71, article no. R1, DOI:10.1093/pasj/psz084.
• Hillier A, Arregui I. (2019) Coronal cooling as a result of mixing by the nonlinear Kelvin–Helmholtz instability, The Astrophysical Journal.
• Singh KAP, Pucci F, Tenerani A, Shibata K, Hillier A, Velli M. (2019) Dynamic Evolution of Current Sheets, Ideal Tearing, Plasmoid Formation and Generalized Fractal Reconnection Scaling Relations, ASTROPHYSICAL JOURNAL, volume 881, no. 1, article no. ARTN 52, DOI:10.3847/1538-4357/ab2b99. [PDF]
• Hillier AS. (2019) Ion-neutral decoupling in the nonlinear Kelvin–Helmholtz instability: Case of field-aligned flow, Physics of Plasmas, DOI:10.1063/1.5103248.
• Snow BJ, Hillier A. (2019) Intermediate shock substructures within a slow-mode shock occurring in partially ionised plasma, Astronomy and Astrophysics.

2018

• Hillier A, Polito V. (2018) Observations of the Kelvin-Helmholtz instability driven by dynamic motions in a solar prominence, DOI:10.48550/arxiv.1808.02286.
• Hillier A, Barker A, Arregui I, Latter H. (2018) On Kelvin-Helmholtz and parametric instabilities driven by coronal waves, DOI:10.48550/arxiv.1810.02773.
• Hillier AS, Barker A, Arregui I, Latter H. (2018) On Kelvin–Helmholtz and parametric instabilities driven by coronal waves, Monthly Notices of the Royal Astronomical Society.
• Hillier A, Polito V. (2018) Observations of the Kelvin-Helmholtz instability driven by dynamic motions in a solar prominence, Astrophysical Journal Letters, volume 864, no. 1, article no. l10, DOI:10.3847/2041-8213/aad9a5.

2017

• Carlyle J, Hillier A. (2017) The Non-Linear Growth of the Magnetic Rayleigh-Taylor Instability, DOI:10.48550/arxiv.1707.07987.
• Berger T, Hillier A, Liu W. (2017) Quiescent prominence dynamics observed with the Hinode Solar Optical Telescope . II. Prominence Bubble Boundary Layer Characteristics and the Onset of a Coupled Kelvin-Helmholtz Rayleigh-Taylor Instability, DOI:10.48550/arxiv.1707.05265.
• Anan T, Ichimoto K, Hillier A. (2017) Differences between Doppler velocities of ions and neutral atoms in a solar prominence, DOI:10.48550/arxiv.1703.02132.
• Snow B, Botha GJJ, McLaughlin JA, Hillier A. (2017) Onset of 2D magnetic reconnection in the solar photosphere, chromosphere and corona, DOI:10.48550/arxiv.1711.00683.
• Hillier AS. (2017) The magnetic Rayleigh–Taylor instability in solar prominences, Reviews of Modern Plasma Physics, DOI:10.1007/s41614-017-0013-2.
• Berger T, Hillier AS, Lui W. (2017) Quiescent Prominence Dynamics Observed with the Hinode Solar Optical Telescope. II. Prominence Bubble Boundary Layer Characteristics and the Onset of a Coupled Kelvin–Helmholtz Rayleigh–Taylor Instability, Astrophysical Journal, DOI:10.3847/1538-4357/aa95b6.
• Snow B, Botha GJJ, McLaughlin JA, Hillier AS. (2017) Onset of 2D magnetic reconnection in the solar photosphere, chromosphere and corona, Astronomy and Astrophysics, DOI:10.1051/0004-6361/201731214.
• Carlyle J, Hillier A. (2017) The non-linear growth of the magnetic Rayleigh-Taylor instability, Astronomy and Astrophysics, volume 605, DOI:10.1051/0004-6361/201730802.
• Anan T, Ichimoto K, Hillier A. (2017) Differences between Doppler velocities of ions and neutral atoms in a solar prominence, Astronomy and Astrophysics, volume 601, DOI:10.1051/0004-6361/201629979.
• Hillier A, Matsumoto T, Ichimoto K. (2017) Investigating prominence turbulence with Hinode SOT Dopplergrams, Astronomy and Astrophysics, volume 597, DOI:10.1051/0004-6361/201527766.

2016

• Singh KAP, Hillier A, Isobe H, Shibata K. (2016) Nonlinear Instability and Intermittent Nature of Magnetic Reconnection in Solar Chromosphere, DOI:10.48550/arxiv.1602.01999.
• Hillier A, Matsumoto T, Ichimoto K. (2016) Investigating prominence turbulence with Hinode SOT Dopplergrams, DOI:10.48550/arxiv.1610.08281.
• Hillier A. (2016) On the nature of the magnetic Rayleigh-Taylor instability in Astrophysical Plasma: The case of uniform magnetic field strength, DOI:10.48550/arxiv.1610.08317.
• Hillier A, Takasao S, Nakamura N. (2016) The formation and evolution of reconnection-driven slow-mode shocks in a partially ionised plasma, DOI:10.48550/arxiv.1602.01112.
• Hillier A, Takasao S, Nakamura N. (2016) The formation and evolution of reconnection-driven, slow-mode shocks in a partially ionised plasma, ASTRONOMY & ASTROPHYSICS, volume 591, article no. ARTN A112, DOI:10.1051/0004-6361/201628215.
• Hillier AS. (2016) On the nature of the magnetic Rayleigh-Taylor instability in astrophysical plasma: the case of uniform magnetic field strength, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, volume 462, no. 2, pages 2256-2265, DOI:10.1093/mnras/stw1805. [PDF]

2015

• Singh KAP, Hillier A, Isobe H, Shibata K. (2015) Nonlinear instability and intermittent nature of magnetic reconnection in solar chromosphere, Publications of the Astronomical Society of Japan, volume 67, no. 5, DOI:10.1093/pasj/psv066. [PDF]

2014

• Carlyle J, Williams DR, van Driel-Gesztelyi L, Innes D, Hillier A, Matthews S. (2014) INVESTIGATING THE DYNAMICS AND DENSITY EVOLUTION OF RETURNING PLASMA BLOBS FROM THE 2011 JUNE 7 ERUPTION, The Astrophysical Journal, volume 782, no. 2, DOI:10.1088/0004-637x/782/2/87.
• Candelaresi S, Hillier A, Maehara H, Brandenburg A, Shibata K. (2014) Superflare occurrence and energies on G-, K- and M-type dwarfs, DOI:10.48550/arxiv.1405.1453.
• Carlyle J, Williams DR, van Driel-Gesztelyi L, Innes D, Hillier A, Matthews S. (2014) Investigating the Dynamics and Density Evolution of Returning Plasma Blobs from the 2011 June 7 Eruption, DOI:10.48550/arxiv.1401.4824.
• Hillier A, Hillier R, Tripathi D. (2014) Determination of Prominence Plasma β from the Dynamics of Rising Plumes, Proceedings of the International Astronomical Union, volume 8, no. S300, pages 94-97, DOI:10.1017/s1743921313010806. [PDF]
• Candelaresi S, Hillier A, Maehara H, Brandenburg A, Shibata K. (2014) SUPERFLARE OCCURRENCE AND ENERGIES ON G-, K-, AND M-TYPE DWARFS, The Astrophysical Journal, volume 792, no. 1, pages 67-67, DOI:10.1088/0004-637x/792/1/67. [PDF]
• Morton RJ, Verth G, Hillier A, Erdélyi R. (2014) THE GENERATION AND DAMPING OF PROPAGATING MHD KINK WAVES IN THE SOLAR ATMOSPHERE, The Astrophysical Journal, volume 784, no. 1, pages 29-29, DOI:10.1088/0004-637x/784/1/29. [PDF]

2013

• Hillier A, van Ballegooijen A. (2013) On the Support of Solar Prominence Material by the Dips of a Coronal Flux Tube, DOI:10.48550/arxiv.1303.4130.
• Hillier A, Morton RJ, Erdélyi R. (2013) A statistical study of transverse oscillations in a quiescent prominence, DOI:10.48550/arxiv.1310.8009.
• Morton RJ, Verth G, Hillier A, Erdélyi R. (2013) The generation and damping of propagating MHD kink waves in the solar atmosphere, DOI:10.48550/arxiv.1310.4650.
• Shibata K, Isobe H, Hillier A, Choudhuri AR, Maehara H, Ishii TT, Shibayama T, Notsu S, Notsu Y, Nagao T. (2013) Can Superflares Occur on Our Sun?, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, volume 65, no. 3, article no. ARTN 49, DOI:10.1093/pasj/65.3.49. [PDF]
• Hillier A, Ballegooijen AV. (2013) On the Support of Solar Prominence Material by the Dips of a Coronal Flux Tube, ApJ, volume 766. [PDF]
• Hillier A, Morton RJ, Erdélyi R. (2013) A statistical study of transverse oscillations in a quiescent prominence. [PDF]

2012

• Hillier A, Hillier R, Tripathi D. (2012) Determination of Prominence Plasma Beta from the Dynamics of Rising Plumes, DOI:10.48550/arxiv.1211.0742.
• Shibata K, Isobe H, Hillier A, Choudhuri AR, Maehara H, Ishii TT, Shibayama T, Notsu S, Notsu Y, Nagao T. (2012) Can Superflares Occur on Our Sun?, DOI:10.48550/arxiv.1212.1361.
• Hillier A, Berger T, Isobe H, Shibata K. (2012) NUMERICAL SIMULATIONS OF THE MAGNETIC RAYLEIGH-TAYLOR INSTABILITY IN THE KIPPENHAHN-SCHLUTER PROMINENCE MODEL. I. FORMATION OF UPFLOWS, ASTROPHYSICAL JOURNAL, volume 746, no. 2, article no. ARTN 120, DOI:10.1088/0004-637X/746/2/120. [PDF]
• Hillier A, Hillier R, Tripathi D. (2012) Determination of Prominence Plasma Beta from the Dynamics of Rising Plumes. [PDF]

2011

• Hillier A, Isobe H, Shibata K, Berger T. (2011) Numerical Simulations of the Magnetic Rayleigh-Taylor Instability in the Kippenhahn-Schlüter Prominence Model, DOI:10.48550/arxiv.1106.2613.
• Hillier A, Isobe H, Watanabe H. (2011) Observations of Plasma Blob Ejection from a Quiescent Prominence by Hinode SOT, DOI:10.48550/arxiv.1103.3750.
• Hillier A, Isobe H, Shibata K, Berger T. (2011) NUMERICAL SIMULATIONS OF THE MAGNETIC RAYLEIGH-TAYLOR INSTABILITY IN THE KIPPENHAHN-SCHLUTER PROMINENCE MODEL, ASTROPHYSICAL JOURNAL LETTERS, volume 736, no. 1, article no. ARTN L1, DOI:10.1088/2041-8205/736/1/L1. [PDF]
• Berger T, Testa P, Hillier A, Boerner P, Low BC, Shibata K, Schrijver C, Tarbell T, Title A. (2011) Magneto-thermal convection in solar prominences, NATURE, volume 472, no. 7342, pages 197-200, DOI:10.1038/nature09925. [PDF]
• Hillier A, Isobe H, Watanabe H. (2011) Observations of Plasma Blob Ejection from a Quiescent Prominence by Hinode SOT. [PDF]
• Hillier A, Isobe H, Shibata K, Berger T. (2011) Numerical Simulations of the Magnetic Rayleigh-Taylor Instability in the Kippenhahn-Schlüter Prominence Model. [PDF]

2010

• Hillier A, Shibata K, Isobe H. (2010) Evolution of the Kippenhahn-Schlueter Prominence Model Magnetic Field Under Cowling Resistivity, DOI:10.48550/arxiv.1007.1909.
• Anan T, Kitai R, Kawate T, Matsumoto T, Ichimoto K, Shibata K, Hillier A, Otsuji K, Watanabe H, UeNo S. (2010) Spicule Dynamics over Plage Region, DOI:10.48550/arxiv.1002.2288.
• Anan T, Kitai R, Kawate T, Matsumoto T, Ichimoto K, Shibata K, Hillier A, Otsuji K, Watanabe H, UeNo S. (2010) Spicule Dynamics over a Plage Region, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, volume 62, no. 4, pages 871-877, DOI:10.1093/pasj/62.4.871. [PDF]
• Hillier A, Shibata K, Isobe H. (2010) Evolution of the Kippenhahn-Schlueter Prominence Model Magnetic Field Under Cowling Resistivity. [PDF]

Back to top