Dr Istvan Ballai
School of Mathematical and Physical Sciences
Senior Lecturer in Applied Mathematics
i.ballai@sheffield.ac.uk
+44 114 222 3833
+44 114 222 3833
H9, Hicks Building
Full contact details
Dr Istvan Ballai
School of Mathematical and Physical Sciences
H9
Hicks Building
Hounsfield Road
Sheffield
S3 7RH
School of Mathematical and Physical Sciences
H9
Hicks Building
Hounsfield Road
Sheffield
S3 7RH
- Research interests
-
Dr. Istvan Ballai's main research interest is in linear and nonlinear MagnetoHydroDynamics (MHD) waves occurring in solar and interplanetary plasmas.
Waves can carry energy and momentum; when transferred to inhomogeneous plasmas they can heat or accelerate the plasma therefore MHD waves may play an important role in explaining the observed high temperatures in the solar corona. Waves can transport information about the environment in which they propagate, so they can serve as a perfect tool for plasma diagnostics. In this context I use local and global coronal waves to find average values for magnetic field and transport coefficients in the solar corona.
When the temperature of the plasma is not high enough to ensure a full ionisation, the plasma becomes partially ionised with particles of different species colliding and modifying each other momentum and energy. My research focusses on the properties of linear and nonlinear waves in partially ionised plasmas, as well the stability of dynamical changes occurring in these environments.
- Publications
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All publications
Journal articles
- Driven phase-mixed Alfvén waves in a partially ionized solar plasma. The Astrophysical Journal, 988(1). View this article in WRRO
- 3D magnetohydrodynamic wave propagation and energy transport in a simulated solar vortex. The Astrophysical Journal, 988(1). View this article in WRRO
- Harmonizing sunspot datasets consistency: focusing on SOHO/MDI and SDO/HMI data. Universe, 11(6). View this article in WRRO
- Recovering coherent flow structures in active regions using machine learning. Monthly Notices of the Royal Astronomical Society, 539(3), 2498-2512. View this article in WRRO
- Solar vortex tubes. III. vorticity and energy transport. The Astrophysical Journal, 975(1). View this article in WRRO
- Modeling the effects of a light bridge on properties of magnetohydrodynamic waves in solar pores. The Astrophysical Journal, 975(1). View this article in WRRO
- Changes in turbulent processes caused by atmospheric gravity waves from troposphere. Journal of Atmospheric and Solar-Terrestrial Physics, 265. View this article in WRRO
- Slow body MHD waves in inhomogeneous photospheric waveguides. Universe, 10(8). View this article in WRRO
- Sausage, kink, and fluting magnetohydrodynamic wave modes identified in solar magnetic pores by Solar Orbiter/PHI. Astronomy & Astrophysics, 688. View this article in WRRO
- Parametric resonance of Alfvén waves driven by ionization-recombination waves in the weakly ionized solar atmosphere. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 382(2272).
- Slow body magnetohydrodynamic waves in solar photospheric flux tubes with density inhomogeneity. Monthly Notices of the Royal Astronomical Society, 529(1), 748-760. View this article in WRRO
- Magnetohydrodynamic Poynting flux vortices in the solar atmosphere and their role in concentrating energy. The Astrophysical Journal, 963(1). View this article in WRRO
- Phase mixing of propagating Alfvén waves in a single-fluid partially ionized solar plasma. The Astrophysical Journal, 958(1). View this article in WRRO
- Turbulent dipolarization regions in the Earth’s magnetotail: ion fluxes and magnetic field changes. Frontiers in Astronomy and Space Sciences, 10. View this article in WRRO
- Atmospheric waves disturbances from the solar terminator according to the VLF radio stations data. Advances in Space Research, 72(11), 4825-4835. View this article in WRRO
- The temporal and spatial evolution of magnetohydrodynamic wave modes in sunspots. The Astrophysical Journal, 954(1). View this article in WRRO
- Magnetic energy powers the corona: how we can understand its 3D storage & release. Bulletin of the American Astronomical Society, 55(3). View this article in WRRO
- Novel approach to forecasting photospheric emergence of active regions. The Astrophysical Journal Letters, 948(2).
- PREFACE: Recent progress in the physics of the Sun and heliosphere. Advances in Space Research.
- Comparison of exact and approximate MHD slow body mode solutions in photospheric waveguides. The Astrophysical Journal, 938(1). View this article in WRRO
- Small-scale solar jet formation and their associated waves and instabilities. Advances in Space Research.
- MHD wave modes of solar magnetic flux tubes with the realistic cross-section. EGU General Assembly 2022. View this article in WRRO
- New approach for analyzing dynamical processes on the surface of photospheric vortex tubes. The Astrophysical Journal, 928(1). View this article in WRRO
- Magnetohydrodynamic wave mode identification in circular and elliptical sunspot umbrae : evidence for high-order modes. The Astrophysical Journal, 927(2). View this article in WRRO
- The importance of horizontal Poynting flux in the solar photosphere. The Astrophysical Journal, 927(2). View this article in WRRO
- Waves in weakly ionized solar plasmas. Monthly Notices of the Royal Astronomical Society, 511(4), 5274-5286.
- Approbation of wave dispersion analysis using multispacecraft methods. Bulletin of Taras Shevchenko National University of Kyiv. Astronomy(66), 20-25. View this article in WRRO
- Generation of localised vertical streams in unstable stratified atmosphere. Fluids, 6(12). View this article in WRRO
- Time-dependent properties of sunspot groups. I. Lifetime and asymmetric evolution. Astronomy and Astrophysics, 653.
- Critical science plan for the Daniel K. Inouye solar telescope (DKIST). Solar Physics, 296(4).
- Proper orthogonal and dynamic mode decomposition of sunspot data. Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 379(2190).
- Slow magnetoacoustic waves in gravitationally stratified two-fluid plasmas in strongly ionized limit. Monthly Notices of the Royal Astronomical Society, 501(2), 1940-1950.
- Generation of low-frequency kinetic waves at the footpoints of pre-flare coronal loops. Solar Physics, 295(12). View this article in WRRO
- Diagnostics of plasma ionisation using torsional Alfén waves. Astronomy & Astrophysics, 635.
- Magnetic Rayleigh-Taylor instability at a contact discontinuity with an oblique magnetic field. Astronomy & Astrophysics, 634. View this article in WRRO
- Linear Waves in Partially Ionized Plasmas in Ionization Non-equilibrium. Frontiers in Astronomy and Space Sciences, 6. View this article in WRRO
- Dispersive shock waves in partially ionised plasmas. Advances in Space Research, 63(4), 1472-1482. View this article in WRRO
- Propagation of leaky surface waves on contact magnetohydrodynamic discontinuities in incompressible plasmas. Physics of Plasmas, 25(12). View this article in WRRO
- Propagation of leaky MHD waves at discontinuities with tilted magnetic field. Solar Physics, 293. View this article in WRRO
- Dissipative instabilities in a partially ionised prominence plasma slab. II. The effect of compressibility. Astronomy and Astrophysics, 610.
- Rayleigh-Taylor instabilities with sheared magnetic fields in partially ionised plasmas. Astronomy and Astrophysics, 609. View this article in WRRO
- Dissipative instability in a partially ionised prominence plasma slab. Astronomy & Astrophysics.
- Statistical study of spatio-temporal distribution of precursor solar flares associated with major flares. Monthly Notices of the Royal Astronomical Society, 459(4), 3532-3539. View this article in WRRO
- Dissipative instability in partially ionised prominence plasmas. Astronomy and Astrophysics, 577. View this article in WRRO
- Statistical relationship between the succeeding solar flares detected by
the RHESSI satellite. MNRAS, 441, 1157-1165.
- Three-dimensional numerical simulation of magnetohydrodynamic-gravity
waves and vortices in the solar atmosphere.
- The P1/P2 period ratio for kink oscillations of an asymmetrical coronal loop. Astronomische Nachrichten, 334(9), 948-951.
- Sausage Mode Propagation in a Thick Magnetic Flux Tube. 2013SoPh..tmp..229P.
- Transverse kink oscillations of expanding coronal loops.
- The effect of the environment on the P1/P2 period ratio for kink
oscillations of coronal loops.
- TRACE Observations of Driven Loop Oscillations.
- Magnetoacoustic surface gravity waves at a spherical interface. ASTRON ASTROPHYS, 527.
- Nonlinear effects in resonant layers in solar and space plasmas.
- The dynamical solar atmosphere. Journal of Physics Conference Series, 218(1).
- Resonant Absorption of Fast Magnetoacoustic Waves due to Coupling into
the Slow and Alfven Continua in the Solar Atmosphere. Solar Physics 06/2010.
- The effect of longitudinal flow on resonantly damped kink oscillations.
- Mean shear flows generated by nonlinear resonant Alfveacuten waves. PHYS PLASMAS, 16(7).
- Nonlinear resonant absorption of fast magnetoacoustic waves in strongly anisotropic and dispersive plasmas. PHYS PLASMAS, 16(4).
- On the validity of nonlinear Alfven resonance in space plasmas. ASTRON ASTROPHYS, 494(1), 317-327.
- The problem of phase mixed shear Alfven waves in the solar corona revisited. ASTRON NACHR, 329(8), 780-785.
- Nonlinear theory of resonant slow waves in anisotropic and dispersive plasmas. PHYS PLASMAS, 15(8).
- Forced oscillations of coronal loops driven by EIT waves. ASTRON ASTROPHYS, 488(3), 1125-1132.
- Sampling the coronal magnetic field. Aip Conference Proceedings, 934, 44-53.
- MHD waves at a spherical interface modelling EIT waves. ASTRON NACHR, 328(8), 769-772.
- Dispersive shock waves in the solar wind. ASTRON NACHR, 328(8), 734-737.
- Untitled. ASTRON NACHR, 328(8), 725-725.
- Heating of the solar and stellar coronae: a review. ASTRON NACHR, 328(8), 726-733.
- Thermally damped linear compressional waves in a 2D solar coronal model. Proceedings of the International Astronomical Union, 3(S247), 320-323.
- MHD waves at a spherical interface modelling coronal global EIT waves. Proceedings of the International Astronomical Union, 3(S247), 251-254.
- Coronal global EIT waves as tools for multiple diagnostics. Proceedings of the International Astronomical Union, 3(S247), 243-250.
- Thermosolutal stability of a two-component rotating plasma with finite Larmor radius. PROC ROM ACAD SER A, 8(2), 111-120.
- Diagnostics of local and global coronal magnetic field using global coronal waves. Proceedings of the International Astronomical Union, 2(233), 132-133.
- Slow magnetohydrodynamic waves in stratified and viscous plasmas. PHYS PLASMAS, 13(4).
- Magnetohydrodynamic modes in a periodic magnetic steady state medium. ASTRON ASTROPHYS, 449(3), 1193-1202.
- Untitled. PHILOS T ROY SOC A, 364(1839), 471-472.
- The damping of slow magnetoacustic waves in coronal loops. J OPTOELECTRON ADV M, 8(4), 1562-1564.
- Propagating magnetohydrodynamics waves in coronal loops. Philosophical Transactions of the Royal Society A Mathematical Physical and Engineering Sciences, 364(1839), 461-472.
- On the nature of coronal EIT waves. ASTROPHYS J, 633(2), L145-L148.
- Seismology of the sun: From the inner core to the corona. Observatory, 125(1187), 224-227.
- The sound of the Sun. ASTRON GEOPHYS, 46(4), 27-30.
- Damping of compressional waves in coronal prominences. European Space Agency Special Publication ESA SP(547), 211-214.
- Damping of coronal EIT waves as a tool for plasma diagnostics. European Space Agency Special Publication ESA SP(547), 433-440.
- The Sun: for academics, students and idiots. Astronomy and Geophysics, 45(4), 4.44-4.45.
- The effect of anisotropy on the propagation of linear compressional waves in magnetic flux tubes: Applications to astrophysical plasmas. ASTRON ASTROPHYS, 415(2), 691-703.
- On dissipative effects in solar prominences. ASTRON ASTROPHYS, 410(2), L17-L19.
- Linear and non-linear MHD wave propagation in steady-state magnetic cylinders. SOL PHYS, 217(2), 199-223.
- Solitary waves in a Hall solar wind plasma. ASTRON ASTROPHYS, 404(2), 701-707.
- Ducted compressional waves in the magnetosphere in the double-polytropic approximation. ANN GEOPHYS-GERMANY, 20(10), 1553-1558.
- Extended Leibovich-Roberts equation in rarefied plasmas. PHYS PLASMAS, 9(10), 4280-4284.
- Nonlinear theory of resonant slow MHD waves in twisted magnetic flux tubes. J PLASMA PHYS, 67, 79-97.
- Linear and nonlinear wave propagation in rarefied plasmas. PHYS PLASMAS, 9(6), 2593-2603.
- Dynamics of nonlinear resonant slow MHD waves in twisted flux tubes. NONLINEAR PROC GEOPH, 9(2), 79-86.
- Nonlinear resonant absorption of fast magnetoacoustic waves due to coupling into slow continue in the solar atmosphere. ASTRON ASTROPHYS, 368(2), 662-675.
- Nonlinear theory of non-axisymmetric resonant slow waves in straight magnetic flux tubes. J PLASMA PHYS, 64, 579-599.
- Linear and nonlinear resonant interaction of sound waves in dissipative layers. J PLASMA PHYS, 64, 235-247.
- Resonant absorption of nonlinear slow MHD waves in isotropic steady plasmas - II. Application: Resonant acoustic waves. SOL PHYS, 186(1-2), 67-97.
- Interaction of sound waves with slow dissipative layers in anisotropic plasmas in the approximation of weak nonlinearity. PHYS PLASMAS, 5(6), 2264-2273.
- Nonlinear theory of slow dissipative layers in anisotropic plasmas. PHYS PLASMAS, 5(1), 252-260.
- Resonant absorption of nonlinear slow MHD waves in isotropic steady plasmas - I. Theory. SOL PHYS, 180(1-2), 65-79.
Conference proceedings
- Wave-particle interactions in the Earth magnetotail during dipolarization. EGU General Assembly 2023. Vienna, Austria, 23 April 2023 - 23 April 2023. View this article in WRRO
- Sheffield University Nova Rocket Innovative Design Engineering (SUNRIDE). 24th ESA Symposium on European Rocket and Balloon Programmes and Related Research Proceedings (pp 122-127). Noordwijk, The Netherlands, 16 June 2019 - 16 June 2019. View this article in WRRO
- Thermally damped waves in the solar corona. FLOWS, BOUNDARIES, INTERACTIONS, Vol. 934 (pp 64-70)
- MHD waves in stratified and dissipative plasmas. Fifty Years of Romanian Astrophysics, Vol. 895 (pp 141-146)
- Global coronal seismology. SOLAR PHYSICS, Vol. 246(1) (pp 177-185)
- Nonlinear waves in solar plasmas - a review. First International Workshop and Summer School on Plasma Physics, Vol. 44 (pp 20-29)
- Wave damping in hall plasmas - Application to the solar wind. SOLMAG 2002: PROCEEDINGS OF THE MAGNETIC COUPLING OF THE SOLAR ATMOSPHERE EUROCONFERENCE AND IAU COLLOQUIUM 188, Vol. 505 (pp 345-348)
- Linear and nonlinear waves in dilute plasmas. WAVES IN DUSTY, SOLAR, AND SPACE PLASMAS, Vol. 537 (pp 152-159)
- Absorption of fast magnetosonic waves in the solar atmosphere in the limit of weak nonlinearity. WAVES IN DUSTY, SOLAR, AND SPACE PLASMAS, Vol. 537 (pp 144-151)
- Strongly nonlinear resonant MHD waves in the steady solar magnetic canopy. 9TH EUROPEAN MEETING ON SOLAR PHYSICS: MAGNETIC FIELDS AND SOLAR PROCESSES, VOLS 1 AND 2, Vol. 448 (pp 263-267)
- Nonlinear resonant MHD waves in the atmosphere of the sun. 8TH SOHO WORKSHOP: PLASMA DYNAMICS AND DIAGNOSTICS IN THE SOLAR TRANSITION REGION AND CORONA, PROCEEDINGS, Vol. 446 (pp 155-160)
Preprints
- Disentangling Vortex-driven Dynamics in the Solar Atmosphere Using Information Theory, arXiv.
- Solar Vortices as Conduits for Magnetoacoustic Waves: Multi-Layer Coupling and Their Role in Atmospheric Heating, arXiv.
- Global CME-driven oscillations in the outer solar corona, arXiv.
- Driven phase-mixed Alfvén waves in a partially ionized solar plasma, arXiv.
- 3D MHD wave propagation and energy transport in a simulated solar vortex, arXiv.
- Modeling the effects of a lightbridge on oscillations in a solar pore, arXiv.
- Sausage, kink, and fluting MHD wave modes identified in solar magnetic pores by Solar Orbiter/PHI, arXiv.
- Phase mixing of propagating Alfv{é}n waves in a single-fluid partially ionized solar plasma, arXiv.
- Atmospheric waves disturbances from the solar terminator according to the VLF radio stations data, arXiv.
- The temporal and spatial evolution of MHD wave modes in sunspots, arXiv.
- Comparison of exact and approximate MHD slow body mode solutions in photospheric waveguides, arXiv.
- Small-scale solar jet formation and their associated waves and instabilities, arXiv.
- The importance of horizontal Poynting flux in the solar photosphere, arXiv.
- New approach for analysing dynamical processes on the surface of photospheric vortex tubes, arXiv.
- Waves in weakly ionised solar plasmas, arXiv.
- Magnetohydrodynamic wave mode identification in circular and elliptical sunspot umbrae: evidence for high order modes, arXiv.
- Time-dependent properties of sunspot groups -- I. Lifetime and asymmetric evolution, arXiv.
- Slow magnetoacoustic waves in gravitationally stratified two-fluid plasmas in strongly ionised limit, arXiv.
- Proper Orthogonal and Dynamic Mode Decomposition of Sunspot Data, arXiv.
- Critical Science Plan for the Daniel K. Inouye Solar Telescope (DKIST), arXiv.
- Diagnostics of plasma ionisation using torsional Alfén waves, arXiv.
- Magnetic Rayleigh-Taylor Instability at a Contact Discontinuity With Oblique Magnetic Field, arXiv.
- Dispersive shock waves in partially ionised plasmas, arXiv.
- Propagation of Leaky MHD Waves at Discontinuities with Tilted Magnetic Field, arXiv.
- Dissipative instabilities in a partially ionised prominence plasma slab: II. The effect of compressibility, arXiv.
- Dissipative instability in a partially ionised prominence slab, arXiv.
- Statistical study of spatio-temporal distribution of precursor solar flares associated with major flares, arXiv.
- Dissipative instability in partially ionised prominence plasmas, arXiv.
- Statistical relationship between the succeeding solar flares detected by the RHESSI satellite, arXiv.
- Sausage Mode Propagation in a Thick Magnetic Flux Tube, arXiv.
- Three-dimensional numerical simulation of magnetohydrodynamic-gravity waves and vortices in the solar atmosphere, arXiv.
- Transverse kink oscillations of expanding coronal loops, arXiv.
- The effect of the environment on the P1/P2 period ratio for kink oscillations of coronal loops, arXiv.
- TRACE Observations of Driven Loop Oscillations, arXiv.
- Nonlinear effects in resonant layers in solar and space plasmas, arXiv.
- Resonant Absorption of Fast Magnetoacoustic Waves due to Coupling into the Slow and Alfven Continua in the Solar Atmosphere, arXiv.
- The effect of longitudinal flow on resonantly damped kink oscillations, arXiv.
- Mean shear flows generated by nonlinear resonant Alfven waves, arXiv.
- Nonlinear resonant absorption of fast magnetoacoustic waves in strongly anisotropic and dispersive plasmas, arXiv.
- On the validity of nonlinear Alfven resonance in space plasmas, arXiv.
- Nonlinear theory of resonant slow waves in anisotropic and dispersive plasmas, arXiv.
- Forced oscillations of coronal loops driven by EIT waves, arXiv.
- Global coronal seismology, arXiv.
- Driven phase-mixed Alfvén waves in a partially ionized solar plasma. The Astrophysical Journal, 988(1). View this article in WRRO
- Research group
- Grants
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Past grants, as Principal Investigator
Instabilities in partially ionized prominence plasmas Leverhulme Damping of Forced Oscillations in Coronal Loops RS Conference Attendance RS Global Coronal Seismology Using SOHO/EIT Observations Nuffield Past grants, as Coinvestigator
Application to STFC for Consolidated Grant Support for the Solar Physics and Space Plasma Research Centre (SP2RC) STFC Consolidated Grant Support for the Solar Physics and Space Plasma Research Centre (SP2RC) STFC Heating and Magneto-Seismology of the Solar Atmosphere STFC
- Teaching interests
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- Differential and difference equations
- Complex Analysis
- Numerical methods