Dr Istvan Ballai
School of Mathematical and Physical Sciences
Senior Lecturer in Applied Mathematics
+44 114 222 3833
Full contact details
School of Mathematical and Physical Sciences
H9
Hicks Building
Hounsfield Road
ºù«Ӱҵ
S3 7RH
- Research interests
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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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Featured publications
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All publications
Journal articles
- . The Astrophysical Journal, 975(1), 118-118.
- . The Astrophysical Journal, 975(1), 45-45.
- . Journal of Atmospheric and Solar-Terrestrial Physics, 106364-106364.
- . Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 382(2272).
- . Monthly Notices of the Royal Astronomical Society, 529(1), 748-760.
- . The Astrophysical Journal, 963(1), 10-10.
- . The Astrophysical Journal, 958(1), 81-81.
- . The Astrophysical Journal, 954(1), 30-30.
- . Advances in Space Research.
- . The Astrophysical Journal Letters, 948(2).
- . Advances in Space Research.
- . The Astrophysical Journal, 938(1), 32-32.
- . Advances in Space Research.
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- . The Astrophysical Journal, 928(1), 3-3.
- . The Astrophysical Journal, 927(2), 201-201.
- . The Astrophysical Journal, 927(2).
- . Monthly Notices of the Royal Astronomical Society, 511(4), 5274-5286.
- . Bulletin of Taras Shevchenko National University of Kyiv. Astronomy(66), 20-25.
- . Solar Physics, 296(4).
- . Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 379(2190).
- . Monthly Notices of the Royal Astronomical Society, 501(2), 1940-1950.
- . Solar Physics, 295(12).
- . Astronomy & Astrophysics, 635.
- . Astronomy and Astrophysics.
- . Frontiers in Astronomy and Space Sciences, 6.
- . Physics of Plasmas, 25(12).
- . Advances in Space Research.
- . Solar Physics, 293.
- . Astronomy & Astrophysics, 609, A23-A23.
- . Astronomy & Astrophysics, 610, A56-A56.
- . Astronomy & Astrophysics.
- . Monthly Notices of the Royal Astronomical Society, 459(4), 3532-3539.
- . Astronomy & Astrophysics, 577, A82-A82.
- . Astronomische Nachrichten, 334(9), 948-951.
- . ASTRON ASTROPHYS, 527.
- . Journal of Physics: Conference Series, 218(1).
- . PHYS PLASMAS, 16(7).
- . PHYS PLASMAS, 16(4).
- . ASTRON ASTROPHYS, 494(1), 317-327.
- . ASTRON NACHR, 329(8), 780-785.
- . ASTRON ASTROPHYS, 488(3), 1125-1132.
- . PHYS PLASMAS, 15(8).
- 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.
- Thermosolutal stability of a two-component rotating plasma with finite Larmor radius. PROC ROM ACAD SER A, 8(2), 111-120.
- . 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.
- . Proceedings of the International Astronomical Union, 3(S247), 243-250.
- . AIP Conference Proceedings, 934, 44-53.
- The damping of slow magnetoacustic waves in coronal loops. J OPTOELECTRON ADV M, 8(4), 1562-1564.
- . ASTRON ASTROPHYS, 449(3), 1193-1202.
- . PHYS PLASMAS, 13(4).
- Untitled. PHILOS T ROY SOC A, 364(1839), 471-472.
- . Proceedings of the International Astronomical Union, 2(233), 132-133.
- . 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.
- The sound of the Sun. ASTRON GEOPHYS, 46(4), 27-30.
- Seismology of the sun: From the inner core to the corona. Observatory, 125(1187), 224-227.
- . Astronomy and Geophysics, 45(4), 4.44-4.45.
- . ASTRON ASTROPHYS, 415(2), 691-703.
- 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.
- . ASTRON ASTROPHYS, 410(2), L17-L19.
- Linear and non-linear MHD wave propagation in steady-state magnetic cylinders. SOL PHYS, 217(2), 199-223.
- . ASTRON ASTROPHYS, 404(2), 701-707.
- . PHYS PLASMAS, 9(10), 4280-4284.
- Ducted compressional waves in the magnetosphere in the double-polytropic approximation. ANN GEOPHYS-GERMANY, 20(10), 1553-1558.
- . PHYS PLASMAS, 9(6), 2593-2603.
- Dynamics of nonlinear resonant slow MHD waves in twisted flux tubes. NONLINEAR PROC GEOPH, 9(2), 79-86.
- . J PLASMA PHYS, 67, 79-97.
- 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.
- Resonant absorption of nonlinear slow MHD waves in isotropic steady plasmas - I. Theory. SOL PHYS, 180(1-2), 65-79.
- 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.
- . Universe, 10(8), 334-334.
- . Astronomy & Astrophysics.
- . Frontiers in Astronomy and Space Sciences, 10, 1226200.
- . Vol. 55, Issue 3 (Heliophysics 2024 Decadal Whitepapers), 55(3).
- . Fluids, 6(12), 454-454.
- . MNRAS, 441, 1157-1165.
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- . 2013SoPh..tmp..229P.
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- . Solar Physics 06/2010.
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- . Astronomy and Astrophysics.
Conference proceedings papers
- . EGU General Assembly 2023. Vienna, Austria, 23 April 2023 - 23 April 2023.
- ºù«Ӱҵ 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 - 20 June 2019.
- . SOLAR PHYSICS, Vol. 246(1) (pp 177-185)
- 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)
- . 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
- Modeling the effects of a lightbridge on oscillations in a solar pore.
- 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.
- 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.
- 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.
- 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