Dr Istvan Ballai

School of Mathematics and Statistics

Senior Lecturer

I.Ballai@shef.ac.uk
+44 114 222 3833

Full contact details

Dr Istvan Ballai
School of Mathematics and Statistics
H9
Hicks Building
Hounsfield Road
Sheffield
S3 7RH
Research interests

Dr. Istvan Ballai's main research interest is in linear and nonlinear 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 serve as a perfect tool for plasma diagnostics.

We 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.

Dr Istvan Ballai's reserch interest also covers dynamical aspects in such plasmas, including waves and instabilities, non-equilibrium effects, etc.

Publications

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Journal articles

Conference proceedings papers

  • Cho Y-H, Lim J, Kalra A, Nair V, Rontogiannis G, Seniuc I-V, Schiona A, Narayanankutty G, Ioannou K, Lennard MG , Appleby B et al (2019) 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 - 20 June 2019. View this article in WRRO RIS download Bibtex download
  • Ballai I (2007) Global coronal seismology. SOLAR PHYSICS, Vol. 246(1) (pp 177-185) RIS download Bibtex download
  • Marcu A & Ballai I (2007) Thermally damped waves in the solar corona. FLOWS, BOUNDARIES, INTERACTIONS, Vol. 934 (pp 64-70) RIS download Bibtex download
  • Ballai I (2007) MHD waves in stratified and dissipative plasmas. Fifty Years of Romanian Astrophysics, Vol. 895 (pp 141-146) RIS download Bibtex download
  • Ballai I (2006) Nonlinear waves in solar plasmas - a review. First International Workshop and Summer School on Plasma Physics, Vol. 44 (pp 20-29) RIS download Bibtex download
  • Ballai I, Thelen JC & Roberts B (2002) 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) RIS download Bibtex download
  • Ballai I, Erdelyi R & Goossens M (2000) Linear and nonlinear waves in dilute plasmas. WAVES IN DUSTY, SOLAR, AND SPACE PLASMAS, Vol. 537 (pp 152-159) RIS download Bibtex download
  • Ballai I, Erdelyi R & Goossens M (2000) 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) RIS download Bibtex download
  • Erdelyi R, Ballai I & Ruderman MS (1999) 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) RIS download Bibtex download
  • Ballai I & Erdelyi R (1999) 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) RIS download Bibtex download
Research group

Plasma Dynamics Group

Grants

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
  • Differential and difference equations
  • Complex Analysis
  • Numerical methods