×
  • Home

  • About

  • Members

  • Useful info

  • PhD studentship

  • Visualisations

  • Menu

    Members

    Academics | Research Associates | PhD Students | Members | Academic Visitors | Former Academic Members | Former Research Associates | Former PhD Students

    Academics

    back to top

    Istvan Ballai


    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.


    Publications

    AdsLabs   Ads    Web of Science  

    School of Mathematics and Statistics
    The University of Sheffield
    Hicks Building, Hounsfield Road,
    Sheffield, S3 7RH
    United Kingdom
    Phone: +44 (0)114 222 38 28
    E-mail: i.ballai at sheffield.ac.uk
    Departmental personal webpage




    Viktor Fedun


    My research is primarily concerned with the mathematical modelling of physics of
    - solar/space plasmas;
    - sun-solar wind;
    - solar-terrestrial systems.
    The study of processes occurring in such systems is crucially important for understanding the Sun, predicting Space Weather and understanding the dynamics of space and laboratory plasmas. This includes mathematical modelling of solar magnetic flux tubes and processes that heat and maintain the coronal plasma at multi-million degree temperatures; studying fundamental plasma processes such as waves and instabilities in inhomogeneous media; determining the physical parameters of solar magnetic structures.


    Publications

    via personal page   AdsLabs   Ads    Web of Science   Google Scholar

    Department of Automatic Control and Systems Engineering
    The University of Sheffield
    Mappin Street, Sheffield, S1 3JD
    United Kingdom
    Phone: +44 (0)114 222 51 97
    Skype: viktorfedun
    E-mail: v.fedun at sheffield.ac.uk
    Personal webpage
    Departmental personal webpage





    Rekha Jain


    Dr Rekha Jain is interested in physical processes of plasmas. Her recent research has been focussed on investigating, theoretically and observationally, various wave phenomena that occur on the Sun. More specifically,
    - investigating the effects of magnetism on the solar oscillations;
    - studying wave propagation in astrophysical atmospheres;
    - Modelling and analysing resonant modes of magnetic loops in the Sun's corona;
    - understanding how the Sun's outer atmosphere is heated to million degrees;
    - modelling of magnetic reconnection and nanoflare heating;
    - numerical simulation of forced magnetic reconnection.


    Publications

    School of Mathematics and Statistics
    The University of Sheffield
    Hicks Building, Hounsfield Road,
    Sheffield, S3 7RH
    United Kingdom
    Phone: +44 (0114) 222 37 32
    E-mail: R.Jain at sheffield.ac.uk
    Personal webpage
    Departmental personal webpage




    Gary Verth


    I am interested in the energy transport and dissipation of various MHD waves modes on their journey up through the Sun's atmosphere. My models are tested using the latest highest spatial/temporal resolution ground- and space-based wave observations. More recently I have become interested in testing these MHD models in the laboratory plasma experiments.


    Publications

    AdsLabs   ADS


    School of Mathematics and Statistics
    The University of Sheffield
    Hicks Building, Hounsfield Road,
    Sheffield, S3 7RH
    United Kingdom
    Phone: +44 (0114) 222 38 28
    E-mail: g.verth at shef.ac.uk
    Departmental personal webpage




    Research Associates

    back to top

    Suzana de Souza e Almeida Silva




    Department of Automatic Control and Systems Engineering
    The University of Sheffield
    Mappin Street, Sheffield, S1 3JD
    United Kingdom




    PhD Students

    back to top

    Abdulaziz Alharbi


    Mr. Abdulaziz Hamadi H Alharbi is working on waves and oscillations in partially ionized plasmas, with a special emphasis on the development and propagation of linear and nonlinear waves.
    Supervisors: Dr. Istvan Ballai, Dr. Gary Verth, Dr. Viktor Fedun


    School of Mathematics and Statistics
    The University of Sheffield
    Hicks Building, Hounsfield Road,
    Sheffield, S3 7RH
    United Kingdom
    E-mail: aalharbi8 at sheffield.ac.uk




    Abdulrahman Badah Albidah


    Abdulrahman will be working on analysis of coupled shock waves in two-fluid plasmas, where the coupling will be provided by the collision between particles. Using a multi-scaling approach we will determine the nonlinear evolutionary equations of these shocks and determine their temporal evolution using a Cole-Hopf transform.
    Supervisors: Dr. Istvan Ballai, Dr. Gary Verth, Dr. Viktor Fedun


    School of Mathematics and Statistics
    The University of Sheffield
    Hicks Building, Hounsfield Road,
    Sheffield, S3 7RH
    United Kingdom
    E-mail: abalbidah1 at sheffield.ac.uk




    Anwar Aldhafeeri


    Ms. Anwar Aldhafeeri is working on Conformal Mapping of The Linearized MHD Wave Equations.
    Supervisors: Dr. Gary Verth, Dr. Viktor Fedun


    School of Mathematics and Statistics
    The University of Sheffield
    Hicks Building, Hounsfield Road,
    Sheffield, S3 7RH
    United Kingdom
    E-mail: aaaldhafeeri1 at sheffield.ac.uk




    Farhad Allian


    Mr. Farhad Allian is working on MHD waves and plasma instabilities in the Solar atmosphere.
    Supervisor: Dr. Rekha Jain


    School of Mathematics and Statistics
    The University of Sheffield
    Hicks Building, Hounsfield Road,
    Sheffield, S3 7RH
    United Kingdom
    E-mail: FAllian1 at sheffield.ac.uk




    Max Mcmurdo


    Mr. Max Mcmurdo is working on problems related to the MHD wave propagation in the Solar atmosphere.
    Supervisors: Drs. Gary Verth, Istvan Ballai and Viktor Fedun


    School of Mathematics and Statistics
    The University of Sheffield
    Hicks Building, Hounsfield Road,
    Sheffield, S3 7RH
    United Kingdom
    E-mail: mmcmurdo1 at sheffield.ac.uk




    Samuel Joseph Skirvin



    Samuel (STFC funded student) is working on observational, numerical and analytical studies of the Kelvin-Helmholtz and Rayleigh-Taylor in solar plasma. In particular:
    - observationally identify regimes of appearance of the RT instability, its morphology and lifetime by analysing Solar Optical Telescope data (Ca II spectral lines) on board the Hinode satellite and ground-based data from the Swedish Solar Telescope (SST).
    - numerically model jet like structures, with particular interest in processes related to the magnetic field strength and direction to analyse the appearance and development of the RT instability at the top part of the jet due-to effective acceleration. Additionally, investigate processes related to the Kelvin-Helmholtz (KH) instability taking place during the evolution of the jet.
    - analytically obtain conditions for RT and KH instabilities in the presence of a magnetic field (for example modeled by using self-similar approach) and apply them to the observational and numerical data discussed in the previous points.
    - analysis of wave excitation (MHD waves including Alfven) and their energy budget directly due to jet propagation.
    Supervisors: Dr. Viktor Fedun


    Department of Automatic Control and Systems Engineering
    The University of Sheffield
    Mappin Street, Sheffield, S1 3JD
    United Kingdom
    Departmental personal webpage
    E-mail: sjskirvin1 at sheffield.ac.uk




    Yasir Mohammed H Aljohani


    In the framework of his PhD project, Yasir will study Rayleigh Taylor Instability (RTI) in the solar plasma. In particular:
    - observationally identify regimes of appearance of the RTI, its morphology and lifetime by analysing Solar Optical Telescope data (Ca II spectral lines) on board Hinode satellite and ground-base data from Swedish Solar Telescope (SST).
    - numerically model jet like structures, with particular interest in processes related to the magnetic field strength and direction to analyse appearance and development of RTI at the top part of the jet due-to effective acceleration.
    Additionally, investigate processes related to the Kelvin-Helmholtz (KH) instability taking place during the evolution of the jet.
    - analytically obtain conditions for RT and KH instabilities in the presence of a magnetic field (for example modelled by using self-similar approach) and apply them to the observational and numerical data discussed in the previous points.
    The project will provide a much better understanding of the plasma processes related to RT and KH instabilities and will be extremely useful for understanding the morphology of solar jets. The project is also important for data understanding which will be soon available for sola-space community from a new generation of high-resolution instruments i.e. DIKIST and EST.
    Supervisors: Dr. Istvan Ballai, Dr. Gary Verth, Dr. Viktor Fedun


    School of Mathematics and Statistics
    The University of Sheffield
    Hicks Building, Hounsfield Road,
    Sheffield, S3 7RH
    United Kingdom
    E-mail: yaljohani2 at sheffield.ac.uk




    Yuyang Yuan


    In the framework of the project Yuyang will study the physics and main properties of solar spicules, which are fundamentally important for the understanding of energy transport between the lower and upper layers of the solar atmosphere. The machine learning, deep learning and pattern recognition methods will be used for comprehensive analysis of observational data. He will develop a new algorithm to fully automate the process of spicule identification and tracking to facilitate a more robust statistical analysis of their properties (based on Solar-H-alpha and Ca-II spectral observations). These analyses will be based on the techniques mentioned above which will be complemented by computer vision, POD/DMD methods. Results of the project will lead to the better understanding of the origin of spicules and their generic properties i.e. length, width, life-time and behaviour (oscillations). By developing this automated detection and tracking system, it will both speed up the analysis processes and save time for further study. This research is extremely important for near future solar observations with the new Daniel K. Inouye Solar Telescope (DKIST, USA), European Solar Telescope (EST, Europe) which are being constructed and aimed at resolving the solar coronal heating paradox. The UK and UoS academics in DKIST is supported by STFC.
    Supervisors: Dr. Gary Verth, Dr. Viktor Fedun


    School of Mathematics and Statistics
    The University of Sheffield
    Hicks Building, Hounsfield Road,
    Sheffield, S3 7RH
    United Kingdom



    Members

    back to top

    Mykola Gordovskyy


    Dr. Mykola Gordovskyy works in the field of solar physics with particular interests in particle acceleration in various solar magnetic field configurations.


    Publications

    ADS

    School of Physics and Astronomy
    The University of Manchester
    Alan Turing Building, Manchester,
    United Kingdom
    E-mail: Mykola.Gordovskyy at manchester.ac.uk
    Departmental personal webpage




    Dave Jess


    Dr Dave Jess main studies of the Sun concern its lower atmosphere which can be seen in optical wavelengths. I am predominantly interested in how the Sun's energy travels through its atmosphere, both in the form of flares and waves. To study this, Dave utilizes a wide range of instruments, including the Queen's University developed ROSA camera system, as well as the Royal Society funded Hydrogen-Alpha Rapid Dynamics camera (HARDcam), of which he is the Principal Investigator.



    Publications

    ADS

    Astrophysics Research Centre
    School of Mathematics and Physics
    Queen's University
    Physics Building,
    Belfast, BT71NN
    United Kingdom
    Phone: +44 (0) 28 9097 6338
    E-mail: d.jess at qub.ac.uk
    Departmental personal webpage




    Yuriy Khotyaintsev


    Research: Magnetospheric Physics, magnetic reconnection and particle energization, analysis of satellite data.


    Publications

    ADS

    Swedish Institute of Space Physics
    Uppsala, Sweden
    Phone: +46 18 471 59 29
    E-mail: yuri at irfu.se
    Personal webpage




    Alexandr Rozhnoi


    My current research is connected with the investigation of electromagnetic phenomena related to large earthquakes in the global lithosphere-atmosphereionosphere coupled system using simultaneous satellite and ground-based observations. The seismo-electromagnetic effects are the electric and magnetic perturbations caused by natural geophysical activities such as earthquakes, tsunami and volcanic eruptions. It includes: electromagnetic emissions in a large frequency range, perturbations of ionospheric layers, anomalies on the records of Very Low Frequency transmitter signals, and night airglow observations. Such phenomena are of great interest, because they may start several days or a few hours before the shock and can be considered as short term precursors. A main problem in using of this method is to distinguish the physical processes in the ionosphere, which are generated by lithosphere, atmosphere (i.e. planetary waves, cyclones) or solar activity (i.e. CME, solar flares, etc.).


    Publications

    ADS

    The Schmidt Institute of Physics of the Earth of the Russian Academy of Sciences
    10-1,Gruzinskaya str. Moscow,
    Russia
    Phone: +7 499 254 93 95
    E-mail: rozhnoi at ifz.ru




    Eamon Scullion


    Observational Solar Physics, Numerical Simulations of the Sun, Plasma Physics, Magneto-Hydrodynamics, Astrophysics.


    Publications

    ADS

    Department of Mathematics, Physics and Electrical Engineering
    Northumbria University
    Newcastle Upon Tyne
    Ellison Building
    Ellison Place
    NE1 8ST
    United Kingdom
    E-mail: eamon.scullion at northumbria.ac.uk
    Departmental personal webpage




    Sergiy Shelyag


    Sergiy's main research interests and experience are in large-scale mathematical modelling of astrophysical processes, astrophysical plasma physics, computational fluid dynamics and magnetohydrodynamics (MHD), numerical radiative transport and spectropolarimetry with applications to the solar and stellar atmospheres.


    Publications

    ADS

    AIDA research cluster, School of Information Technology,
    Faculty of Science, Engineering and Built Environment,
    Deakin University
    221 Burwood Highway
    Burwood
    VIC 3125
    Australia
    Phone: +61 3 924 68873
    E-mail: sergiy.shelyag at deakin.edu.au




    Academic Visitors

    back to top

    Sergey Ruzheinikov


    Sergiy's main research interests and experience are in data amnalysis and mathematical modelling of Very Low Frequency waves in the Earth-Ionosphere wave guide.

    Department of Automatic Control and Systems Engineering
    The University of Sheffield
    Mappin Street, Sheffield, S1 3JD
    United Kingdom
    Contact Dr. Viktor Fedun
    E-mail: luxs at quidunited.co.uk




    Former Academic Members

    back to top

    Eun-jin Kim


    Research interests
    - MHD turbulence and transport of magnetic fields, momentum and chemical species;
    - Generation and evolution of magnetic fields (dynamos) and differential rotations;
    - Anomalous transport and its reguation in laboratory plasmas;
    - Non-equilibrium statistical theory, structure formation and self-organisation.


    Publications

    Google Scholar  ResearchGate


    School of Mathematics and Statistics
    The University of Sheffield
    Hicks Building, Hounsfield Road,
    Sheffield, S3 7RH
    United Kingdom
    Phone: +44 (0114) 222 38 76
    E-mail: E.Kim at shef.ac.uk
    Personal webpage
    Departmental personal webpage


    Alastair Williamson


    I am interested in the mathematical modelling and analysis of MHD wave propagation in the various magnetic configurations of the solar atmosphere.


    Publications

    School of Mathematics and Statistics
    The University of Sheffield
    Hicks Building, Hounsfield Road,
    Sheffield, S3 7RH
    United Kingdom
    Phone: +44 (0114) 222 38 18
    E-mail: A.Williamson at shef.ac.uk
    Departmental personal webpage




    Former Research Associates

    back to top

    Yuyang Yuan



    01.02.2020-31.08.2020


    Department of Automatic Control and Systems Engineering
    The University of Sheffield
    Mappin Street, Sheffield, S1 3JD
    United Kingdom




    Former PhD Students

    back to top

    Eleanor Vickers


    2015-2019
    Supervisors: Dr Istvan Ballai and Prof R Von Fay-Siebenburgen


    School of Mathematics and Statistics
    The University of Sheffield
    Hicks Building, Hounsfield Road,
    Sheffield, S3 7RH
    United Kingdom



    Hope Thackray


    2016-2020
    Supervisor: Dr. Rekha Jain


    School of Mathematics and Statistics
    The University of Sheffield
    Hicks Building, Hounsfield Road,
    Sheffield, S3 7RH
    United Kingdom



    Ioannis Giagkiozis


    2013-2017
    Supervisors: Dr G Verth, Prof R Von Fay-Siebenburgen, Dr V Fedun


    School of Mathematics and Statistics
    The University of Sheffield
    Hicks Building, Hounsfield Road,
    Sheffield, S3 7RH
    United Kingdom