The Institute of Geophysics of the Polish Academy of Sciences is the leading scientific centre in Poland in the field of the Earth physics research. The Institute's research programme considers experimental and theoretical studies in scientific disciplines such as seismology, geomagnetism, atmospheric physics, geophysical imaging, lithospheric research, hydrology & hydrodynamics and polar & marine research. The Institute employs about 200 people (including 60 academics) and is a member of major international geophysical bodies.

As a member of the Geoplanet Doctoral School and Environmental Doctoral School, the Institute of Geophysics offers the PhD courses in geophysics. The course lasts 4 years, is conducted in English and ends with a PhD thesis. During the course, the student attends lectures and participates in research under the direction of a supervisor.

**Doctoral students can receive, for the duration of their studies, a doctoral scholarship 2100 PLN monthly. The best three candidates from abroad may apply for scholarship 5000 PLN monthly. PhD scholarships paid as part of scientific projects conducted by some supervisors (e.g. National Science Centre of Poland - see below) can reach 5000 PLN monthly (depend on the project).**

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The Institute of Geophysics seeks applicants

for five doctoral positions

in Geomagnetism and related topics.

**1. Electromagnetic Soundings of the Earth's Interior**

The task of the PhD student includes participation in field measurements, processing of the collected data, carrying out resistivity model calculations and interpretation of the models. Moreover, there is a possibility to develop processing and modelling tools further which are used for analysis of magnetotelluric data. The working group deals with magnetotelluric and related methods, where electric and magnetic field variations are used to obtain a model of the regional distribution of electric resistivity in the Earth's crust and upper mantle, which can be interpreted in terms of tectonics, continental evolution and geodynamics.
Requirements for candidates: should hold a master's degree in geophysics, physics, or a related discipline. Programming skills are additional asset.

For more information contact Dr Waldemar Józwiak (jozwiak@igf.edu.pl)

**2. Numerical analysis of hydromagnetic dynamo driven by the Magnetic Buoyancy Instability**

The research project is financed by the National Science Centre of Poland. The task of the PhD student will be the analysis of the so-called Magnetic Buoyancy Instability (MBI) and its relation to hydro-magnetic dynamo in the solar interior. The study will be concerned with a model of the solar tachocline - a region of large shear, where the Solar toroidal field is greatly amplified. The PhD student will be required to do both the theoretical and numerical analysis of the dynamical equations, that is the Navier-Stokes equation with the Lorentz force and the induction equation resulting from Maxwell's and Ohm's laws. The ultimate aim of the project is to establish the effective dynamical equations governing the magnetic field evolution in the Solar tachocline, based on the temporal and spatial scales introduced by the MBI. The next step is to solve the derived set of equations via numerical methods, which would allow to model the time evolution of the Solar magnetic field.

Requirements for candidates: should possess solid basis in the fields of mathematics and physics (candidates who graduated from physical and/or mathematical faculties are preferred). Programming skills (e.g. C, FORTRAN, PYTHON etc.). Experience in the fields of fluid dynamics and/or electrodynamics is greatly welcome.

For more information contact Dr Krzysztof Mizerski (kamiz@igf.edu.pl)

**3. Numerical analysis of new mechanisms of a large-scale hydromagnetic dynamo**

The task of the student will be to analyse numerically new mechanisms of generation of planetary and stellar magnetic fields, within the framework of the mean field theory. The mechanisms are based on interactions of distinct waves and through that formation of a large-scale electromotive force. Particularly effective are beating waves and nonlinear interactions. Both the linear limit of weak fields as well as the process of nonlinear saturation will be analysed. The aim of the project is the investigation of the mechanism of generation of large scale fields in nature (identified in Mizerski, Bajer & Moffatt, J. Fluid Mech. 707, 111, 2012) and their nonlinear evolution in systems with negligibly small magnetic diffusion.

Requirements for candidates: should possess solid basis in the fields of mathematics and physics (candidates who graduated from physical and/or mathematical faculties are preferred). Programming skills (e.g. C, FORTRAN, PYTHON etc.). Experience in the fields of fluid dynamics and/or electrodynamics is greatly welcome.

For more information contact Dr Krzysztof Mizerski (kamiz@igf.edu.pl)

**4. Analysis of the so-called Magnetic Buoyancy Instability (MBI) and its relation to hydro-magnetic dynamo in the solar interior**

The task of the student will be involve analysis of the so-called Magnetic Buoyancy Instability (MBI) and its relation to hydro-magnetic dynamo in the solar interior. The study will be concerned with a model of the solar tachocline - a region of large shear, where the Solar toroidal field is greatly amplified. The PhD student will be required to do both, the theoretical and numerical analysis of the dynamical equations, that is the Navier-Stokes equation with the Lorentz force and the induction equation resulting from Maxwell's and Ohm's laws. The ultimate aim of the project is to establish the effective dynamical equations governing the magnetic field evolution in the Solar tachocline, based on the temporal and spatial scales introduced by the MBI. The next step is to solve the derived set of equations via numerical methods, which would allow to model the time evolution of the Solar magnetic field.

Requirements for candidates: should possess solid basis in the fields of mathematics and physics (candidates who graduated from physical and/or mathematical faculties are preferred). Programming skills (e.g. C, FORTRAN, PYTHON etc.). Experience in the fields of fluid dynamics and/or electrodynamics is greatly welcome.

For more information contact Dr Krzysztof Mizerski (kamiz@igf.edu.pl)

**5. Analysis of the so-called MAC waves (Magnetic-Achimedean-Coriolis) generated in the Earth's outer core by the buoyancy, magnetic and inertial forces.**

The research project is financed by the National Science Centre of Poland. The task of the student will be concerned with analysis of the so-called MAC waves (Magnetic-Achimedean-Coriolis) generated in the Earth's outer core by the buoyancy, magnetic and inertial forces. The analysis will involve both, theoretical investigations of the Navier-Stokes equations with coupled Maxwell equations and numerical simulations of the dynamics of MAC waves, with application of a code written in C language of programming by the supervisor of the project, ready-for-use and tested. The interactions of MAC waves in the "Stratified Ocean" at the top of the liquid core are known to have a substantial effect on the dynamics of the geomagnetic field. The ultimate aim of the project is to establish the influence of the MAC waves on the geomagnetic dynamo and geomagnetic field oscillations.

Requirements for candidates: should possess solid basis in the fields of mathematics and physics (candidates who graduated from physical and/or mathematical faculties are preferred). Programming skills (e.g. C, FORTRAN, PYTHON etc.). Experience in the fields of fluid dynamics and/or electrodynamics is greatly welcome.

For more information contact Dr Krzysztof Mizerski (kamiz@igf.edu.pl)

Recruitment to the positions is carried out in the form of the competition.

The deadline for the application is **19**^{th} August, 2019.

The detailed information about recruitment process, required documents and the evaluation procedure can be found at: https://www.igf.edu.pl/phdstudies.php

For additional information contact Dr Krzysztof Kochanek (kochanek@igf.edu.pl) or Anna Cygan (sn@igf.edu.pl)