Libor ŠachlAcademic profile

Curriculum vitae

Academic positions, education, publications and research activities.

Positions Education Stays abroad Publications Presentations Posters Reports Grants and projects Student supervision Teaching activities Workshops and summer schools Skills

Positions

Since 2020

Postdoctoral researcher

Charles University, Faculty of Mathematics and Physics, Department of Geophysics, Czech Republic.

Education

2011–2020

Ph.D. in Geophysics

Charles University, Faculty of Mathematics and Physics, Department of Geophysics, Czech Republic.

Thesis: Modelling of global ocean circulation and ocean-induced magnetic field
Supervisor: Prof. RNDr. Zdeněk Martinec, DrSc.
Defended on 20 September 2020.

2009–2011

MSc. in Geophysics

Charles University, Faculty of Mathematics and Physics, Department of Geophysics, Czech Republic.

Thesis: Ray-based Born approximation
Supervisor: RNDr. Luděk Klimeš, DrSc.
Defended on 20 September 2011; graduated with honors.

2006–2009

Bachelor studies

Charles University, Faculty of Mathematics and Physics, Czech Republic.

Thesis: Termální konvekce jako nelineární dynamický systém: vliv radiačního přenosu tepla (Thermal convection as a nonlinear dynamical system: influence of a heat transfer by radiation)
Supervisor: Doc. RNDr. Ctirad Matyska, DrSc.
Defended on 23 June 2009.

Stays abroad

2013–2016

Dublin Institute for Advanced Studies

Geophysics Section, School of Cosmic Physics, Dublin, Ireland.
Ph.D. student.

Publications

  • Šachl, L., J. Kvorka, O. Čadek and J. Velímský, Magnetic field induced by convective flow in Ganymede’s subsurface ocean. J. Geophys. Res.: Planets, 131(4), e2025JE009456, 2026.
  • Kvorka, J., O. Čadek, L. Šachl, and J. Velímský, Convective flow in Ganymede's subsurface ocean: Implications for the induced magnetic field and topography. Icarus, 444, 116807, 2026.
  • Šachl, L., J. Kvorka, O. Čadek and J. Velímský, Magnetic field induced by convective flow in Europa’s subsurface ocean. Icarus, 429, 116375, 2025.
  • Šachl, L., O., Knopp and J., Velímský, Electrical conductivity of the suboceanic upper mantle constrained by satellite-derived tidal magnetic fields: 3-D inversion, validation and interpretation. Geophys. J. Int., 238, 1254–1268, 2024.
  • Velímský J. and L. Šachl, Sensitivity of M2 tidal magnetic signals to seasonal and spatial variations of ocean electric conductivity. Phil. Trans. R. Soc. A, 382(2286), 20240079, 2024.
  • Šachl L. , J. Velímský, J. Fullea and Z. Martinec, Inversion of the satellite observations of the tidally induced magnetic field in terms of 3-D upper-mantle electrical conductivity: Method and synthetic tests. Geophys. J. Int., 229(3):2115-2132, 2022.
  • Martinec Z., J. Fullea, J. Velímský and L. Šachl, A new integrated geophysical-petrological global 3-D model of upper-mantle electrical conductivity validated by the Swarm M2 tidal magnetic field. Geophys. J. Int., 226(2):742-763, 2021.
  • Sajjadi S., Z. Martinec, P. Prendergast, J. Hagedoorn and L. Šachl, The stability criterion for downward continuation of surface gravity data with various spatial resolutions over Ireland. Stud. Geophys. Geod., 65:219-234, 2021.
  • Šachl L., D. Einšpigel and Z. Martinec, Simple numerical tests for ocean tidal models. Stud. Geophys. Geod., 64:202-240, 2020.
  • Sajjadi S., Z. Martinec, P. Prendergast, J. Hagedoorn, L. Šachl, P. Readman, E. Robin, B. O’Reilly and C. Horan, The unification of gravity data for Ireland-Northern Ireland. Lead. Edge, 39(2):135-143, 2020.
  • Šachl L., Z. Martinec, J. Velímský, C. Irrgang, J. Petereit, J. Saynisch, D. Einšpigel and N. R. Schnepf, Modelling of electromagnetic signatures of global ocean circulation: physical approximations and numerical issues. Earth Planets Space, 71(1):58, 2019.
  • Velímský J., L. Šachl and Z. Martinec, The global toroidal magnetic field generated in the Earth’s oceans. Earth Planet. Sc. Lett., 509:47–54, 2019.
  • Velímský J., A. Grayver, A. Kuvshinov and L. Šachl, On the modelling of M2 tidal magnetic signatures: Effects of physical approximations and numerical resolution. Earth Planets Space, 70(1):70–192, 2018.
  • Martinec Z., J. Velímský, R. Haagmans and L. Šachl, A two-step along-track spectral analysis for estimating the magnetic signals of magnetospheric ring current from Swarm data. Geophys. J. Int., 212(2):1201–1217, 2017.
  • Šachl L., Validation of 3-D synthetic seismograms based on the ray-Born approximation. Stud. Geophys. Geod., 57(1): 84-102, 2013.

Presentations

  • Šachl L., J. Kvorka, O. Čadek, J. Velímský, Magnetic field induced by convective flow in Ganymede’s subsurface ocean. 4th Outer planet moon-magnetosphere interaction workshop, April 2, 2025.
  • Šachl L. and J. Velímský, Three-dimensional Upper-mantle Conductivity Constrained by Tidal Magnetic Fields. AGU24 Annual Meeting, Washington, December 9, 2024, invited talk.
  • Šachl L., J. Kvorka, O. Čadek and J. Velímský, Magnetic field induced by convective flow in Europa’s subsurface ocean. EM Induction Workshop (EMIW), Beppu, September 12, 2024.
  • Šachl L., J. Velímský and O. Knopp, Inversion of the satellite-observed tidal magnetic fields in terms of three-dimensional upper-mantle electrical conductivity. IAGA-IASPEI, virtual conference, August 25, 2021.
  • Šachl L., J. Velímský and J. Fullea, Inversion of the satellite observations of the tidally induced magnetic field in terms of 3-D upper-mantle electrical conductivity: Method and synthetic tests. Pico presentation, EGU General Assembly, virtual conference, April 27, 2021.
  • Šachl L., Oceans and their numerical modelling. Fyzikální čtvrtky, Prague, March 5, 2020.
  • Šachl L., Z. Martinec and D. Einšpigel, Ocean model LSOMG: Development and applications. Geophysical Doctoral Day, Prague, May 31, 2017.
  • Šachl L., Z. Martinec and D. Einšpigel, Ocean model LSOMG: Development and applications. Irish Geological Research Meeting, Galway, February 20, 2016.
  • Šachl L. and Z. Martinec, LSG Ocean Model – Introduction and Preliminary Results. Week of Doctoral Students, Prague, June 6, 2013.
  • Šachl L. and Z. Martinec, Introduction to Ocean Modelling. Week of Doctoral Students, Prague, May 31, 2012.

Posters

  • Šachl, L., Velímský, J., A comparison of 3-D upper-mantle conductivity models obtained by inversions of satellite-detected tidal magnetic signals, Dragon 6 Mid-term Symposium, June, 2026.
  • Šachl, L., Velímský, J., Kvorka, J., Can we use the ocean-induced magnetic field to reconstruct the flow in subsurface oceans on icy moons?, EGU, May, 2026.
  • Šachl L., J. Kvorka, O. Čadek, J. Velímský, Magnetic field induced by convective flow in Europa’s subsurface ocean. AGU24 Annual Meeting, Washington, December 9, 2024.
  • Šachl L. and J. Velímský, Revisiting the 3-D suboceanic upper mantle conductivity constrained by tidal magnetic fields. Electromagnetic Induction Workshop (EMIW), Beppu, September 11, 2024.
  • Kvorka J., L. Šachl, O. Čadek and J. Velímský, Magnetic field induced by convective flow in Europa’s subsurface ocean. Europlanet Science Congress (EPSC), Berlin, September 9, 2024.
  • Velímský J., L. Šachl and O. Knopp, Deep geomagnetic sounding by Sq variations in Europe. Electromagnetic Induction Workshop (EMIW), September 17, 2022.
  • Šachl L., O. Knopp and J. Velímský, Validation and interpretation of the 3-D upper-mantle electrical conductivity reconstructed from the satellite-observed tidal magnetic fields. ESA Living Planet Symposium, May 23, 2022.
  • Šachl L., J. Velímský, Z. Martinec and J. Fullea, Inversion of the satellite-observed tidal magnetic fields in terms of 3-D upper-mantle electrical conductivity. 5th Users’ Conference of IT4Innovations, virtual conference, November 9, 2021.
  • Šachl L. and Z. Martinec, Global singularity-free grids in ocean modelling. EGU General Assembly, Vienna, April 11, 2019.
  • Šachl L., D. Einšpigel, A. Grayver, C. Irrgang, A. Kuvshinov, Z. Martinec, J. Petereit, J. Saynish, N. Schnepf and J. Velímský, Benchmark study of magnetic induction codes forced by ocean electric currents. EGU General Assembly, Vienna, April 25, 2017.
  • Velímský J., D. Einšpigel, A. Grayver, C. Irrgang, A. Kuvshinov, Z. Martinec, J. Petereit, L. Šachl, J. Saynisch and R. Tyler, Benchmark study of magnetic induction codes forced by ocean tides. EGU General Assembly, Vienna, April 25, 2017.
  • Šachl L., D. Einšpigel, Z. Martinec and J. Velímský, Computations of wind-driven ocean-induced magnetic fields. EGU General Assembly, Vienna, April 20, 2016.
  • Šachl L. and Z. Martinec, Development of ocean model LSOMG. IUGG General Assembly, Prague, June 27, 2015.
  • Šachl L. and Z. Martinec, Development of ocean model LSOMG. EGU General Assembly, Vienna, April 15, 2015.
  • Einšpigel D., J. Velímský, Z. Martinec and L. Šachl, Magnetic signals generated by ocean flow in Swarm satellite data: prediction and observation. EGU General Assembly, Vienna, April 15, 2015.
  • Šachl L., D. Einšpigel and Z. Martinec, A benchmark study for two barotropic ocean model codes. EGU General Assembly, Vienna, April 28, 2014.
  • Šachl L., Seismogram Improvement Using the Born Aproximation. EAGE Conference & Exhibition incorporating SPE EUROPEC, Vienna, May, 2011.

Reports

  • Velímský J., Z. Martinec, L. Šachl, D. Einšpigel and L. Hanyk, Magnetic Signatures of Barotropic and Baroclinic Flows in Swarm Data. ESA Study Contract Report, 4000109562/14/NL/CBi, 2016. URL Report PDF.
  • Šachl L., Born and ray-theory seismograms in 2D heterogeneous isotropic models. Seismic Waves in Complex 3–D Structures, Report 22, Dep. Geophys., Charles Univ., Prague, 83-112, 2012. URL Report PDF.
  • Šachl L., Effect of caustics on the ray-based Born approximation. Seismic Waves in Complex 3–D Structures, Report 22, Dep. Geophys., Charles Univ., Prague, 55-82, 2012. URL Report PDF.
  • Šachl L., 2D computations of 3D synthetic seismograms using the ray-based Born approximation in heterogenous background model P1. Seismic Waves in Complex 3–D Structures, Report 21, Dep. Geophys., Charles Univ., Prague, 99-114, 2011. URL Report PDF.
  • Šachl L., 3D and 2D computations of 3D synthetic seismograms using the ray-based Born approximation in simple models. Seismic Waves in Complex 3–D Structures, Report 21, Dep. Geophys., Charles Univ., Prague, 69-98, 2011. URL Report PDF.

Grants and projects

  • 2023-2026 Towards the understanding of the subsurface planetary oceans using ocean-induced magnetic field, ESA Open Ideas, 4000141625/23/NL/MGu/my, primary investigator.
  • 2020-2022 Three-dimensional electrical conductivity in the Earth’s mantle recovered from geomagnetic variations of magnetospheric, ionospheric, and tidal origin, Grant Agency of the Czech Republic, P210-20-07378S, team member.
  • 2017-2019 Ocean flows and their magnetic signatures on global and regional scales, Grant Agency of the Czech Republic, P210-17-03689S, team member.
  • 2014-2016 Magnetic Signatures of Barotropic and Baroclinic Ocean Flows in Swarm Data, European Space Agency Contract No. 4000109562/14/NL/CBi, team member.
  • 2010-2012 New trends in ray methods - part 4, Grant Agency of the Czech Republic, P210-10-0736, team member.
  • 2009-2011 Free oscillations and viscoelastic tides of selfgraviting planetary bodies, pseudospectral approach, Charles University Grant Agency, GAUK 141610, team member.

Student supervision

  • 2022 Hronek M., Vizualizace oceánské cirkulace pomocí programu ParaView. Student faculty grant.

Teaching activities

  • 2020-2025 Geomagnetism and geoelectricity (exercises), Charles University, Faculty of Mathematics and Physics, Czech Republic
  • 2011-2013 Programming for physicists (exercises), Charles University, Faculty of Mathematics and Physics, Czech Republic

Workshops and summer schools

  • 8/2018 Waves in Flows, Prague, Czech Republic
  • 9/2014 Physics of the Ocean, Bad Honnef, Germany
  • 8/2014 ESA Earth Observation Summer School, ESA-ESRIN, Frascati
  • 6/2010 Seismic waves in laterally inhomogeneous media VII, Teplá, Czech Republic

Skills

  • Languages: native Czech; English, C1.
  • Programming and tools: Fortran 95, FORTRAN 77, Matlab, C, C++, LaTeX, HTML, CSS.
  • Driving licence held since 2006.