|
Home page Hans
Goedbloed Prof. Dr. J.P. Goedbloed Advisor, DIFFER, TU/e Science Park, De Zaale 20, 5612AJ
Eindhoven, the Netherlands Professor emeritus Theoretical Plasma Physics, Physics and Astronomy Department, Utrecht University
Tel.: +31 (0) 40 333 4999 http://www.differ.nl/users/goedbloed
https://orcid.org/0000-0002-8794-472X
. . . . (charcoal by Henk van der Vorst)
New:
The Super-Alfv'enic Rotational Instability in accretion disks about black holes
· Authors: Hans Goedbloed and Rony Keppens (Astrophysical Journal Supplement Series, 259:65 (41 pp), 2022 April) arXiv:2201.1151 [astro-ph.HE] (preprint)
ApJS 259:65 (published version)
Black holes are surrounded by disks consisting of hot magnetized plasma. Those disks would forever rotate at Keplerian velocity if not some anomalously large dissipation mechanism would brake the rotation and cause the plasma to fall into the black hole. For thirty years now that mechanism was ascribed to the Magneto-Rotational Instability (MRI) which would produce vertical and horizontal perturbations of the disk, but conserve the rotational symmetry (m = 0). Breaking that symmetry required breaking away from standard solution techniques by delving deeply into singular analysis. That search was facilitated by the two-year pandemic seclusion into the study resulting in the discovery of a large class of non-axisymmetric solutions that have all requisite properties for turbulent excitation of accretion. They originate from the interaction of the co- and the counter-rotating Alfv'en continuous spectra producing quasi-discrete instabilities at the Doppler frequency. They are spatially highly localized in all three directions and their frequencies densely cover large two dimensional stretches of the complex frequency plane. Most important, they require a tiny amount of external energy (of the order of the machine accuracy used in the calculations) to excite them. We have termed them Super-Alfv'enic Rotational Instabilities (SARIs) and conjecture that these SARIs, rather than the MRIs, excite the turbulence needed for accretion of magnetized plasma onto a black hole.
Latest textbook
Magnetohydrodynamics of Laboratory and Astrophysical Plasmas · Magnetohydrodynamics of
Laboratory and Astrophysical Plasmas, by Hans Goedbloed, Rony Keppens, and Stefaan Poedts (Cambridge University Press, 2019) Rony Keppens (home page)
Stefaan Poedts (home page)
With 90% of visible matter in the Universe existing in the plasma state, an understanding of magnetohydrodynamics is essential for anyone looking to understand solar and astrophysical processes, from stars to accretion discs and galaxies; as well as laboratory applications focused on harnessing controlled fusion energy. This introduction to magnetohydrodynamics brings together the theory of plasma behaviour with advanced topics including the applications of plasma physics to thermonuclear fusion and plasma astrophysics. Topics covered include streaming and toroidal plasmas, nonlinear dynamics, modern computational techniques, incompressible plasma turbulence and extreme transonic and relativistic plasma flows. The numerical techniques needed to apply magnetohydrodynamics are explained, allowing the reader to move from theory to application and exploit the latest algorithmic advances. Bringing together two previous volumes: Principles of Magnetohydrodynamics and Advanced Magnetohydrodynamics, and completely updated with new examples, insights and applications, this volume constitutes a comprehensive reference for students and researchers interested in plasma physics, astrophysics and thermonuclear fusion.
CONTENTS Part I. Plasma Physics Preliminaries: 1. Introduction; 2. Elements of plasma physics; 3. 'Derivation' of the macroscopic equations; Part II. Basic Magnetohydrodynamics: 4. The MHD model; 5. Waves and characteristics; 6. Spectral theory; Part III. Standard Model Applications: 7. Waves and instabilities on inhomogeneous plasmas; 8. Magnetic structures and dynamics of the solar system; 9. Cylindrical plasmas; 10. Initial value problem and wave damping; 11. Resonant absorption and wave heating; Part IV. Flow and Dissipation: 12. Waves and instabilities of stationary plasmas; 13. Shear flow and rotation; 14. Resistive plasma dynamics; 15. Computational linear MHD; Part V. Toroidal Geometry: 16. Static equilibrium of toroidal plasmas; 17. Linear dynamics of static toroidal plasmas; 18. Linear dynamics of toroidal plasmas with flow; Part VI. Nonlinear Dynamics: 19. Turbulence in incompressible magneto-fluids; 20. Computational nonlinear MHD; 21. Transonic MHD flows and shocks; 22. Ideal MHD in special relativity; Appendices. ISBN 9781107123922 (hardback);
https://doi.org/10.1017/9781316403679 (electronic version).
·
A workshop on "Magnetohydrodynamics: Physics for the 21 Century" was held 11-15 October 2021 at Leiden University: Workshop-Lorentz Center
· Errata on
Magnetohydrodynamics of Laboratory and Astrophysical Plasmas: ErrataMagnetohydrodynamics.pdf
(updated 23 March 2021) · Advanced Magnetohydrodynamics;
with Applications to Laboratory and Astrophysical Plasmas, by Hans Goedbloed, Rony Keppens, and
Stefaan Poedts (Cambridge University Press, 2010) Rony Keppens (home page)
Stefaan Poedts (home page)
Following on from the companion volume Principles of Magnetohydrodynamics, this textbook analyzes the applications of plasma physics to thermonuclear fusion and plasma astrophysics from the single viewpoint of MHD. This approach turns out to be ever more powerful when applied to streaming plasmas (the vast majority of visible matter in the Universe), toroidal plasmas (the most promising approach to fusion energy), and nonlinear dynamics (where it all comes together with modern computational techniques and extreme transonic and relativistic plasma flows). The textbook interweaves theory and explicit calculations of waves and instabilities of streaming plasmas in complex magnetic geometries. It is ideally suited to advanced undergraduate and graduate courses in plasma physics and astrophysics.
CONTENTS Part III. Flow and Dissipation: 12. Waves and instabilities of stationary plasmas; 13. Shear flow and rotation; 14. Resistive plasma dynamics; 15. Computational linear MHD; Part IV. Toroidal Plasmas: 16. Static equilibrium of toroidal plasmas; 17. Linear dynamics of static toroidal plasmas; 18. Linear dynamics of stationary toroidal plasmas; Part V. Nonlinear Dynamics: 19. Computational nonlinear MHD; 20. Transonic MHD flows and shocks; 21. Ideal MHD in special relativity; Appendices. ISBN 9780521879576 (hardback);
ISBN 9780521705240 (paperback).
· A book presentation was held at Rijnhuizen on 11 June 2010, with musical accompaniment on the viola da gamba: Ralph Rousseau (home page)
·
A workshop on "Advanced Magnetohydrodynamics" was held 11-15 April 2011 at Leiden University: Workshop-Lorentz Center
· Errata on
Advanced Magnetohydrodynamics: ErrataAdvMHD.pdf
(updated 17 May 2017) Principles
of Magnetohydrodynamics ·
Principles of Magnetohydrodynamics; with Applications to Laboratory
and Astrophysical Plasmas, by
Hans Goedbloed and Stefaan Poedts (Cambridge University Press, 2004): This
textbook provides a modern and accessible introduction to
magnetohydrodynamics (MHD). It describes the two main applications of plasma physics
-- laboratory research on thermo-nuclear fusion energy and
plasma-astrophysics of the solar system, stars and accretion disks -- from
the single viewpoint of MHD. This approach provides effective methods and
insights for the interpretation of plasma phenomena on virtually all scales,
from the laboratory to the Universe. It equips the reader with the necessary
tools to understand the complexities of plasma dynamics in extended magnetic
structures. The classical MHD model is developed in detail without omitting
steps in the derivations, and problems are included at the end of each
chapter. This text is ideal for senior-level undergraduate and graduate
courses in plasma physics and astrophysics.
CONTENTS Part I. Plasma Physics Preliminaries: 1. Introduction; 2. Elements of plasma physics; 3. 'Derivation' of the macroscopic equations; Part II. Basic Magnetohydrodynamics: 4. The MHD model; 5. Waves and characteristics; 6. Spectral theory; 7. Waves and instabilities on inhomogeneous plasmas; 8. Magnetic structures and dynamics; 9. Cylindrical plasmas; 10. Initial value problem and wave damping; 11. Resonant absorption and wave heating; Appendices. ISBN 0521 6 2347 2 (hardback);
ISBN 0 521 62607 2 (paperback).
· Book review by Prof. Eugene Parker: J. Fluid Mechanics (2004), 519, p. 377-379. ·
A workshop with the same name was held 21-24 March 2005 at Leiden
University: Lorentz Center
· Errata on
Principles of Magnetohydrodynamics: ErrataPrMHD.pdf
(updated 30 Nov 2018)
[LECTURES] [PUBLICATIONS] [ MISCELLANEOUS] · Lectures at Astronomy Department, University of Sao Paulo, March-May 2007: AdvancedMHD.pdf
(Description of the course) MHD1.pdf (Introduction) MHD2.pdf (Elements of
plasma physics) MHD4.pdf (The MHD model) MHD5.pdf (Waves and
characteristics) MHD6.pdf (Spectral
theory) MHD7.pdf (Waves and instabilities
in inhomogeneous plasmas) MHD8.pdf (Magnetic
structures and dynamics) MHDF.pdf (Flow: Waves and
instabilities in stationary plasmas) MHDR.pdf (Resistive
plasmas) MHDT.pdf (Toroidal
plasmas) MHDS.pdf (Transonic MHD
flows and shocks) MHDapp.pdf (Appendices:
Vector identies and Tables) RT.tar.bz2 (Exercise of
MHD7: Fortran files for Rayleigh-Taylor instability) Solo.tar.bz2
(Exercise of MHDT: Fortran files for Soloviev equilibrium) · Publications Goedbloed et al.: Publications.pdf
(updated 30 March 2022) · "Interview met Hans Goedbloed" (in Dutch), Interkom nr. 3, Zomer 2011: · "Elektrische en magnetische velden" (in Dutch), Interkom nr. 4, Herfst 2014: · "Wetenschappelijke integriteit" (in Dutch), Interkom nr. 2, Lente 2015: · "Herinneringen aan Piet van der Laan (1935-2017)" (in Dutch), Interkom nr. 1, Voorjaar 2017: · "Differ works at home nr. 7", 20 May 2020: · "Gelukwens voor Richard van de Sanden" (in Dutch), 3 November 2020: · "Gedachten bij het boek Denken is verrukkelijk" (in Dutch), Interkom nr. 3, Zomer 2021: |
