Research highlights and influential papers

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Dynamo Review
  • Reviews small scale and large scale dynamos
  • Saturation through magnetic helicity conservation
  • Detailed calculation of transport coefficiens using minimal tau approximation (MTA)
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    Brandenburg, A., & Subramanian, K.: 2005, ``Astrophysical magnetic fields and nonlinear dynamo theory,'' Phys. Rep. 417, 1-209 (astro-ph/0405052, ADS, PDF)

    citations
    227 on ADS

          

    Accretion disc turbulence
  • first simulation showing that turbulence can be driven by the Balbus-Hawley (or magnetorotational) instability by a magnetic field that in turn is generated by this very same turbulence
  • establishes self-consistent value for disc viscosity with Shakura-Sunyaev alpha of about 0.01
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    Brandenburg, A., Nordlund, Å., Stein, R. F., & Torkelsson, U.: 1995, ``Dynamo-generated turbulence and large-scale magnetic fields in a Keplerian shear flow,'' Astrophys. J. 446, 741-754 (ADS, PDF)

    citations
    408 on ADS

          

    Inverse cascade: resistively slow
  • establishes fundamental connection between inverse cascade in hydromagnetic turbulence and alpha effect in dynamo theory
  • unexpected: inverse cascade operates on resistive timescale
  • has to do with magnetic helicity conservation
    		•              

    Brandenburg, A.: 2001, ``The inverse cascade and nonlinear alpha-effect in simulations of isotropic helical hydromagnetic turbulence,'' Astrophys. J. 550, 824-840 (astro-ph/0006186, ADS, PDF)

    citations
    217 on ADS

          

    Mixed parity dynamo solutions
  • first simulation showing stable mixed parity solutions of nonlinear dynamo equations
  • relevant for Maunder minima type variations of solar/stellar activity
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    Brandenburg, A., Krause, F., Meinel, R., Moss, D., & Tuominen, I.: 1989, ``The stability of nonlinear dynamos and the limited role of kinematic growth rates,'' Astron. Astrophys. 213, 411-422 (ADS, PDF)

    citations
    117 on ADS

          

    Convective Dynamo Simulations with Overshoot
  • it was previously though that magnetic buoyancy removes magnetic flux before the dynamo has a chance to work
  • we find that downward pumping is at least equally strong
  • the dynamo works in the entire convection zone, but pumping concentrates magnetic flux at the bottom of the convection zone
  • relevant to the sun
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    Nordlund, Å., Brandenburg, A., Jennings, R. L., Rieutord, M., Ruokolainen, J., Stein, R. F., & Tuominen, I.: 1992, ``Dynamo action in stratified convection with overshoot,'' Astrophys. J. 392, 647-692 (ADS, PDF)

    citations
    149 on ADS

          

    Galactic Magnetism Review
  • reviews observations and theory
  • has now become standard reference
    		•              

    Beck, R., Brandenburg, A., Moss, D., Shukurov, A., & Sokoloff, D.: 1996, ``Galactic Magnetism: Recent Developments and Perspectives,'' Ann. Rev. Astron. Astrophys. 34, 155-206 (ADS, PDF)

    citations
    424 on ADS

          

    Early Universe magnetic fields
  • First to point out possibility of inverse cascade in early Universe
  • Magnetic fields from electroweak phase transition otherwise small scale
  • Horizon scale ~3 cm, corresponding to ~AU after cosmological expansion
  • Would become ~kpc with inverse cascade
    		•              

    Brandenburg, A., Enqvist, K., & Olesen, P.: 1996, ``Large-scale magnetic fields from hydromagnetic turbulence in the very early universe,'' Phys. Rev. D 54, 1291-1300 (astro-ph/9602031, ADS, PDF)

    citations
    95 on ADS

    Christensson, M., Hindmarsh, M., & Brandenburg, A.: 2001, ``Inverse cascade in decaying 3D magnetohydrodynamic turbulence,'' Phys. Rev. E 64, 056405, 1-6 (astro-ph/0011321, ADS, PDF)

    citations
    56 on ADS

    $Date: 2009-12-25 11:11:50 $, $Author: brandenb $, $Revision: 1.112 $