Directory:
    ${PENCIL_HOME}/samples/testfield_xz
SVN Id:
    $Id$
Maintainer:
    Axel Brandenburg <brandenb/nordita[dot]org>
Added:
     6-Mar-2013
Status:
    New reference data since 6 March 2013.
Recommended resolution:
    32x32x32 with etatest=5e-3 works fine.
Comments:
    This procedure allows the full alpha and eta tensors to be calculated.
    Different test fields can be used. Note however that the result is
    in general wavenumber dependent. The present example is for the
    homogeneous helical turbulence with large-scale uniform shear.
    IDL> .r p
References:
    Brandenburg, A.: 2005, ``Turbulence and its parametrization in
       accretion discs,'' Astron. Nachr. 326, 787-797
    Brandenburg, A., Radler, K.-H., Rheinhardt, M., & Kapyla, P. J.:
       2008, ``Magnetic diffusivity tensor and dynamo effects in
       rotating and shearing turbulence,'' Astrophys. J. 676, 740-751
    Hubbard, A., Rheinhardt, M. & Brandenburg, A.: 2011, ``The
       fratricide of $\alpha\Omega$ dynamos by their alpha^2 siblings,''
       Astron. Astrophys. 535, A48