Chandrasekhar–Kendall functions in astrophysical dynamos
1NORDITA, AlbaNova University Center, Roslagstullsbacken 23, SE 10691 Stockholm, Sweden
2Department of Astronomy, Stockholm University, SE 10691 Stockholm, Sweden
Abstract. Some of the contributions of Chandrasekhar to the field of magnetohydrodynamics are
highlighted. Particular emphasis is placed on the Chandrasekhar–Kendall functions that allow a
decomposition of a vector field into right- and left-handed contributions. Magnetic energy spectra
of both contributions are shown for a new set of helically forced simulations at resolutions higher
than what has been available so far. For a forcing function with positive helicity, these simulations
show a forward cascade of the right-handed contributions to the magnetic field and nonlocal inverse
transfer for the left-handed contributions. The speed of inverse transfer is shown to decrease with
increasing value of the magnetic Reynolds number.
Keywords. Magnetohydrodynamics; dynamos; turbulence.
PACS Nos 52.30.-q; 52.65.Kj; 47.11.+j; 47.27.Ak; 47.65.+a; 95.30.Qd