caa a22 4500 445346523 CHVBK 20180317142830.0 cr unu---uuuuu 170323e20110301xx s 000 0 eng 10.1007/s11207-010-9683-4 doi (NATIONALLICENCE)springer-10.1007/s11207-010-9683-4 Cross Helicity and Turbulent Magnetic Diffusivity intheSolar Convection Zone [Elektronische Daten] [G. Rüdiger, L. Kitchatinov, A. Brandenburg] In a density-stratified turbulent medium, the cross helicity 〈u′⋅B′〉 is considered as a result of the interaction of the velocity fluctuations and a large-scale magnetic field. By means of a quasilinear theory and by numerical simulations, we find the cross helicity and the mean vertical magnetic field to be anti-correlated. In the high-conductivity limit the ratio of the helicity and the mean magnetic field equals the ratio of the magnetic eddy diffusivity and the (known) density scale height. The result can be used to predict that the cross helicity at the solar surface will exceed the value of 1gauss km s−1. Its sign is anti-correlated to that of the radial mean magnetic field. Alternatively, we can use our result to determine the value of the turbulent magnetic diffusivity from observations of the cross helicity. Springer Science+Business Media B.V., 2010 Magnetohydrodynamics (MHD) nationallicence Sun: magnetic field nationallicence Rüdiger G. Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482, Potsdam, Germany aut Kitchatinov L. Institute for Solar-Terrestrial Physics, P.O. Box 291, 664033, Irkutsk, Russia aut Brandenburg A. Nordita, AlbaNova University Center, Roslagstullsbacken 23, 10691, Stockholm, Sweden aut Solar Physics Springer Netherlands 269/1(2011-03-01), 3-12 0038-0938 269:1<3 2011 269 11207 https://doi.org/10.1007/s11207-010-9683-4 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11207-010-9683-4 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Rüdiger G. Astrophysikalisches Institut Potsdam, An der Sternwarte 16, 14482, Potsdam, Germany aut NATIONALLICENCE 700 1- Kitchatinov L. Institute for Solar-Terrestrial Physics, P.O. Box 291, 664033, Irkutsk, Russia aut NATIONALLICENCE 700 1- Brandenburg A. Nordita, AlbaNova University Center, Roslagstullsbacken 23, 10691, Stockholm, Sweden aut NATIONALLICENCE 773 0- Solar Physics Springer Netherlands 269/1(2011-03-01), 3-12 0038-0938 269:1<3 2011 269 11207 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer