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      Radial evolution of cross helicity at low and high latitudes in the solar wind

      Breech, Ben; Matthaeus, William H.; Minnie, J.; Oughton, Sean; Parhi, S.; Bieber, J.W.; Bavassano, B.
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      Breech, B., Matthaecus, W. H., Minnie, J., Oughton, S., Parhi, S.,…, Bavassano, B. (2005). In Proceedings of the Solar Wind 11 / SOHO 16, Connecting Sun and Heliosphere Conference (ESA SP-592).
      Permanent Research Commons link: https://hdl.handle.net/10289/8595
      Abstract
      We employ a turbulence transport theory to the radial evolution of the solar wind at both low and high latitudes. The theory includes cross helicity, magnetohydrodynamic (MHD) turbulence, and driving by shear and pickup ions. The radial decrease of cross helicity, observed in both low and high latitudes, can be accounted for by including sufficient shear driving to overcome the tendency of MHD turbulence to produce Alfvénic states. The shear driving is weaker at high latitudes leading to a slower evolution. Model results are compared with observations from Ulysses and Voyager.
      Date
      2005
      Type
      Conference Contribution
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      • Computing and Mathematical Sciences Papers [1454]
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