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Motivated by recent observations of distinct parallel and perpendicularsignatures in magnetic helicity measurements segregated by wave period andangle between the local magnetic field and the solar wind velocity, this paperundertakes a comparison of three intervals of \emph{Ulysses} data withsynthetic time series generated from a physically motivated turbulence model.From these comparisons, it is hypothesized that the observed signatures resultfrom a perpendicular cascade of \Alfvenic fluctuations and a local,non-turbulent population of ion cyclotron or whistler waves generated bytemperature anisotropy instabilities. By constraining the model's freeparameters through comparison to \emph{in situ} data, it is found that, onaverage, $ \sim 95\%$ of the power near dissipative scales is contained in aperpendicular \Alfvenic cascade and that the parallel fluctuations arepropagating nearly unidirectionally. The effects of aliasing on magnetichelicity measurements are considered and shown to be significant near theNyquist frequency.

astrophysical journal/the astrophysical journal

Physical Interpretation of the Angle Dependent Magnetic Helicity  Spectrum in the Solar Wind: The Nature of Turbulent Fluctuations near the  Proton Gyroradius Scale