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Wavevector anisotropy of ion-scale plasma turbulence is studied at various values of ion beta.Two complementary methods are used. One is multi-point measurementsof magnetic field in the near-Earth solar wind as provided by the Cluster spacecraft mission,and the other is hybrid numerical simulation of two-dimensional plasma turbulence.Both methods demonstratethat the wavevector anisotropy is reduced with increasing values of ion beta.Furthermore, the numerical simulation studyshows the existence of a scaling law between ion beta andthe wavevector anisotropy  of the fluctuating magnetic fieldthat is controlled  by the thermal or hybrid particle-in-cell simulation noise.Likewise, there is weak evidence that the power-law scalingcan be extended to the turbulent fluctuating cascade.This fact can be used to construct a diagnostic tool to determineor to constrain ion beta using multi-point magnetic field measurements in space

Wavevector anisotropy of plasma turbulence at ion kinetic scales: solar wind observations and hybrid simulations