Anisotropy of Solar Wind Turbulence in the Inner Heliosphere at Kinetic Scales: PSP Observations

The anisotropy of solar wind turbulence is a critical issue in understanding the physics energy transfer between scales and conversion fields particles heliosphere. Using measurement \emph{Parker Solar Probe} (\emph{PSP}), we present an observation at kinetic slow, Alfv\'enic, inner \textbf{The magnetic compressibility behaves as expected for Alfv\'enic below ion scale.} A steepened transition range found inertial ranges all directions with respect to local background field direction. $k_\perp \gg k_\parallel$ evident both ranges, power $P_\perp/P_\parallel > 10$ leading over that being stronger than 1 au. spectral index varies from $\alpha_{t\parallel}=-5.7\pm 1.0$ $\alpha_{t\perp}=-3.7\pm 0.3$ $\alpha_{k\parallel}=-3.12\pm 0.22$ $\alpha_{k\perp}=-2.57\pm 0.09$ range. corresponding wavevector has scaling $k_\parallel \sim k_\perp^{0.71\pm 0.17}$ range, changes k_\perp^{0.38\pm 0.09}$ consistent sub-ion scales.