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Alfv\'en vortex is a multi-scale nonlinear structure which contributes tointermittency of turbulence. Despite previous explorations mostly on thespatial properties of the Alfv\'en vortex (i.e., scale, orientation, andmotion), the plasma characteristics within the Alfv\'en vortex are unknown.Moreover, the connection between the plasma energization and the Alfv\'envortex still remains unclear. Based on high resolution in-situ measurement fromthe Magnetospheric Multiscale (MMS) mission, we report for the first time,distinctive plasma features within an Alfv\'en vortex. This Alfv\'en vortex isidentified to be two-dimensional ($k_{\bot} \gg k_{\|}$) quasi-monopole with aradius of ~10 proton gyroscales. Its magnetic fluctuations $\delta B_{\bot}$are anti correlated with velocity fluctuations $\delta V_{\bot}$, thus theparallel current density $j_{\|}$ and flow vorticity $\omega_{\|}$ areanti-aligned. In different part of the vortex (i.e., edge, middle, center), theion and electron temperatures are found to be quite different and they behavein the reverse trend: the ion temperature variations are correlated with$j_{\|}$, while the electron temperature variations are correlated with$\omega_{\|}$. Furthermore, the temperature anisotropies, together with thenon-Maxwellian kinetic effects, exhibit strong enhancement at peaks of$|\omega_{\|}| (|j_{\|}|)$ within the vortex. Comparison between observationsand numerical/theoretical results are made. In addition, the energy-conversionchannels and the compressibility associated with the Alfv\'en vortex arediscussed. These results may help to understand the link between coherentvortex structures and the kinetic processes, which determines how turbulenceenergy dissipate in the weakly-collisional space plasmas.

Magnetospheric Multiscale Observation of Kinetic Signatures in the Alfv\'en Vortex