Turbulence is ubiquitously observed in nearly collisionless heliospheric plasmas , including the solar wind and corona and the Earth ’ s magnetosphere .
Understanding the collisionless mechanisms responsible for the energy transfer from the turbulent fluctuations to the particles is a frontier in kinetic turbulence research .
Collisionless energy transfer from the turbulence to the particles can take place reversibly , resulting in non-thermal energy in the particle velocity distribution functions ( VDFs ) before eventual collisional thermalization is realized .
Exploiting the information contained in the fluctuations in the VDFs is valuable .
Here we apply a recently developed method based on VDFs , the field-particle correlation technique , to a \beta = 1 , solar-wind-like , low-frequency Alfvénic turbulence simulation with well resolved phase space to identify the field-particle energy transfer in velocity space .
The field-particle correlations reveal that the energy transfer , mediated by the parallel electric field , results in significant structuring of the ion and electron VDFs in the direction parallel to the magnetic field .
Fourier modes representing the length scales between the ion and electron gyroradii show that energy transfer is resonant in nature , localized in velocity space to the Landau resonances for each Fourier mode .
The energy transfer closely follows the Landau resonant velocities with varying perpendicular wavenumber k _ { \perp } and plasma \beta .
This resonant signature , consistent with Landau damping , is observed in all diagnosed Fourier modes that cover the dissipation range of the simulation .