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We present the first three-dimensional hybrid simulations of the evolution ofion-scale current sheets, with an investigation of the role of temperatureanisotropy and associated kinetic instabilities on the growth of the tearinginstability and particle heating. We confirm the ability of the ion cyclotronand firehose instabilities to enhance or suppress reconnection, respectively.The simulations demonstrate the emergence of persistent three-dimensionalstructures, including patchy reconnection sites and the fast growth of anarrow-band drift-kink instability, which suppresses reconnection for thincurrent sheets with weak guide fields. Potential observational signatures ofthe three-dimensional evolution of solar wind current sheets are alsodiscussed. We conclude that kinetic instabilities, arising from non-Maxwellianion populations, are significant to the evolution of three-dimensional currentsheets, and two-dimensional studies of heating rates by reconnection maytherefore over-estimate the ability of thin, ion-scale current sheets to heatthe solar wind by reconnection.

The three-dimensional evolution of ion-scale current sheets: tearing and drift-kink instabilities in the presence of proton temperature anisotropy