Abstract
Magnetic reconnection is a crucial physical process in laboratory and astrophysical plasmas. Plasma waves are believed to provide the dissipation mechanism in magnetic reconnection. In this paper we analyze the properties of low‐frequency waves in a magnetotail reconnection diffusion region with a small guide field and high β. Using the k‐filtering method on the magnetic field data measured by Cluster spacecraft, we found that low‐frequency waves in the diffusion region were highly oblique propagating mode. We compared the measured dispersion relation with theoretical ones calculated using the linear (hot) two‐fluid and Vlasov‐Maxwell theory. It is found that the observed waves in the diffusion region (with high plasma β) follow the dispersion relation of the Alfvén‐Whistler wave mode. Comparisons with previous simulations and observational results are also discussed.
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