Wave properties in the magnetic reconnection diffusion region with high β: Application of the k-filtering method to Cluster multispacecraft data

Details Wave properties in the magnetic reconnection diffusion region with high β: Application of the k-filtering method to Cluster multispacecraft data Wave properties in the magnetic reconnection diffusion region with high β: Application of the k-filtering method to Cluster multispacecraft data

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010jgra..11512211h&link_type=abstract

Journal of Geophysical Research, Volume 115, Issue A12, CiteID A12211

Physics

Plasma Physics

1

Space Plasma Physics: Magnetic Reconnection (2723, 7526), Space Plasma Physics: Kinetic And Mhd Theory, Magnetospheric Physics: Magnetotail, Magnetospheric Physics: Plasma Waves And Instabilities (2471)

Scientific paper

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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