Are Electron Distributions Associated with Reconnection Electrostatically Unstable and do they lead to Electron Holes?

Details Are Electron Distributions Associated with Reconnection Electrostatically Unstable and do they lead to Electron Holes? Are Electron Distributions Associated with Reconnection Electrostatically Unstable and do they lead to Electron Holes?

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007agufmsm53b1280g&link_type=abstract

American Geophysical Union, Fall Meeting 2007, abstract #SM53B-1280

Physics

7835 Magnetic Reconnection (2723, 7526), 7839 Nonlinear Phenomena (4400, 6944), 7845 Particle Acceleration, 7863 Turbulence (4490)

Scientific paper

Model electron distributions arising in the late stages of 2-D PIC simulations1 of magnetic reconnection with a guide field are used to initialize 1-D and 2-D electrostatic Vlasov simulations, which are oriented to include the direction parallel to the (local) magnetic field. Transient electron holes are found to develop near the separatrix through a electron-ion (e.g., Buneman) instability. Restriction of the destabilizing current to a narrow sheet perpendicular to \mathbf{B} reduces the Buneman growth rate, possibly leading to more stable holes. Near the X-point, electron-electron two-stream instabilities can produce quasi-stable electron holes. These first-generation holes can modify the electron-ion interaction resulting in a second generation of holes, with a variety of subsequent hole-hole interactions that depend on the details of the initial distributions. When the holes are shallow and well-separated they can be analyzed using stationary solutions2 based on the condition eφ/Te \ll 1. *Research supported by DOE, NASA, and NSF. 1P.~L.~Pritchett, Phys.~Plasmas, 12, 062301 (2005). 2M.~V.~Goldman, D.~L.~Newman, and A.~Mangeney, Phys.~Rev.~Lett., in press, (2007).

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