Other
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005agufmsm21c..05g&link_type=abstract
American Geophysical Union, Fall Meeting 2005, abstract #SM21C-05
Other
2723 Magnetic Reconnection (7526, 7835), 2753 Numerical Modeling, 2772 Plasma Waves And Instabilities (2471), 7829 Kinetic Waves And Instabilities, 7835 Magnetic Reconnection (2723, 7526)
Scientific paper
Electron holes have been linked to magnetic reconnection in recent EM simulations1 initiated with a current sheet in which the electrons drift with respect to the ions at twice the electron thermal velocity, v_d/v_e = 2. This is above threshold for a (kinetic) electrostatic Buneman instability which, in the absence of EM effects such as reconnection, would saturate by trapping and production of electron holes. The resultant heating of the electrons would then lead to a sub-Buneman distribution with v_d/v_e≍ 1, possibly on a timescale shorter than the characteristic EM timescale. However, in the simulation the reconnection EM processes increased the electron drift and current by the time electron holes were observed. Beginning with a sub-Buneman current sheet, and using both electrostatic and electromagnetic 2-D simulations, we seek to determine how electron holes can be created by (kinetic) Buneman instabilities as the drift velocity and current ramp up in time. In the electrostatic simulations the drift velocity is artificially ramped up by an electric field or other means, while in the electromagnetic simulations it is ramped up by the reconnection process itself. Various guiding magnetic field strengths are assumed, as are initial sub-Buneman electron distribution functions in space and velocity. Preliminary studies in 1-D show punctuated Buneman instabilities occurring as the drift is ramped up. At around vd/ve = 2, Buneman instability first occurs and electron holes are formed. Modifications in the electron distribution then saturate growth until the drift is further ramped up. 1Drake et al., Science, 299, 873--877 (2003).
Drake James F.
Goldman Martin V.
Newman D. L.
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