Physics
Scientific paper
Dec 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008agufmsm31a1689f&link_type=abstract
American Geophysical Union, Fall Meeting 2008, abstract #SM31A-1689
Physics
7829 Kinetic Waves And Instabilities, 7831 Laboratory Studies And Experimental Techniques, 7835 Magnetic Reconnection (2723, 7526), 7852 Solitons And Solitary Waves (4455)
Scientific paper
We report experimental observations of electrostatic turbulence during spontaneous magnetic reconnection events on the VTF experiment [1]. Reconnection is studied in a regime with strong guide field (Bguide/Brec ~ 10) and high density (ωpe/ωce ~ 10). Electrostatic fluctuations are observed by small, high-bandwidth, impedance-matched Langmuir (RF) probes using high- speed (up to 16~GHz) digital oscilloscopes. Fluctuations correlate in time with reconnection events and include broadband fluctuations extending from ωLH to ωce, wave packets near ωce, and large-amplitude, positive potential spikes, identified as electron phase space holes [2]. With arrays of RF probes we have measured the phase velocity of the fluctuations, and in the case of the holes, the speed and shape of the propagating structures. For the holes, the parallel and perpendicular sizes are roughly equal, approximately 1-2 mm (50-100 λD, or 5-10 ρe). Finally, we will present studies of the relationship between the fluctuations, reconnection electric fields, and creation of energetic particles during the reconnection process. The latter are studied with a novel electron energy analyzer which integrates 7 grid/collector pairs into a small, 1.5~cm area. We are in the process of correlating cause and effect between the reconnection process and the formation of turbulence, holes, and electric fields (reconnection rate). This work was funded in part by DOE Grant DE-FG02-06ER54878 and CMPD Grant DEFC02-04ER54786. [1] J. Egedal, et al., PRL 98 015003 (2007). [2] M.V. Goldman, D. Newman, and A. Mangeney, PRL 99, 145002 (2007).
Egedal Jan
Fox Richard W.
Katz Nets
Le Anh
Porkolab Miklos
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