[IGPP Everyone] Today -SPACE PHYSICS and HERMES SCIENCE CENTER SEMINAR - Fall Quarter - Friday November 13, 2020 - 3:30pm - UCLA Zoom
Marjorie Sowmendran
margie at igpp.ucla.edu
Fri Nov 13 09:50:02 PST 2020
R E M I N D E R
T O D A Y
SPACE PHYSICS and HERMES SCIENCE CENTER SEMINAR
ZOOM LINK PROVIDED BELOW
https://ucla.zoom.us/j/93382900867?pwd=TlVQRmZyVEJFa0FCZWlRMU0yREtjUT09
Date/Time: November 13, 2020/ 03:30 PM Pacific Time (US and Canada)
SPACE PHYSICS and HERMES SCIENCE CENTER SEMINAR
DEPARTMENT OF EARTH, PLANETARY, AND SPACE SCIENCES
DEPARTMENT OF ATMOSPHERIC AND OCEANIC SCIENCES
UNIVERSITY OF CALIFORNIA, LOS ANGELES
Exploring driven collisionless reconnection in the Terrestrial Reconnection Experiment (TREX)
J. Egedal, U. of Wisconsin
The Terrestrial Reconnection Experiment (TREX) [1] executed in the Big Red Ball at the University of Wisconsin is optimized to study magnetic reconnection in a regime where Coulomb collisions between electrons and ions are sufficiently infrequent that kinetic effects in the electron dynamics are retained. In this talk I will review the experimental configuration and review early significant results but then turn to important recent discoveries. Upgrades to the reconnection drive now allows us to access are more fully collisionless regime in which electron pressure anisotropy develops and is fundamental to the structure of the electron diffusion region. The observed signatures of reconnection include narrow electron jets and current layers with widths down to the scale length of the electron skin depth, confirming previous results from fully kinetic simulations. Driven reconnection scenarios are important to a range of systems including the interaction of stellar winds with planetary magnetospheres. We also observe a shock interface to form between the supersonically driven plasma inflow; a region of magnetic flux pileup permits the normalized reconnection rate to self-regulate to a value where the inflow speed is about 50% of the Alfvenic outflow speeds observed in the reconnection exhaust, weakly dependent on the system size.
[1] J. Olson, et al., Phys. Rev. Lett 116, 255001 (2016 )
[2] C.B. Forest, et al., Jour. Plasma Phys., 81, 345810501 (2015 )
Friday, November 13, 2020
3:30 - 5:00 PM
In-Charge: Marco Velli
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