Non-local Ohm's law during collisions of magnetic flux ropes | Zendy

Walter Gekelman | Zendy; T. DeHaas | Zendy; Patrick Pribyl | Zendy; S. Vincena | Zendy; B. Van Compernolle | Zendy; R. D. Sydora | Zendy

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Non-local Ohm's law during collisions of magnetic flux ropes

Author(s) -

Walter Gekelman,

T. DeHaas,

Patrick Pribyl,

S. Vincena,

B. Van Compernolle,

R. D. Sydora

Publication year - 2017

Publication title -

physics of plasmas

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.75

H-Index - 160

eISSN - 1089-7674

pISSN - 1070-664X

DOI - 10.1063/1.4990054

Subject(s) - physics , ohm , ohm's law , electrical resistivity and conductivity , magnetic field , rope , magnetic flux , plasma , flux (metallurgy) , magnetohydrodynamics , condensed matter physics , magnetic reconnection , dissipation , quantum electrodynamics , computational physics , mechanics , nuclear physics , quantum mechanics , materials science , metallurgy , structural engineering , engineering

Two kink unstable magnetic flux ropes are produced in a carefully diagnosed laboratory experiment. Using probes, the time varying magnetic field, plasma potential, plasma flow, temperature, and density were measured at over 42 000 spatial locations. These were used to derive all the terms in Ohm's law to calculate the plasma resistivity. The resistivity calculated by this method was negative in some spatial regions and times. Ohm's law was shown to be non-local. Instead, the Kubo resistivity at the flux rope kink frequency was calculated using the fluctuation dissipation theorem. The resistivity parallel to the magnetic field was as large as 40 times the classical value and peaked where magnetic field line reconnection occurred as well as in the regions of large flux rope current.

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