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

Abstract

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. In conclusion, 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.

Authors:
ORCiD logo [1];  [1];  [1];  [1];  [1]; ORCiD logo [2]
  1. Univ. of California, Los Angeles, CA (United States)
  2. Univ. of Alberta, Edmonton, AB (Canada)
Publication Date:
Research Org.:
Univ. of California, Los Angeles, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1474291
Alternate Identifier(s):
OSTI ID: 1366575
Grant/Contract Number:  
FC02-07ER54918
Resource Type:
Accepted Manuscript
Journal Name:
Physics of Plasmas
Additional Journal Information:
Journal Volume: 24; Journal Issue: 7; Journal ID: ISSN 1070-664X
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Gekelman, W., DeHaas, T., Pribyl, P., Vincena, S., Van Compernolle, B., and Sydora, R. Non-local Ohm's law during collisions of magnetic flux ropes. United States: N. p., 2017. Web. https://doi.org/10.1063/1.4990054.
Gekelman, W., DeHaas, T., Pribyl, P., Vincena, S., Van Compernolle, B., & Sydora, R. Non-local Ohm's law during collisions of magnetic flux ropes. United States. https://doi.org/10.1063/1.4990054
Gekelman, W., DeHaas, T., Pribyl, P., Vincena, S., Van Compernolle, B., and Sydora, R. Thu . "Non-local Ohm's law during collisions of magnetic flux ropes". United States. https://doi.org/10.1063/1.4990054. https://www.osti.gov/servlets/purl/1474291.
@article{osti_1474291,
title = {Non-local Ohm's law during collisions of magnetic flux ropes},
author = {Gekelman, W. and DeHaas, T. and Pribyl, P. and Vincena, S. and Van Compernolle, B. and Sydora, R.},
abstractNote = {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. In conclusion, 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.},
doi = {10.1063/1.4990054},
journal = {Physics of Plasmas},
number = 7,
volume = 24,
place = {United States},
year = {2017},
month = {7}
}

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    Works referencing / citing this record:

    Quantifying reconnective activity in braided vector fields
    journal, July 2018