Current interruption and impulsive flux transfer solar flare models

Baum, P. J.; Bratenahl, A.; Kamin, G.

doi:10.1086/156609

Cited by 29 publications

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“…Some experiments have used Ohm's law with assumptions in order to neglect terms to estimate the resistivity. [34][35][36] It is not clear if their conclusions are valid. The closest experiment to this one was reported by Intrator et al 21 The flux ropes were produced by two plasma guns at the end of a vacuum vessel with an axial field and there was no background plasma.…”

mentioning

confidence: 99%

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

et al. 2017

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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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confidence: 99%

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

et al. 2017

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“…Experiments have tried to correct for the boundary effects (Roehling 1963) but one cannot be sure the corrections are valid without corroborating sheath measurements. Other earlier experiments have used Ohm's law with various assumptions and neglected terms to estimate the resistivity (Baum et al 1978;Zarnstorff et al 1988 . 2006).…”

Section: Discussionmentioning

confidence: 99%

Nonlocal Ohms Law, Plasma Resistivity, and Reconnection During Collisions of Magnetic Flux Ropes

Gekelman

DeHaas

Pribyl

et al. 2018

ApJ

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The plasma resistivity was evaluated in an experiment on the collision of two magnetic flux ropes. Whenever the ropes collide, some magnetic energy is lost as a result of reconnection. Volumetric data, in which all the relevant time-varying quantities were recorded in detail, are presented. Ohm's law is shown to be nonlocal and cannot be used to evaluate the plasma resistivity. The resistivity was instead calculated using the AC Kubo resistivity and shown to be anomalously high in certain regions of space.

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“…3.1. Note further, this process provides a very plausible setting for the current interruption solar flare model (Baum et al, 1978;Baum and Bratenahl, 1982) of Alfven and Carlquist (1962) and Carlquist (1982).…”

Section: Impulsive Flux Transfer Eventsmentioning

confidence: 94%

“…The fibers, however, define the footpoints of field lines making up topologically distinct tubular flux cells. As these are shuffled about by the powerful convective motion below, EMF f s are generated (Baum, et al, 1978(Baum, et al, , 1979Bratenahl andd Baura, 1982) which drive the lively solar activity above, as Ionson (1985) mentioned yesterday. On this basis, we expect reconnection in pinch current sheets to be by far the dominant dynamic dissipation mode in the solar atmosphere.…”

Section: Scaling Wall Effects and Global Boundary Conditionsmentioning

confidence: 99%

Laboratory Experiments on Reconnection in Current Sheets

Bratenahl

Baum

1985

Symp. - Int. Astron. Union

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Laboratory reconnection experiments dedicated to problems of space and astrophysics are briefly reviewed with the purpose of demonstrating that such experiments can provide important insights of considerable value to the development of reconnection theory. Moreover, many of these insights are of a kind not likely to be perceived either when working directly with space observations or while pursuing a course of pure theoretical reasoning without reference to laboratory results.

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Current interruption and impulsive flux transfer solar flare models

Cited by 29 publications

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

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

Nonlocal Ohms Law, Plasma Resistivity, and Reconnection During Collisions of Magnetic Flux Ropes

Laboratory Experiments on Reconnection in Current Sheets

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