Current limitation and solar flares

Carlqvist, Per

doi:10.1007/bf00146143

Cited by 102 publications

(27 citation statements)

References 12 publications

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“…In the simulations, the fluctuations are found to be growing electron holes, which appear to be caused by the rarefaction instability (Carlqvist, 1972;Block, 1972;Singh, 1982).…”

Section: Applied Potential Dropmentioning

confidence: 91%

Electric fields and double layers in plasmas

1987

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Various mechanisms for driving double layers in plasmas are briefly described, including applied potential drops, currents, contact potentials, and plasma expansions. Some dynamical features of the double layers are discussed. These features, as seen in simulations, laboratory experiments, and theory, indicate that double layers and the currents through them undergo slow oscillations which are determined by the ion transit time across an effective length of the system in which the double layers form. It is shown that a localized potential dip forms at the low potential end of a double layer, which interrupts the electron current through it according to the Langmuir criterion, whenever the ion flux into the double is disrupted. The generation of electric fields perpendicular to the ambient magnetic field by contact potentials is also discussed. Two different situations have been considered; in one, a low-density hot plasma is sandwiched between high-density cold plasmas, while in the other a high-density current sheet permeates a low-density background plasma. Perpendicular electric fields develop near the contact surfaces. In the case of the current sheet, the creation of parallel electric fields and the formation of double layers are also discussed when the current sheet thickness is varied. Finally, the generation of electric fields (parallel to an ambient magnetic field) and double layers in an expanding plasmas is discussed.

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“…In the simulations, the fluctuations are found to be growing electron holes, which appear to be caused by the rarefaction instability (Carlqvist, 1972;Block, 1972;Singh, 1982).…”

Section: Applied Potential Dropmentioning

confidence: 91%

Electric fields and double layers in plasmas

1987

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“…For a force-free filament of the type shown in Figure 1 and having the length, l, the internal inductance is /x01 Li ~--(2.3) 47r (Carlqvist, 1969;Bostr6m, 1973). If we assume that the filament forms a semicircular loop with a diameter, d = l0 s m, i.e.…”

Section: Storage Of the Flare Energymentioning

confidence: 99%

“…The potential drop, Uo, across the double layer depends both on the current density and on the thickness of the double layer, lo (Langmuir, 1929;Carlqvist, 1969). As long as the thickness of the layer is smaller than the radius of cross-section of the current filament, ro, the potential drop increases steadily with lo.…”

Section: Storage Of the Flare Energymentioning

confidence: 99%

“…The aim of the present paper is to discuss an ejection mechanism for surges within the framework of an earlier proposed model for solar flares founded on current disruption (Alfv6n and Carlqvist, 1967;Carlqvist, 1969Carlqvist, , 1973. By means of such an approach the observed connection between surges and flares may find a simple explanation.…”

Section: Introductionmentioning

confidence: 99%

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A flare-associated mechanism for solar surges

Carlqvist

1979

Sol Phys

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An ejection mechanism for solar surges is discussed. The mechanism is closely related to an earlier proposed model for solar flares founded on current disruption. Hence, the observed connection between surges and flares may be explained in a simple way. The mechanism can also offer explanations of other questions connected with surges such as why surges tend to grow up from small bright knots emitting moustache spectra, why strong magnetic field concentrations are observed near the base of surges, why surges often exhibit a helical motion, and why homologous surges are produced. Finally it is pointed out that spicules might be generated by a mechanism similar to that discussed for surges.

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“…Double layers have also been invoked to explain solar flares [2], and the modulation of the Jovian decametric radiation by 10 [22]. Two the ion flux through the double layer must be much smaller than the electron flux, thus establishing the condition that a net current must exist through the double layer.…”

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confidence: 99%

General Bohm and Langmuir Conditions for a Strong Double Layer in Space Plasmas

Williams¹

1986

IEEE Trans. Plasma Sci.

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Abstract-We investigate the general Bohm and Langmuir conditions for a strong double layer and show that in some cases these do not necessarily imply a net current through the dbuble layer as is now the popular belief. We demonstrate this by deriving the appropriate Bohm and Langmuir conditions when there are three beam-type particles passing through the double layer in addition to the usual two species of trapped particles.

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Current limitation and solar flares

Cited by 102 publications

References 12 publications

Electric fields and double layers in plasmas

Electric fields and double layers in plasmas

A flare-associated mechanism for solar surges

General Bohm and Langmuir Conditions for a Strong Double Layer in Space Plasmas

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