About: Self-consistent stationary MHD shear flows in the solar atmosphere as electric field generators

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About: Self-consistent stationary MHD shear flows in the solar atmosphere as electric field generators Goto Sponge NotDistinct Permalink

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
Description	Within a physically simplified, but exact mathematical model, we study the electric currents and corresponding electric fields generated by shear flows. Methods: Starting from exact and analytically calculated magnetic potential fields, we solved the nonlinear MHD equations self-consistently. By applying a magnetic shear flow and assuming a nonideal MHD environment, we calculated an electric field via Faraday's law. The formal solution for the electromagnetic field allowed us to compute an expression of an effective resistivity similar to the collisionless Speiser resistivity. We find that the electric field can be highly spatially structured, or in other words, filamented. The electric field component parallel to the magnetic field is the dominant component and is high where the resistivity has a maximum. The electric field is a potential field, therefore, the highest energy gain of the particles can be directly derived from the corresponding voltage. In our example of a coronal post-flare scenario we obtain electron energies of tens of keV, which are on the same order of magnitude as found observationally. This energy serves as a source for heating and acceleration of particles. Within a physically simplified, but exact mathematical model, we study the electric currents and corresponding electric fields generated by shear flows. Methods: Starting from exact and analytically calculated magnetic potential fields, we solved the nonlinear MHD equations self-consistently. By applying a magnetic shear flow and assuming a nonideal MHD environment, we calculated an electric field via Faraday's law. The formal solution for the electromagnetic field allowed us to compute an expression of an effective resistivity similar to the collisionless Speiser resistivity. We find that the electric field can be highly spatially structured, or in other words, filamented. The electric field component parallel to the magnetic field is the dominant component and is high where the resistivity has a maximum. The electric field is a potential field, therefore, the highest energy gain of the particles can be directly derived from the corresponding voltage. In our example of a coronal post-flare scenario we obtain electron energies of tens of keV, which are on the same order of magnitude as found observationally. This energy serves as a source for heating and acceleration of particles. (en)
Title	Self-consistent stationary MHD shear flows in the solar atmosphere as electric field generators Self-consistent stationary MHD shear flows in the solar atmosphere as electric field generators (en)
skos:prefLabel	Self-consistent stationary MHD shear flows in the solar atmosphere as electric field generators Self-consistent stationary MHD shear flows in the solar atmosphere as electric field generators (en)
skos:notation	RIV/67985815:_____/14:00434761!RIV15-GA0-67985815
http://linked.open...avai/riv/aktivita	I P
http://linked.open...avai/riv/aktivity	I, P(GA13-24782S), P(GAP209/12/0103)
http://linked.open...iv/cisloPeriodika	September
http://linked.open...vai/riv/dodaniDat	2015
http://linked.open...aciTvurceVysledku	Karlický, Marian Kraus, Michaela Nickeler, Dieter Horst
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Astronomický ústav AV ČR, v. v. i.
http://linked.open...dnocenehoVysledku	44324
http://linked.open...ai/riv/idVysledku	RIV/67985815:_____/14:00434761
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	magnetohydrodynamics; Sum : flares; Sun : corona (en)
http://linked.open.../riv/klicoveSlovo	magnetohydrodynamics Sum : flares Sun : corona
http://linked.open...odStatuVydavatele	FR - Francouzská republika
http://linked.open...ontrolniKodProRIV	[1893A162FBD2]
http://linked.open...i/riv/nazevZdroje	Astronomy & Astrophysics
http://linked.open...in/vavai/riv/obor	BN
http://linked.open...ichTvurcuVysledku	3 (xsd:int)
http://linked.open...cetTvurcuVysledku	4 (xsd:int)
http://linked.open...vavai/riv/projekt	Radio and X-ray diagnostics of primary-energy-release processes in solar flares and their numerical simulations Turbulent energy transport in magnetic reconnection: Advanced numerical modeling and application to solar flares and eruptions
http://linked.open...UplatneniVysledku	2014
http://linked.open...v/svazekPeriodika	569
http://linked.open...iv/tvurceVysledku	Karlický, Marian Kraus, Michaela Nickeler, Dieter Horst Wiegelmann, T.
http://linked.open...ain/vavai/riv/wos	000343092100065
issn	0004-6361
number of pages	10 (xsd:int)
http://bibframe.org/vocab/doi	10.1051/0004-6361/201423819

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