Počet záznamů: 1
Fragmentation of electric currents in the solar corona by plasma flows
- 1.0399164 - ASÚ 2014 RIV FR eng J - Článek v odborném periodiku
Nickeler, Dieter Horst - Karlický, Marian - Wiegelmann, T. - Kraus, Michaela
Fragmentation of electric currents in the solar corona by plasma flows.
Astronomy & Astrophysics. Roč. 556, August (2013), A61/1-A61/12. ISSN 0004-6361. E-ISSN 1432-0746
Grant CEP: GA ČR GAP209/12/0103; GA ČR GA13-24782S
Institucionální podpora: RVO:67985815
Klíčová slova: magnetohydrodynamics * Sun flares * Sun corona
Kód oboru RIV: BN - Astronomie a nebeská mechanika, astrofyzika
Impakt faktor: 4.479, rok: 2013
We consider a magnetic configuration consisting of an arcade structure and a detached plasmoid, resulting from a magnetic reconnection process, as is typically found in connection with solar flares. We study spontaneous current fragmentation caused by shear and vortex plasma flows. We find that current fragmentation takes place at different locations within our configuration. Steep gradients of the Alfven Mach number are required, implying the strong influence of shear flows on current amplification and filamentation of the magnetohydrostatic current sheets. Crescent-or ring-like structures appear along the outer separatrix, butterfly structures between the upper and lower plasmoids, and strong current peaks close the lower boundary (photosphere). Furthermore, impressing an intrinsic small-scale structure on the upper plasmoid results in strong fragmentation of the plasmoid. Hence fragmentation of current sheets and plasmoids is an inherent property of magnetohydrodynamic theory.
Trvalý link: http://hdl.handle.net/11104/0226550
Počet záznamů: 1