dc.contributor.author | Craig, Ian J.D. | |
dc.date.accessioned | 2009-08-07T05:02:15Z | |
dc.date.available | 2009-08-07T05:02:15Z | |
dc.date.issued | 2008 | |
dc.identifier.citation | Craig, I.J.D. (2008). Influence of the Hall effect on the reconnection rate at line-tied magnetic X-points. Astronomy & Astrophysics, 487(3), 1155-1161. | en |
dc.identifier.uri | https://hdl.handle.net/10289/2755 | |
dc.description.abstract | Context: Visco-resistive damping in line-tied magnetic X-points is examined.
Aims: The goal is to determine whether fast, Alfvénic energy dissipation is possible for X-point disturbances damped by the plasma resistivity and non-isotropic viscosity.
Methods: The response of X-points to planar and axial perturbations is explored numerically by solving the linearized compressible MHD equations in two and a half dimensions.
Results: It is demonstrated that fast dissipation is possible in the case of non-reconnective planar disturbances damped by anisotropic viscosity in weakly resistive plasmas. Although perturbations which change the initial X-point topology decay slowly at large times when viscous effects are dominant, there is an initial phase in which a significant fraction of the disturbance energy is removed on an Alfvénic timescale. The decay of incompressive axial field disturbances occurs by a different mechanism, however, that is always formally slow (i.e. dependent on the small viscous and resistive damping coefficients).
Conclusions: Computations suggest that fast, visco-resistive energy release in coronal plasmas is possible for compressive X-point disturbances. This result could have important implications for understanding rapid energy release in coronal active regions. | en |
dc.format.mimetype | application/pdf | |
dc.language.iso | en | |
dc.publisher | E D P Sciences | en_NZ |
dc.rights | This article is published in the journal: Astronomy and Astrophysics. © ESO 2008. | en |
dc.subject | magnetohydrodynamics | en |
dc.subject | flares | en |
dc.subject | magnetic fields | en |
dc.subject | corona | en |
dc.subject | plasmas | en |
dc.title | Anisotropic viscous dissipation in compressible magnetic X-points | en |
dc.type | Journal Article | en |
dc.identifier.doi | 10.1051/0004-6361:200809960 | en |
dc.relation.isPartOf | Astronomy & Astrophysics | en_NZ |
pubs.begin-page | 1155 | en_NZ |
pubs.elements-id | 33370 | |
pubs.end-page | 1161 | en_NZ |
pubs.issue | 3 | en_NZ |
pubs.volume | 487 | en_NZ |