eprintid: 1394572
rev_number: 42
eprint_status: archive
userid: 608
dir: disk0/01/39/45/72
datestamp: 2013-05-29 20:16:08
lastmod: 2021-10-21 23:20:11
status_changed: 2013-05-29 20:16:08
type: article
metadata_visibility: show
item_issues_count: 0
creators_name: Török, T
creators_name: Temmer, M
creators_name: Valori, G
creators_name: Veronig, AM
creators_name: van Driel-Gesztelyi, L
creators_name: Vršnak, B
title: Initiation of coronal mass ejections by sunspot rotation
ispublished: pub
divisions: UCL
divisions: B04
divisions: C06
divisions: F63
note: The final publication is available at link.springer.com
abstract: We study a filament eruption, two-ribbon flare, and coronal mass ejection (CME) that occurred in NOAA Active Region 10898 on 6 July 2006. The filament was located South of a strong sunspot that dominated the region. In the evolution leading up to the eruption, and for some time after it, a counter-clockwise rotation of the sunspot of about 30 degrees was observed. We suggest that the rotation triggered the eruption by progressively expanding the magnetic field above the filament. To test this scenario, we study the effect of twisting the initially potential field overlying a pre-existing flux-rope, using three-dimensional zero-β MHD simulations. We first consider a relatively simple and symmetric system, and then study a more complex and asymmetric magnetic configuration, whose photospheric-flux distribution and coronal structure are guided by the observations and a potential field extrapolation. In both cases, we find that the twisting leads to the expansion of the overlying field. As a consequence of the progressively reduced magnetic tension, the flux-rope quasi-statically adapts to the changed environmental field, rising slowly. Once the tension is sufficiently reduced, a distinct second phase of evolution occurs where the flux-rope enters an unstable regime characterised by a strong acceleration. Our simulations thus suggest a new mechanism for the triggering of eruptions in the vicinity of rotating sunspots.
date: 2013-09
official_url: http://dx.doi.org/10.1007/s11207-013-0269-9
vfaculties: VMPS
oa_status: green
full_text_type: other
language: eng
primo: open
primo_central: open_green
verified: verified_manual
elements_source: Scopus
elements_id: 872236
doi: 10.1007/s11207-013-0269-9
lyricists_name: Valori, Gherardo
lyricists_name: Van Driel-Gesztelyi, Lidia
lyricists_id: GVALO42
lyricists_id: LVAND77
full_text_status: public
publication: Solar Physics
volume: 286
number: 2
pagerange: 453 -477
issn: 0038-0938
citation:        Török, T;    Temmer, M;    Valori, G;    Veronig, AM;    van Driel-Gesztelyi, L;    Vršnak, B;      (2013)    Initiation of coronal mass ejections by sunspot rotation.                   Solar Physics , 286  (2)   453 -477.    10.1007/s11207-013-0269-9 <https://doi.org/10.1007/s11207-013-0269-9>.       Green open access   
 
document_url: https://discovery.ucl.ac.uk/id/eprint/1394572/1/Torok_etal_2013_SolarPhysics_286_453.pdf