TY  - JOUR
A1  - Louis, Rohan E.
A1  - Kliem, Bernhard
A1  - Ravindra, B.
A1  - Chintzoglou, Georgios
T1  - Triggering an Eruptive Flare by Emerging Flux in a Solar Active-Region Complex
JF  - Solar physics : a journal for solar and solar-stellar research and the study of solar terrestrial physics
N2  - A flare and fast coronal mass ejection originated between solar active regions NOAA 11514 and 11515 on 2012 July 1 (SOL2012-07-01) in response to flux emergence in front of the leading sunspot of the trailing region 11515. Analyzing the evolution of the photospheric magnetic flux and the coronal structure, we find that the flux emergence triggered the eruption by interaction with overlying flux in a non-standard way. The new flux neither had the opposite orientation nor a location near the polarity inversion line, which are favorable for strong reconnection with the arcade flux under which it emerged. Moreover, its flux content remained significantly smaller than that of the arcade (). However, a loop system rooted in the trailing active region ran in part under the arcade between the active regions, passing over the site of flux emergence. The reconnection with the emerging flux, leading to a series of jet emissions into the loop system, caused a strong but confined rise of the loop system. This lifted the arcade between the two active regions, weakening its downward tension force and thus destabilizing the considerably sheared flux under the arcade. The complex event was also associated with supporting precursor activity in an enhanced network near the active regions, acting on the large-scale overlying flux, and with two simultaneous confined flares within the active regions.
KW  - Flares, dynamics
KW  - Sunspots, magnetic fields
KW  - Chromosphere, active
KW  - Corona
KW  - Prominences, active
Y1  - 2015
U6  - https://doi.org/10.1007/s11207-015-0726-8
SN  - 0038-0938
SN  - 1573-093X
VL  - 290
IS  - 12
SP  - 3641
EP  - 3662
PB  - Springer
CY  - Dordrecht
ER  -