TY - JOUR
T1 - The effects of resistivity on oscillatory reconnection and consequences for solar flare quasi-periodic pulsations
AU - Schiavo, Luiz A.C.A.
AU - Stewart, James
AU - Browning, Philippa K.
PY - 2024/10
Y1 - 2024/10
N2 - Quasi-periodic pulsations are often observed in flare emissions. While these may reveal much about the time-dependent reconnection involved in flare energy release, the underlying mechanisms are still poorly understood. In this paper, we use 2D magnetohydrodynamic simulations to investigate the magnetic reconnection in two merging flux ropes, focusing on the effects of the resistivity on the time variation of the reconnection. We consider both uniform resistivity and current-dependent anomalous resistivity profiles. Our findings reveal that resistivity plays a critical role in controlling the reconnection dynamics, including reconnection rate oscillations and the rate of decay of the reconnection rate. Resistivity also influences the oscillations in emitted gyrosynchrotron radiation. However, in contrast to this strong influence of resistivity on reconnection rates, we observed a different behavior for the emitted waves, whose frequencies are almost independent of resistivity variations.
AB - Quasi-periodic pulsations are often observed in flare emissions. While these may reveal much about the time-dependent reconnection involved in flare energy release, the underlying mechanisms are still poorly understood. In this paper, we use 2D magnetohydrodynamic simulations to investigate the magnetic reconnection in two merging flux ropes, focusing on the effects of the resistivity on the time variation of the reconnection. We consider both uniform resistivity and current-dependent anomalous resistivity profiles. Our findings reveal that resistivity plays a critical role in controlling the reconnection dynamics, including reconnection rate oscillations and the rate of decay of the reconnection rate. Resistivity also influences the oscillations in emitted gyrosynchrotron radiation. However, in contrast to this strong influence of resistivity on reconnection rates, we observed a different behavior for the emitted waves, whose frequencies are almost independent of resistivity variations.
UR - http://www.scopus.com/inward/record.url?scp=85208286643&partnerID=8YFLogxK
U2 - 10.1063/5.0226068
DO - 10.1063/5.0226068
M3 - Article
SN - 1070-664X
VL - 31
JO - Physics of Plasmas
JF - Physics of Plasmas
IS - 10
M1 - 102903
ER -