Successive occurrences of quasi-circular ribbon flares in a fan-spine-like configuration involving hyperbolic flux tube

We present a comprehensive analysis of the formation and evolution fan-spine-like configuration that developed over complex photospheric where dispersed negative polarity regions were surrounded by positive regions. This unique configuration, analogous to geological "atoll" shape, hosted four homologous flares within its boundary. Computation degree squashing factor (Q) maps clearly revealed an elongated region high Q-values between inner outer spine-like lines, implying presence hyperbolic flux tube (HFT). The coronal associated with atoll was distinctly identified in form diffused dome-shaped bright structure directly observed EUV images. A filament channel resided near boundary region. activation eruption ropes from led onset eruptive quasi-circular ribbon interval $\approx$11 hours. During flares, we continuous decay cancellation Accordingly, apparent length HFT gradually reduced null-point-like before fourth flare. Prior each flare, localised brightening beneath filaments which, together cancellation, provided support for tether-cutting model solar eruption. magnetic index favourable conditions eruption, once pre-activated attained critical heights torus instability.