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We present a multi-wavelength investigation of a C-class flaring activitythat occurred in the active region NOAA 12734 on 8 March 2019. Theinvestigation utilises data from AIA and HMI on board the SDO and theUdaipur-CALLISTO solar radio spectrograph of the Physical Research Laboratory.This low intensity C1.3 event is characterised by typical features of a longduration event (LDE), viz. extended flare arcade, large-scale two-ribbonstructures and twin coronal dimmings. The eruptive event occurred in a coronalsigmoid and displayed two distinct stages of energy release, manifested interms of temporal and spatial evolution. The formation of twin dimming regionsare consistent with the eruption of a large flux rope with footpoints lying inthe western and eastern edges of the coronal sigmoid. The metric radioobservations obtained from Udaipur-CALLISTO reveals a broad-band($\approx$50-180 MHz), stationary plasma emission for $\approx$7 min during thesecond stage of the flaring activity that resemble a type IV radio burst. Atype III decametre-hectometre radio bursts with starting frequency of$\approx$2.5 MHz precedes the stationary type IV burst observed byUdaipur-CALLISTO by $\approx$5 min. The synthesis of multi-wavelengthobservations and Non-Linear Force Free Field (NLFFF) coronal modelling togetherwith magnetic decay index analysis suggests that the sigmoid flux ropeunderwent a zipping-like uprooting from its western to eastern footpoints inresponse to the overlying asymmetric magnetic field confinement. Theasymmetrical eruption of the flux rope also accounts for the observedlarge-scale structures viz. apparent eastward shift of flare ribbons and postflare loops along the polarity inversion line (PIL), and provides an evidencefor lateral progression of magnetic reconnection site as the eruption proceeds.

Two-stage evolution of an extended C-class eruptive flaring activity from sigmoid active region NOAA 12734: SDO and Udaipur-CALLISTO observations