Origin of later band-like lanes following the Type II burst

Determine the physical origin of the two later lanes or bands observed around 14:15 UT in the I-LOFAR dynamic spectrum on 10 May 2022 that mirror the end of the Type II radio burst and exhibit band-splitting, specifying the emission mechanism and source region responsible for these features.

Background

During the 10 May 2022 event, I-LOFAR recorded a Type II radio burst with clear fundamental and harmonic bands exhibiting band-splitting, along with fine structures such as herringbones. Near the end of the Type II burst (approximately 14:15 UT), two additional lanes appeared in the dynamic spectrum that mirrored the end of the Type II burst in time-frequency morphology and also appeared to show band-splitting.

The authors explicitly note that the source of these later bands is unknown. Clarifying whether these delayed bands are a continuation of shock-related emission, a separate emission process, or an artifact related to propagation or instrumental effects is necessary to understand the shock dynamics and electron acceleration processes during the event.