Abstract Details


Name: NADIYA K
Affiliation: Mahatma Gandhi University, Kottayam , Kerala ,India
Conference ID: TVS202510236
Title: Multilane Type II Radio Bursts: Insights into Shock Propagation in the Corona
Authors and Co-Authors: Nadiya K, Anshu Kumari
Abstract Type: Contributory Presentation
Abstract: Solar radio bursts provide valuable insights into the physical mechanisms driving small- and large-scale solar eruptions. Metric radio observations, in particular, offer direct access to the inner and middle corona, making them an essential tool for monitoring coronal dynamics. Type II metric radio bursts, interpreted as signatures of shock waves in the solar corona, are considered important proxies for observations in the height range of ~1.3–2.5 R⊙, where R⊙ is the solar photospheric radius. We studied a multilane type II radio burst,with clear signatures of fundamental and harmonic lanes, with both lanes exhibiting spilt- bands. Imaging data from the Nançay Radioheliograph (NRH) revealed multiple spatially separated radio sources, indicating several particle acceleration sites along different regions of the shock front. The radio sources were predominantly located at the CME/EUV disturbance flanks, suggesting that shock geometry plays a key role in the observed spectral features. Interestingly, frequency–height discrepancies were observed: at times, 228 MHz sources appeared at greater heights than 150 MHz sources, while at other times the reverse held true, consistent with theoretical expectations. This indicates that shock geometry and plasma inhomogeneity strongly affect lane positions, suggesting that traditional FH–SB pairs may in fact consist of multiple shock-related bands.