| Name: | Mayank Rajput |
| Affiliation: | National Institute Of Technology Rourkela |
| Conference ID : | ASI2024_550 |
| Title : | Narrow-band Type II emissions associated with CMEs of large angular widths: A new characteristics for metric Type II bursts |
| Authors : | Mayank Rajput, Susanta Kumar Bisoi |
| Authors Affiliation: | Mayank Rajput, Susanta Kumar Bisoi Affiliation(National Institute Of Technology, Rourkela-769008, India |
| Mode of Presentation: | Poster |
| Abstract Category : | Sun, Solar System, Exoplanets, and Astrobiology |
| Abstract : | Solar Type II radio bursts are manifestations of shocks produced by explosive and eruptive solar activities, such as solar flares and coronal mass ejections (CME). However, metric range or coronal Type II bursts are interesting to study because of their association with CME-driven shocks. It is, therefore, crucial to study the correlation between different properties of Type II bursts and the associated CMEs. This, in turn, would be useful to understand the impact CMEs have on space weather and geomagnetic activity. In this study, we conducted a statistical analysis of coronal Type II radio bursts obtained using an e-Callisto spectrograph. We correlated their frequency bandwidth to the angular width of the associated CMEs for twelve Type II radio bursts spanning 2007--2021. Our investigation shows an anti-correlation between the two quantities with a correlation coefficient of approx 60%, suggesting that the CMEs with large angular widths could produce narrow-band Type II emissions, in stark contrast to the recent report that they produce broad-band Type II emissions. We further deduced the height of the Type II bursts (rType II) at the onset time of the burst and compared them with the estimated height of the associated CMEs/shocks (rCME). For most of the Type II burst events, rType II was < rCME, suggesting that the Type II emissions could be produced in the flank region of the shock rather than in the shock front. Based on our results, we explain the observed narrow-band Type II emissions associated with the CME-driven shocks, even though the angular widths of the concerned CMEs were larger. |
