Kilometric Type II Radio Bursts and Interplanetary shocks: A complete survey

MANINI, F.; CREMADES, H.; CÉCERE, M.; LÓPEZ, F.M.

San Juan

Congreso; 65a Reunión Anual de la Asociación Argentina de Astronomía; 2023

Type II radio bursts arise as a consequence of shocks typically driven by coronal mass ejections (CMEs). When these shocks propagate outward from the Sun, they drift down in frequency as excited particles emit at the local plasma frequency, creating the usual Type II patterns. In this work, we use dynamic spectra from the Wind/WAVES Thermal Noise Receiver (TNR, 4-256 kHz) to identify Type II radio emissions in the kilometric wavelength range (kmTIIs) (frequency < 300 kHz). Continuing with a previous work, we identified 320 kmTII events and compiled various characteristics for each of them. We found 136 kmTII events not reported by the official Wind/WAVES catalog (based on RAD1 and RAD2 data). We search for associations with interplanetary (IP) shocks and analyze their main characteristics, in order to reveal distinctive attributes that may correlate with the occurrence of kmTII emission. We find that 121 kmTII were linked to an IP shock. In this work we continued the search for more KmTII by lookingat the dynamic spectra from Wind’s TNR instrument, and built a complete list of events.