Constraining the onset height of coronal mass ejection driven shocks using near-Sun observations in visible and radio wavelengths

Abstract

One of the debated issues about the onset of the type II radio bursts near the Sun is the heliocentric distance (r) at which the associated magnetohydrodynamic (MHD) shocks are formed, and the association of the latter with the coronal mass ejections (CMEs). The debate is primarily due to the absence of routine CME observations in whitelight at r<1.5R⊙. We present here an example for how joint observations with the Visible Emission Line Coronagraph (VELC) onboard the recently launched ADITYA-L1 (the first dedicated Indian space solar mission, (Parate et al. 2025 SP 300, 128), and Gauribidanur radio facilities could be useful to address the issue.