Probing shock wave properties essential for the generation of type II radio emissions in interplanetary space

Immanuel Christopher Jebaraj - Royal Observatory of Belgium; Athanasios Kouloumvakos - IRAP, Université de Toulouse, CNRS, CNES, UPS, France; Jasmina Magdalenic - Royal Observatory of Belgium, Belgium; Alexis Rouillard - IRAP, Université de Toulouse, CNRS, CNES, UPS, France; Stefaan Poedts - KU Leuven, Belgium

Session: Interplanetary CMEs and Solar Particle Events

Abstract

Eruptive events such as Coronal mass ejections (CMEs) and flares can generate shock waves. Tracking shock waves and predicting their arrival at Earth is a subject of numerous space weather studies. Ground-based radio observations allow us to locate shock waves in the low corona while space-based radio observations provide us opportunity to track shock waves in the inner heliosphere.

We present a case study of CME/flare event, associated shock wave and its radio signature, e.g. a type II radio burst.

In order to analyze the shock wave parameters, we employed 3D reconstruction and modelling of the shock wave using multi-viewpoint observations and evolved it in an MHD background produced by the MAS (Magnetohydrodynamics Around a Sphere) model.

To map regions of electron acceleration on the shock wave surface, we combined 3D shock modelling results with the 3D source positions of the type II burst obtained using the radio triangulation technique. We localize the region of interest on the shock surface and examine the shock wave parameters to understand the relationship between the shock wave and the radio event. First results show that shock geometry is important for the acceleration of electrons responsible for the generation of type II radio bursts.