An analysis of interplanetary solar radio emissions associated with a coronal mass ejection

TL;DR

This study combines multiple observational techniques to analyze the origin and location of radio emissions during a coronal mass ejection, enhancing understanding of space weather phenomena.

Contribution

It introduces a novel application of radio direction-finding to interplanetary type II bursts and demonstrates the effectiveness of combining radio triangulation with white-light reconstructions.

Findings

Radio emissions originate from CME flanks

Radio source locations agree with white-light reconstructions

Radio triangulation complements 3D CME modeling

Abstract

Coronal mass ejections (CMEs) are large-scale eruptions of magnetized plasma that may cause severe geomagnetic storms if Earth-directed. Here we report a rare instance with comprehensive in situ and remote sensing observa- tions of a CME combining white-light, radio, and plasma measurements from four different vantage points. For the first time, we have successfully applied a radio direction-finding technique to an interplanetary type II burst detected by two identical widely separated radio receivers. The derived locations of the type II and type III bursts are in general agreement with the white light CME recon- struction. We find that the radio emission arises from the flanks of the CME, and are most likely associated with the CME-driven shock. Our work demon- strates the complementarity between radio triangulation and 3D reconstruction techniques for space weather applications.