A Study of the 2012 January 19 Complex Type II Radio Burst Using Wind, SOHO, and STEREO Observations

TL;DR

This paper analyzes a complex type II radio burst from January 19, 2012, using multi-spacecraft observations to understand its structure, origin, and association with a coronal mass ejection.

Contribution

It provides a detailed case study of a complex type II radio burst, linking radio features with CME dynamics and shock speeds using multi-instrument data.

Findings

Identified two type II burst components at different wavelengths.

Linked the short-lived DH component to the shock nose.

Demonstrated consistency between radio-derived shock speeds and white-light observations.

Abstract

We report on a case study of the complex type II radio burst of 2012 January 19 and its association with a white light coronal mass ejection (CME). The complexity can be described as the appearance of an additional type II burst component and strong intensity variation. The dynamic spectrum shows a pair of type II bursts with fundamental harmonic structures, one confined to decameter-hectometric (DH) wavelengths and the other extending to kilometric (km) wavelengths. By comparing the speeds obtained from white-light images with that speed of the shock inferred from the drift rate, we show that the source of the short-lived DH component is near the nose.