Radio Observations of the January 20, 2005 X-Class Event

TL;DR

This study analyzes the complex radio signatures of the January 20, 2005 solar event, linking them with flares, CMEs, and particle acceleration, using multi-instrument data to interpret the event within established solar models.

Contribution

It provides a comprehensive multi-frequency analysis of a significant solar event, integrating observations with theoretical models to enhance understanding of radio signatures and energetic processes.

Findings

Radio signatures correlate with flare and CME activity.

Multi-instrument data supports combined model of reconnection and shock mechanisms.

Event evolution traced from the low corona to interplanetary space.

Abstract

We present a multi-frequency and multi-instrument study of the 20 January 2005 event. We focus mainly on the complex radio signatures and their association with the active phenomena taking place: flares, CMEs, particle acceleration and magnetic restructuring. As a variety of energetic particle accelerators and sources of radio bursts are present, in the flare-ejecta combination, we investigate their relative importance in the progress of this event. The dynamic spectra of {Artemis-IV-Wind/Waves-Hiras with 2000 MHz-20 kHz frequency coverage, were used to track the evolution of the event from the low corona to the interplanetary space; these were supplemented with SXR, HXR and gamma-ray recordings. The observations were compared with the expected radio signatures and energetic-particle populations envisaged by the {Standard Flare--CME model and the reconnection outflow termination shock model. A proper combination of these mechanisms seems to provide an adequate model for the interpretation of the observational data.