Metric radio bursts and fine structures observed on 17 January, 2005

TL;DR

This paper analyzes a complex solar radio burst observed on January 17, 2005, revealing fine structures in the metric frequency range using high-resolution spectrograph data, linked to significant solar activity.

Contribution

It presents detailed analysis of fine structures in metric radio bursts, extending the Ondrejov Catalogue to lower frequencies with high temporal resolution data.

Findings

Detected fine structures in the 450-270 MHz range.

Found similarities between metric and higher frequency fine structures.

Linked radio burst features to major solar flares and CMEs.

Abstract

A complex radio event was observed on January 17, 2005 with the radio-spectrograph ARTEMIS-IV, operating at Thermopylae, Greece; it was associated with an X3.8 SXR flare and two fast Halo CMEs in close succession. We present dynamic spectra of this event; the high time resolution (1/100 s) of the data in the 450-270 MHz range, makes possible the detection and analysis of the fine structure which this major radio event exhibits. The fine structure was found to match, almost, the comprehensive Ondrejov Catalogue which it refers to the spectral range 0.8-2 GHz, yet seems to produce similar fine structure with the metric range.