Metric Radio Bursts and Fine Structures Observed on January 20, 2005

TL;DR

This paper analyzes a complex solar radio event from January 20, 2005, observed with high resolution, revealing fine structures that match established classifications and providing insights into solar radio burst phenomena.

Contribution

It presents detailed observations of solar radio bursts with fine structures at decimetric frequencies, comparing them with existing classifications and expanding understanding of solar radio emissions.

Findings

Rich fine structures observed in the 270-420 MHz range.

Fine structures approximately match Ondrejov Classification.

Comparison with decimetric and microwave data enhances understanding.

Abstract

A major radio event, associated with an X7.1/2B flare in AR720 and a fast CME was observed on January 20, 2005 with the radio-spectrograph ARTEMIS-IV; it was particularly intense and with a complex radio signature with rich fine structure which was recorded in the 270-420 MHz range at high resolution (100 samples/sec). The fine structure is compared with similar results in the decimetric and microwave frequency range. It was found to approximately match the comprehensive Ondrejov Classification in the spectral range 0.8-2 GHz.