A Peculiar Microwave Quasi-periodic Pulsation with Zigzag Pattern in a CME-related Flare on 2005-01-15

TL;DR

This paper reports the first observation of a peculiar zigzag pattern in microwave quasi-periodic pulsations during a solar flare, revealing insights into the flare's early phase and source region dynamics.

Contribution

It presents the first detection and analysis of a zigzag microwave QPP in a solar flare, highlighting its unique spectral features and potential to inform on source region kinematics.

Findings

Z-QPP occurred in the early rising phase of the flare.

Source width varied from about 1000 km to 3300 km.

Spectral fine structures reflect non-thermal particle dynamics.

Abstract

A peculiar microwave quasi-periodic pulsation with zigzag pattern (Z-QPP) is observed first by the Chinese Solar Broadband Spectrometer in Huairou (SBRS/Huairou) at 1.10-1.34 GHz in a solar flare on 2005-01-15. The Z-QPP occurred just in the early rising phase of the flare with weakly right-handed circular polarization. Its period is only several decades millisecond. Particularly, before and after the pulsation, there are many spectral fine structures, such as zebra patterns, fibers, and millisecond spikes. The microwave Z-QPP can provide some kinematic information of the source region in the early rising phase of the flare, and the source width changes from about 1000 km to 3300 km, even if we have no imaging observations. The abundant spectral fine structures possibly reflect the dynamic features of non-thermal particles.