Reversed Drifting Quasi-periodic Pulsating Structure in an X1.3 Solar Flare on 2005 July 30

TL;DR

This paper reports the observation of a reversed drifting quasi-periodic pulsating structure in a solar flare, revealing complex pulsation components and linking them to flare dynamics through multi-wavelength analysis.

Contribution

It is the first detailed analysis of a reversed drifting pulsating structure in a solar flare, combining microwave and X-ray data to explore flare source dynamics.

Findings

Identification of two distinct VSP components with different periods

Detection of weak left-handed circular polarization in R-DPS

Linking R-DPS features to flare emission source processes

Abstract

Based on the analysis of the microwave observations at frequency of 2.60 -- 3.80 GHz in a solar X1.3 flare event observed at Solar Broadband RadioSpectrometer in Huairou (SBRS/Huairou) on 2005 July 30, an interesting reversed drifting quasi-periodic pulsating structure (R-DPS) is confirmed. The R-DPS is mainly composed of two drifting pulsating components: one is a relatively slow very short-period pulsation (VSP) with period of about 130 -- 170 ms, the other is a relatively fast VSP with period of about 70 -- 80 ms. The R-DPS has a weak left-handed circular polarization. Based on the synthetic investigations of Reuven Ramaty High Energy Solar Spectroscopic Imaging (RHESSI) hard X-ray, Geostationary Operational Environmental Satellite (GOES) soft X-ray observation, and magnetic field extrapolation, we suggest the R-DPS possibly reflects flaring dynamic processes of the emission source regions.