Long-period energy releases during a C2.8 flare

TL;DR

This study analyzes long-period pulsations during a C2.8 solar flare, revealing three energy release episodes driven by different mechanisms, including magnetic reconnection and loop interactions, observed across multiple wavelengths.

Contribution

It provides new insights into the multi-mechanism nature of energy releases during solar flares through detailed multi-wavelength analysis.

Findings

Three successive pulsations indicate three energy release episodes.

Different wavelengths reveal distinct mechanisms: electron acceleration and loop interactions.

Long-period pulsations suggest complex magnetic reconnection processes.

Abstract

We investigated the intermittent energy-releasing processes by analyzing the long-period pulsations during a C2.8 flare on 2023 June 03. The C2.8 flare shows three successive and repetitive pulsations in soft X-ray (SXR) and high-temperature extreme ultraviolet (EUV) emissions, which may imply three episodes of energy releases during the solar flare. The QPP period is estimated to be as long as about 7.5 minutes. EUV imaging observations suggest that these three pulsations come from the same flare area dominated by the hot loop system. Conversely, the flare radiation in wavelengths of radio/microwave, low-temperature EUV, ultraviolet (UV), and Ha only reveals the first pulsation, which may be associated with nonthermal electrons accelerated by magnetic reconnection. The other two pulsations in wavelengths of SXR and high-temperature EUV might be caused by the loop-loop interaction. Our observations indicate that the three episodes of energy releases during the C2.8 flare are triggered by different mechanisms, namely the accelerated electron via magnetic reconnection, and the loop-loop interaction in a complicated magnetic configuration.