  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.
