In this study, we investigate the energy partition of four confined circular-ribbon flares (CRFs) that occurred close to solar disk center. The flares are observed simultaneously by the Solar Dynamics Observatory (SDO), the Geostationary Operational Environmental Satellites (GOES), and the Ramaty Hight Energy Solar Spectroscopic Imager (RHESSI). We calculate different energy components, including the radiative outputs in the ranges 1 – 8 Å, 1 – 70 Å, and 70 – 370 Å, total radiative loss, peak thermal energy derived from GOES and RHESSI, nonthermal energy in flare-accelerated electrons, and magnetic free energy before the flares. It is found that the values of energy components increase systematically with the flare class, indicating that more energy is involved in larger flares. The magnetic free energies (\(E_{mag}\)) are larger than the nonthermal energies (\(E_{nth}\)) and radiative outputs, which is consistent with the magnetic nature of flares. The ratio \(\frac{E_{nth}}{E_{mag}}\) of the four flares, being 0.70 – 0.76, is considerably higher than that of eruptive flares. Hence, this ratio may serve as an important factor for discriminating confined from eruptive flares. The nonthermal energies are sufficient to provide the heating requirements including the peak thermal energy and radiative loss. Our findings impose constraints on theoretical models of confined CRFs and have potential implications on space weather forecast.

在这项研究中，我们调查了发生在太阳电池中心附近的四个密闭环形带状耀斑（CRF）的能量分配。耀斑由太阳动力学天文台（SDO），对地静止作战环境卫星（GOES）和拉马蒂高能太阳光谱成像仪（RHESSI）同时观察。我们计算了不同的能量分量，包括1 – 8Å，1 – 70Å和70 – 370Å范围内的辐射输出，总辐射损耗，源自GOES和RHESSI的峰值热能，火炬加速电子中的非热能，以及耀斑之前的磁自由能。发现能量成分的值随耀斑类别而系统地增加，表明更大的耀斑涉及更多的能量。磁自由能（\（E_ {mag} \））大于非热能（\（E_ {nth} \））和辐射输出，这与耀斑的磁性有关。四个耀斑的比率\（\ frac {E_ {nth}} {E_ {mag}} \）为0.70-0.76，比喷发耀斑的比率高得多。因此，该比率可以作为区分爆发性耀斑的重要因素。非热能足以提供加热要求，包括峰值热能和辐射损耗。我们的发现对局限CRF的理论模型施加了约束，并对空间天气预报具有潜在的影响。