AI 中文总结
本研究利用Aditya-L1/HEL1OS的硬X射线观测，系统分析了34个X级太阳耀斑的准周期脉动，发现约74%的事件存在显著QPPs，周期集中在1.3-1.7分钟，调制深度随能量幂律增加，支持磁重联调制机制。
AI 中文摘要
我们呈现了2024年7月至2026年3月期间，由Aditya-L1上的HEL1OS仪器获得的X级太阳耀斑硬X射线（HXR）观测中检测到的准周期脉动（QPPs）的目录。该目录包含34个耀斑，跨越GOES级别X1.1至X7.1。QPPs通过基于集合经验模态分解（EEMD）和小波分析的统一程序进行检测和研究。在25个事件（约74%）中识别出统计显著的QPPs，表明QPPs是X级耀斑的常见属性。检测到的周期范围约为1至3分钟，且在1.3至1.7分钟之间显著集中，表明存在一个优先时间尺度，这可能与耀斑区域中的扭结或慢磁流体动力学振荡有关。在8-20 keV能量范围内，主导周期几乎与光子能量无关，而调制深度随光子能量系统性地增加，遵循指数约为1.5的幂律关系。在不同HXR能量通道中检测到的QPPs表现出强相位相干性和正互相关系数，表明它们受共同物理机制的调制。几个强耀斑显示出高达25%的HXR调制深度，为非线效应提供了证据。观测到的统计特性支持QPPs由重复磁重联产生的模型，无论是自发的还是由磁流体动力学振荡周期性调制的。这项研究确立了HEL1OS作为在太阳活动周期25期间定量研究耀斑QPPs的强大仪器。
英文摘要
We present the catalogue of quasi-periodic pulsations (QPPs) detected in hard X-ray (HXR) observations of X-class solar flares obtained with the HEL1OS instrument onboard Aditya-L1 during July 2024 - March 2026. The catalogue comprises 34 flares spanning GOES classes X1.1 - X7.1. QPPs are detected and studied using a uniform procedure based on Ensemble Empirical Mode Decomposition (EEMD) and wavelet analyses. Statistically significant QPPs are identified in 25 events (~74%), demonstrating that QPPs are a common property of X-class flares. The detected periods range from approximately 1 to 3 min, with a pronounced concentration between 1.3 and 1.7 min, suggesting the existence of a preferential timescale that may be associated with kink or slow magnetohydrodynamic oscillations in the flaring region. The dominant periods remain nearly independent of photon energy across the 8 - 20 keV range, while the modulation depth increases systematically with photon energy following a power-law relation with an exponent of about 1.5. QPPs detected in different HXR energy channels exhibit strong phase coherence and positive cross-correlation coefficients, indicating modulation by a common physical mechanism. Several intense flares display HXR modulation depths of up to 25%, providing evidence for nonlinear effects. The observed statistical properties support models in which QPPs are generated by repetitive magnetic reconnection, either spontaneous or periodically modulated by magnetohydrodynamic oscillations. This study establishes HEL1OS as a powerful instrument for quantitative studies of flare QPPs during Solar Cycle 25.
Comments17 pages, 5 figures, 2 tables, Accepted for Publication in The Astrophysical Journal (ApJ)
