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arXiv 2406.07372astro-ph.SRastro-ph.HE
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在太阳耀斑 X 射线数据中搜索快速脉动

Searching for rapid pulsations in solar flare X-ray data

Andrew R. Inglis, Laura A. Hayes

AI总结:

该研究系统分析 Fermi/GBM 约 1500 个 16 Hz 太阳耀斑观测,并结合合成光变曲线评估短周期准周期脉动,未发现其广泛存在的有力证据。

摘要:

大多数关于太阳耀斑准周期脉动的研究都识别出了 5–300 秒范围内的特征周期。由于观测限制,很少有研究尝试探测小于 5 秒的周期区间,并了解这种短周期准周期脉动的普遍程度。然而,Fermi 伽马射线暴监测器(GBM)迄今已以 16 Hz 的高时间分辨率爆发模式观测了约 1500 个太阳耀斑,为我们提供了在 X 射线能段研究短周期准周期脉动的机会。我们系统分析了 Fermi/GBM 在爆发模式下观测到的每一个太阳耀斑,估计准周期脉动在多个 X 射线能段中的普遍程度。为更好地理解这些结果,我们还辅以对合成太阳耀斑光变曲线的分析,这些曲线分别包含和不包含振荡信号。利用这些合成光变曲线,我们可以了解真实的 GBM 太阳数据中可能的误报率和真阳性率。我们没有发现短周期准周期脉动广泛存在的有力证据,这表明此类特征的基础发生率较低,或者它们在 Fermi/GBM 数据中的典型信噪比必定很低——小于 1。最后,我们展示了在 GBM 太阳 X 射线数据中识别出的一组最有趣的潜在准周期脉动事件。

英文摘要:

Most studies of quasi-periodic pulsations in solar flares have identified characteristic periods in the 5 - 300s range. Due to observational limitations there have been few attempts to probe the < 5s period regime and understand the prevalence of such short-period quasi-periodic pulsations. However, the Fermi Gamma-ray Burst Monitor (GBM) has observed approximately 1500 solar flares to date in high cadence 16 Hz burst mode, providing us with an opportunity to study short-period quasi-periodic pulsations at X-ray energies. We systematically analyse every solar flare observed by Fermi/GBM in burst mode, estimating the prevalence of quasi-periodic pulsations in multiple X-ray energy bands. To better understand these results, we complement this with analysis of synthetic solar flare lightcurves, both with and without oscillatory signals present. Using these synthetic lightcurves, we can understand the likely false alarm and true positive rates in the real solar GBM data. We do not find strong evidence for widespread short-period quasi-periodic pulsations, indicating either a low base occurrence rate of such signatures or that their typical signal-to-noise ratios must be low - less than 1 - in Fermi/GBM data. Finally, we present a selection of the most interesting potential quasi-periodic pulsation events that were identified in the GBM solar X-ray data.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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