太阳耀斑中的宽带准周期射电和X射线脉动
Broadband Quasi-Periodic Radio and X-ray Pulsations in a Solar Flare
摘要：
我们描述了2003年6月15日GOES X1.3太阳耀斑强准周期脉动的微波和硬X射线观测。无线电观测是由欧文斯谷太阳能阵列（OVSA），野边山偏振计（NoRP）和野边山射电日像仪（NoRH）联合进行的。硬X射线观测由拉马迪高能太阳光谱成像仪（RHESSI）进行。利用傅里叶分析，我们研究了射电和X射线脉动的频率和能量依赖的振荡周期、微分相位和调制幅度。集中在更完整的无线电观测，我们还检查调制的圆偏振度和无线电频谱指数。所观察到的振荡特性进行了比较，来自两个简单的模型的无线电发射。特别是，我们明确地将观测到的调制幅度数据拟合到两个竞争模型。第一个模型考虑了MHD振荡对射电辐射的影响。第二个模型考虑了快电子的准周期注入。我们证明了快电子的准周期加速和注入是射电和硬X射线发射中观察到的准周期振荡的更可能的原因，这对耀斑源中的粒子加速和输运具有重要意义。
英文摘要：
We describe microwave and hard X-ray observations of strong quasiperiodic pulsations from the GOES X1.3 solar flare on 15 June 2003. The radio observations were made jointly by the Owens Valley Solar Array (OVSA), the Nobeyama Polarimeter (NoRP), and the Nobeyama Radioheliograph (NoRH). Hard X-ray observations were made by the Ramaty High Energy Solar Spectroscopic Imager (RHESSI). Using Fourier analysis, we study the frequency- and energy-dependent oscillation periods, differential phase, and modulation amplitudes of the radio and X-ray pulsations. Focusing on the more complete radio observations, we also examine the modulation of the degree of circular polarization and of the radio spectral index. The observed properties of the oscillations are compared with those derived from two simple models for the radio emission. In particular, we explicitly fit the observed modulation amplitude data to the two competing models. The first model considers the effects of MHD oscillations on the radio emission. The second model considers the quasi-periodic injection of fast electrons. We demonstrate that quasiperiodic acceleration and injection of fast electrons is the more likely cause of the quasiperiodic oscillations observed in the radio and hard X-ray emission, which has important implications for particle acceleration and transport in the flaring sources.
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