太阳耀斑发射的分米波射电尖峰的高光谱分辨率观测--凤凰-3光谱仪的初步结果
High Spectral Resolution Observation of Decimetric Radio Spikes Emitted by Solar Flares - First Results of the Phoenix-3 Spectrometer
摘要：
一台新的多通道光谱仪-Phoenix-3正在运行，它能够以前所未有的61.0千赫高灵敏度光谱分辨率观测0.1 - 5千兆赫范围内的太阳耀斑无线电发射。目前的设置为常规观测允许测量圆极化，但需要在1 - 5 GHz的范围内的4096个频率通道的数据压缩和时间分辨率为200毫秒。第一个结果是通过一个良好的观察事件，包括在350 - 850 MHz的窄带尖峰。尖峰带宽被发现有一个幂律分布，下降低于2 MHz的半高全宽（FWHM）的值。最窄尖峰的FWHM带宽小于0.3 MHz或中心频率的0.04%。最小的半功率增加发生在0.104 MHz，在443.5 MHz，这是接近于预测的自然脉泽发射宽度。尖峰的频谱被发现是不对称的，具有增强的低频尾部。总尖峰通量的分布近似为指数分布。
英文摘要：
A new multichannel spectrometer, Phoenix-3, is in operation having capabilities to observe solar flare radio emissions in the 0.1 - 5 GHz range at an unprecedented spectral resolution of 61.0 kHz with high sensitivity. The present setup for routine observations allows measuring circular polarization, but requires a data compression to 4096 frequency channels in the 1 - 5 GHz range and to a temporal resolution of 200 ms. First results are presented by means of a well observed event that included narrowband spikes at 350 - 850 MHz. Spike bandwidths are found to have a power-law distribution, dropping off below a value of 2 MHz for full width at half maximum (FWHM). The narrowest spikes have a FWHM bandwidth less than 0.3 MHz or 0.04% of the central frequency. The smallest half-power increase occurs within 0.104 MHz at 443.5 MHz, which is close to the predicted natural width of maser emission. The spectrum of spikes is found to be asymmetric, having an enhanced low-frequency tail. The distribution of the total spike flux is approximately an exponential.
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。
