经纬向传播的甚低频台站信号对太阳耀斑响应特征的差异性分析

为了揭示太阳耀斑发生期间沿着经纬向传播的甚低频台站信号受到扰动的差异性,文章基于随州观测站的甚低频数据,分析了2017年9月8日经向传播的NWC台站信号和纬向传播的JJI台站信号对太阳耀斑的响应特征,比较了两条路径上信号的幅度对同一太阳耀斑响应的异同.结果表明:NWC信号的响应只有先上升再恢复1种,而JJI信号有先上升...

Difference analysis of response characteristics to solar flares of very low frequency transmitter signals propagating along with longitudinal and latitudinal directions

Based on the very low frequency (VLF) data obtained from Suizhou observation station, we analyze the amplitude response characteristics, including the similarities and the differences between the longitudinal propagated NWC signal and the latitudinal propagated JJI signal, to reveal the differences in the disturbances of the VLF transmitter signals propagating along these two paths during the solar flares. It is shown that the NWC signal has only one mode of response, that is, to rise first and then recover, while the JJI signal has three modes of responses, including the rise before recovery, the fall before recovery, and the rise-and-fall before recovery. The response startup time and the peak time of the NWC signal are consistent with those of the JJI signal, but the response duration of the JJI signal is longer than that of the NWC signal. The maximum disturbance of the M-class solar flares to the NWC signal is between 1 dB and 4 dB, the maximum disturbance of the JJI signal is between 1 dB and 3 dB, and the maximum disturbance of the C-class solar flares to the two station signals is between 0 to 1 dB. The integral disturbed amplitude to the station signal is linearly correlated with the integrated X-ray flux, and the slope of the fitting line for the NWC signal is greater than that for the JJI signal.