太阳微波尖峰的空间谱分析

Space Spectrum Analysis of Solar Microwave Spikes

利用国家天文台怀柔太阳观察站2．6～3．8GHz频谱仪的观察数据，对太阳射电辐射中的8个尖峰辐射事件进行了分析。在把频率标度转变成太阳大气中的高度之后，得到了时间一太阳大气高度对应二维数据；对任意时刻的太阳流量数据向量经过小波变换和将小波变换后二维图形转变为一维图形后，得到类似傅里叶变换的功率谱图。同时也利用傅里叶谱分析方法对同样的数据进行对比分析，分别直线拟合一维功率谱图，得到幂率功率谱指数，发现大多数指数与典型的科莫戈洛夫功率谱指数相背离，并且阐述了可能存在的原因。

Using the spectrum data obtained by the 2.6 - 3.8 GHz solar radio spectrometer located at the Huairou Solar Observational Station of National Astronomical Observatories, 8 spike emission events are analysed. After making a transformation of the frequency to the solar atmospheric height, a 2D array of time versus solar atmospheric height is obtained. For the variation of solar radio flux at any time, a wavelet transform and a Fourier transform are performed. By adding the wavelet spectrum along the time the global wavelet spectrum is got that is very similar to the Fourier one. Through a linear fit to both of the above spectra, the corresponding power - law indexes of solar radio flux can be calculated. As a result, it is found that most of them are largely different from the Kolmogrov one. Some possible reasons are put forward.