太阳射电微波爆发谱与HXR的统计研究

The statistics analysis is carried out for some coincident event data on solar microwave bursts and HXR bursts. Some significant results and reasonable proposition are presented.     

A pair of solar spike emissions

Using the 2.6-3.8 GHz solar radio spectrometer of the National Astronomical Observatories of China (NAOC), a pair of microwave millisecond spike (MMS) emissions were observed, and their frequency drift rate was measured. The separatrix frequency of the MMS pair was at 2900 MHz. Its emission layer was about 2×104km above the photosphere. The polarization degree was wave-like variation with an average value of about 25% in LCP. An MMS pair differs greatly from the type III bursts pair. For the latter, in a certain frequency range, there is no emission around separatrix frequency. This phenomenon may help better understand the mechanism of MMS.     

Nonlinear calibration and data processing of the solar radio burst

The processes of the sudden energy release and energy transfer, and particle accelerations are the most challenge fundamental problems in solar physics as well as in astrophysics. Nowadays, there has been no direct measurement of the plasma parameters and magnetic fields at the coronal energy release site. Under the certain hypothesis of radiation mechanism and transmission process, radio measurement is almost the only method to diagnose coronal magnetic field. The broadband dynamic solar radio spectrometer that has been finished recently in China has higher time and frequency resolutions. Thus it plays an important role during the research of the 23rd solar cycle in China. Sometimes when there were very large bursts, the spectrometer will be overflowed. It needs to take some special process to discriminate the instrument and interference effects from solar burst signals. According to the characteristic of the solar radio broadband dynamic spectrometer, we developed a nonlinear calibration method to deal with the overflow of instrument, and introduced channel-modification method to deal with images. Finally the interference is eliminated with the help of the wavelet method. Here we take the analysis of the well-known solar-terrestrial event on July 14th, 2000 as the example. It shows the feasibility and validity of the method mentioned above. These methods can also be applied to other issues.     

太阳射电爆发中2个有意义的事件及其分析

提供了太阳微波爆发中的２个有意义的观测事件：１９８９年与ＡＲ５３９５成协的具有对双峰／三峰结构的准周期振荡和１９９０年５月２３日与ＡＲ６０６３成协的叠加在微波爆发上的精细结构，并进一步用电流环结合模型给出了解释。     

用电流环结合模型解释微波爆发中的FS现象

利用Tajima和Sakai提出的解释太阳耀斑现象的电流环结合模型,分析了短厘米波段微波爆发中的精细结构现象.结果表明,观测事实是对这一新的理论模型的有力支持.