超高分辨率太阳射电事件及其相关太阳活动的研究

Fine Radio Solar Structures of Super-High Temporal Resolution and Associated Solar Activities

从2004年10月起,国家天文台怀柔射电频谱仪增加了新的超高分辨率观测模式:在1.10～1.34 GHz频带其时间分辨率为1.25 ms,频率分辨率为4 MHz。报告了3个超高分辨率下观测到的太阳射电精细结构事件,包括射电尖峰辐射、鱼群结构和重叠的精细结构,在射电精细结构之后8～14 min,在米波段都发现射电II型爆发,3个事件的米波II型爆发(示踪着日冕激波)都有相关联的日冕物质抛射(Coronal Mass Ejection,CME)。

After Oct. 2004, a new observation mode has come into operation for our radio spectrometer （ Huairou, Beijing） which has a super-high temporal resolution of 1.25ms in the frequency range of 1.10- 1.34GHz. The spectral resolution is dMHz. We report here three solar radio events observed with the new mode. The images show their spikes, fish groups, and overlapping fine structures （FS）. At about 8-14min after those radio FSs, there were associated type Ⅱ meter-wave bursts （ traces of coronal shock waves） detected for all three events. Also detected were CMEs （Coronal Mass Ejections） were associated with these shock waves.