Abstract:

The technique and data analysis of imaging riometer are presented in this paper. Some absorption effects in polar ionosphere were obtained by means of the imaging riometer at Zhongshan station during solar storms at the end of October 2003. The main features were: a sudden cosmic noise absorption (SCNA) with 2.7 dB and a polar cap absorption (PCA) lasting about 4 days with a peak up to 31 dB.