Ionograms taken from a Digisonde Portable Sounder (DPS 4) at Zhongshan Station of Antarctica in 1995 are used to analyse the mean ionospheric properties in winter. The F region is rather unstable in winter and has la...Ionograms taken from a Digisonde Portable Sounder (DPS 4) at Zhongshan Station of Antarctica in 1995 are used to analyse the mean ionospheric properties in winter. The F region is rather unstable in winter and has large diurnal variation. The monthly medium value of f oF 2 has a main peak around 0900UT when maximum value occurs and a sub peak between 1300 1500UT. It may be affected synthetically by the low energy electron precipitation in cusp region, the high latitude plasma convection and the solar radiation, resulted in so called F region magnetic noon phenomena. Low values of f oF 2 occur in post midnight (2000 0100UT) when Zhongshan Station crosses the ionospheric polar hole. Sporadic E layer which caused mostly by auroral particle precipitation can be observed almost every day with the highest value of f oE s around 1700UT. The diurnal variation of E layer is relatively smooth.展开更多
文摘Ionograms taken from a Digisonde Portable Sounder (DPS 4) at Zhongshan Station of Antarctica in 1995 are used to analyse the mean ionospheric properties in winter. The F region is rather unstable in winter and has large diurnal variation. The monthly medium value of f oF 2 has a main peak around 0900UT when maximum value occurs and a sub peak between 1300 1500UT. It may be affected synthetically by the low energy electron precipitation in cusp region, the high latitude plasma convection and the solar radiation, resulted in so called F region magnetic noon phenomena. Low values of f oF 2 occur in post midnight (2000 0100UT) when Zhongshan Station crosses the ionospheric polar hole. Sporadic E layer which caused mostly by auroral particle precipitation can be observed almost every day with the highest value of f oE s around 1700UT. The diurnal variation of E layer is relatively smooth.
