Abstract:

An imaging riometer with 8×8 antenna array was installed successfully at Chinese Zhongshan Station,Antarctica in January 1997.The structure and working principle of the instrument are described. The first set of observation data is analyzed and the QDC are deduced. Preliminary result show that cosmic noise absorption events is very different between night side and magnetic noon during the measurement over Zhongshan Station. In night side,there are often short duration impulsive absorption events with large absorption area in the northern side of the station,stretching in east west direction. In magnetic noon the absorption events is continuous,which last for more than 1 hour and with absorption area strengthen at northern and southern sides and weaken in the middle. It is thought that the absorption is caused by aurora particle precipitation in night side and by other particle precipitation or convection in cusp at magnetic noon.