Abstract:

In this paper,the Polar Mesosphere Summer Echoes(PMSE) are studied with observations of a Digisonde Portable Spunder-4(DPS-4) at Zhongshan Station,Antarctica.It is confirmed that the phenomenon of the PMSE-Es can be identified at MF and HF bands by analyzing the ionospheric E and Es layer's irregular characteristics.There are similarities between Arctic PMSE and Antarctic PMSE-Es in variations of the occurrence rate,such as seasonal variation,diurnal variation and semidiurnal variation,although some discrepancies exist.Finally the discrepancies in diurnal and semidiurnal variations are discussed and could be roughly explained with the distribution of the aurora oval.