TY - JOUR A1 - Cai, H. T. A1 - Ma, S. Y. A1 - Fan, Y. A1 - Liu, Y. C. A1 - Schlegel, K. T1 - Climatological features of electron density in the polar ionosphere from long-term observations of EISCAT/ESR radar JO - Ann. Geophys. J1 - ANGEO VL - 25 IS - 12 SP - 2561 EP - 2569 Y1 - 2007/01/02 PB - Copernicus Publications SN - 1432-0576 UR - https://angeo.copernicus.org/articles/25/2561/2007/ L1 - https://angeo.copernicus.org/articles/25/2561/2007/angeo-25-2561-2007.pdf DO - 10.5194/angeo-25-2561-2007 ER -