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《Chinese Journal of Geophysics》 2005-03
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Climatologic characteristics of high-latitude ionosphere ——EISCAT observations and comparison with the IRI model

CAI Hong-Tao1, MA Shu-Ying1, K. Schlegel2 1 Department of Space Physics, College of Electronic Informatics, Wuhan University, Wuhan 430072, China 2 Max-Planck Institute fuer Aeronomie, D-37191 Katlenburg-Lindau, Germany  
With EISCAT (European Incoherent Scatter) radar observations during 1988~1999, the climatologic features of electron densities in the auroral ionospheric F-region have been investigated statistically and compared with the IRI-2001 model for different seasons at different phases of the solar cycle. The electron densities from EISCAT observations show obviously the well-known winter anomaly in solar maximum and a semiannual variation in solar minimum. The averaged 2-D distributions of EISCAT N_e versus t_ UT and height H, as well as diurnal variations of TEC up to 500 km, are reasonably consistent with those predicted by the IRI-2001 model as a whole. The height profiles of N_e, however, are remarkably different between the IRI model and the EISCAT observations around the time when the TEC reaches its maximum. In this case the electron density above F_2 peak is too large in the IRI-2001 model, causing higher TEC than EISCAT observations. On the other hand, EISCAT observations show obviously characteristics of a semiannual variation at the fall phase of solar activity, however, the results of IRI-2001 model show no evidence of that.
【Fund】: 国家重点基础研究发展规划 973项目 (G2 0 0 0 0 7840 7)资助
【CateGory Index】: P352
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