摘要
在80－500km范围内考虑了3种中性成份的4种离子，从严格的电子和离子密度连续方程出发，对中性风和扩散效应进行了全面、连续的考虑，由此建立了一种电离层的物理模式；在此模式的基础上针对北京地区分别对太阳活动低年（F(10.7)＝60）、高年（F_(10.7)＝300）的春（DOY＝90）、夏（DOY＝180）、秋（DOY＝270）、冬（DOY＝365）进行计算，并将所得结果与IRI－90进行了比较．结果表明：E层为典型的Chapman层：E－F谷区深度一般为0．2—0．5之间，比IRI要深；F_1缘在太阳活动低年的四季都出现，其中夏天最明显，已形成了一个F_1层，冬天最不明显，仅表现为一个轻微的凸缘，在太阳活动高年只有夏天出现了F_1凸缘，这与现有理论相符合，而IRI－90较少出现明显的F_1缘；F_2层的电子密度是活动高年比低年大，平均冬天比夏天大，这与观测结果也基本符合．
A physical model for ionospheric vertical profile is established, taking into ac-count four species of ions and electrons in the region of 80-500 km. Neutral windand ions' motion are both involved in the continuity equations for those five species.Ionospheric proflles in different seasons at low and high solar activities are calcu-lated and compared with the results from IRI-90. Results show that E region is atypical Chapman layer and the depth of E-F valley is generally 0.2-0.5 which isdeeper than that given by IRI-90. That the F1 ledge is most obvious in summerat low solar activity is consistent with widely accepted theories, but the F1 ledgeseldom appear in IRI-90. In F2 region, the electron number density at high solaractivity is greater than that at low solar activity, and in winter is greater than thatin summer. rhese all agree with observations rather well.
出处
《空间科学学报》
CAS
CSCD
北大核心
2000年第2期103-112,共10页
Chinese Journal of Space Science
基金
国家自然科学基金!49990454
49874041
