Model results for the ionospheric lower transition height over mid-latitude
Model results for the ionospheric lower transition height over mid-latitude
复制标题
中纬度地区电离层低转变高度的模型结果
DOI：
10.5194/angeo-22-2037-2004
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发表时间：
2004-06
影响因子：
1.9
通讯作者：
S.-R. Zhang
中科院分区：
文献类型：
--
作者：
Lei J.;L. Liu;W. Wan;S.-R. Zhang
本文进行了电离层低跃迁高度（LTH）的理论计算，即O +和分子离子密度相等的水平，并与Zhang等人（1996）的实证模型进行了比较。本文通过引入离子组成分析的AE-C数据，对LTH模拟进行了详细的定量研究，并在模拟的基础上建立了新的LTH经验模型，对前人的工作进行了实质性的扩展。结果表明：(1)计算的地表温度总体上在11-13 LT附近最低，在午夜后达到日最大值（约为01 - 02 LT）。(2)模拟的地表温度在夜间表现出明显的半年变化，而在白天则表现出明显的年变化。(3)模拟LTH在夜间随太阳活动增加而增加，白天随太阳活动减少，而标准IRI选项在夏季和春分的夜间则相反。因此，模拟LTH的昼夜差异随着太阳活动的增加而显著增大。(4)随着地磁活动Ap指数的增加，白天和夜间LTHs均呈增加趋势，平均斜率约为0.1455 km / Ap单位。(5) LTH的日变化大于20 km，远远大于F107=100和Ap=10条件下的季节变化。因此，LTH的日活动和太阳活动变化比其季节和磁活动变化更为明显。
Theoretical calculations of the ionospheric lower transition height (LTH), a level of equal O + and molecu- lar ion densities, were performed and compared with em- pirical models by Zhang et al. (1996). This paper repre- sents a substantial extension of the prior work by including the AE-C data of ion composition analysis and by detailed quantitative studies of the LTH simulation, and by creating a new LTH empirical model based on our simulations. Re- sults show that: (1) the calculated LTH, in general, is low- est near 11-13 LT and reaches the diurnal maximum after midnight (about 01 02 LT). The local time asymmetry be- comes more evident in summer, when the time of minimum shifts to 16 LT. (2) The simulated LTH presents a dominant, semiannual variation during nighttime, and a pronounced an- nual variation during daytime. (3) The simulated LTH in- creases with solar activity at night and decreases by day, while the standard IRI option has an opposite tendency at night in summer and equinox. Therefore, the day-night dif- ference of simulated LTH significantly increases with solar activity. (4) Both daytime and nighttime LTHs, tend to in- crease with the increasing geomagnetic activity Ap index, with a mean slope about 0.1455 km per Ap unit. (5) The di- urnal variation of LTH is found to be more than 20 km, which is much larger than the seasonal variation under F107=100 and Ap=10. Thus, the diurnal and solar activity variations of LTH are more pronounced than its seasonal and magnetic activity variations.
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影响因子：
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作者：
J. Titheridge
通讯作者：
J. Titheridge
DOI：
10.1016/0045-8732(83)90106-7
发表时间：
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期刊：
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影响因子：
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影响因子：
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