Ion composition measurements and modelling at altitudes from 140 to 350 km using EISCAT measurements
Ion composition measurements and modelling at altitudes from 140 to 350 km using EISCAT measurements
复制标题
DOI：
10.1007/s00585-998-1159-6
复制
发表时间：
1998-10
影响因子：
1.9
通讯作者：
A. Litvine;W. Kofman;B. Cabrit
中科院分区：
文献类型：
--
作者：
A. Litvine;W. Kofman;B. Cabrit
本工作的目的是处理数据的CP 1和CP 2程序的EISCAT电离层雷达从1987年至1994年使用的“全剖面”的方法，它允许解决的“温度成分”的模糊性问题，在低F区域。1995-1996年在CEPHAG开发了数据分析程序。为了改进这个程序，我们实现了另一个分析函数来模拟离子组成分布。这个新函数更好地反映了构图的真实的轮廓。其次，我们选择了最好的方法来选择“全剖面”过程的初始条件。对结果进行统计分析，以获得各种参数的平均值：电子浓度和温度，离子温度，成分和体积速度。目的是获得模型的参数行为定义的离子组成的配置文件：z50（原子和分子离子之间的过渡高度）和dz（宽度的配置文件），为不同的季节和高，低的太阳活动。然后将这些模型与其他模型进行比较。为了解释参数sz_（50）和dz的主要特征，我们分析了导致组分变化的过程，并将它们与产生和电子密度分布联系起来。一个新的离子组成的实验模型现在是可用的。关键词.极光电离层·离子化学和组成·仪器和技术· EISCAT
This work aims at processing the data of CP1 and CP2 programs of EISCAT ionospheric radar from 1987 to 1994 using the "full profile" method which allows to solve the "temperature-composition" ambiguity problem in the lower F region. The program of data analysis was developed in the CEPHAG in 1995–1996. To improve this program, we implemented another analytical function to model the ion composition profile. This new function better reflects the real profile of the composition. Secondly, we chose the best method to select the initial conditions for the "full profile" procedure. A statistical analysis of the results was made to obtain the averages of various parameters: electron concentration and temperature, ion temperature, composition and bulk velocity. The aim is to obtain models of the parameter behaviour defining the ion composition profiles :z50(transition altitude between atomic and molecular ions) and dz(width of the profile), for various seasons and for high and low solar activities. These models are then compared to other models. To explain the principal features of parametersz50anddz, we made an analysis of the processes leading to composition changes and related them to production and electron density profile. A new experimental model of ion composition is now available.Key words.Auroral ionosphere · Ion chemistry and composition · Instruments and techniques · EISCAT