| 太阳活动高年上电离层中O+-H+离子过渡高度的特征 |
| |
| 引用本文： | 刘选谋 Davies,K.太阳活动高年上电离层中O+-H+离子过渡高度的特征[J].地球物理学报,1993,36(2):141-148. |
| |
| 作者姓名： | 刘选谋 Davies K |
| |
| 作者单位： | 1. 武汉大学空间物理与电子信息学系, 武汉 430072;
2. NOAA/SEL Boulder, Co. 80303, U.S.A. |
| |
| 摘 要： | 本文用日本电离层探测卫星ISS-b的资料,假设F2层峰顶以上电离层中各类离子随高度呈扩散平衡分布,得到了太阳活动高年（1978年8月-1979年8月）确定顶外电离层电子密度剖面形状的一个重要参数,即O+-H+离子过渡高度hT的一些变化特征.指出hT的日变化特性主要受电离层中O+离子的产生与复合作用的控制.太阳活动高年在不同纬度和所有经度区域,平均说来日间hT为大约1500-2500km变化,而夜间位于800-1400km,冬夜甚至接近中性氢、氧原子的化学平衡高度.过渡高度也表现出明显的纬度关系,在接近±20°的磁赤道地区,hT基本上不随纬度变化;但在大于±30°磁纬区域hT随纬度很快增加.义中还就hT随时间和地磁（或地理）纬度变化的机制作了简要讨论.
|
| 关 键 词： | 过渡高度 扩散平衡 电子密度剖面 等离子体温度 |
| 收稿时间： | 1992-01-16 |
THE HEIGHT OF O+-H+ TRANSITION IN THE TOPSIDE IONOSPHERE AT SOLAR MAXIMUM |
| |
| LIU XUAN-MOU.THE HEIGHT OF O+-H+ TRANSITION IN THE TOPSIDE IONOSPHERE AT SOLAR MAXIMUM[J].Chinese Journal of Geophysics,1993,36(2):141-148. |
| |
| Authors: | LIU XUAN-MOU |
| |
| Institution: | 1. Department of Space Physics, Wuhan University, Wuhan 430072;
2. NOAA, Space Environment Laboratory, Boulder, Co. 80303, U. S. A. |
| |
| Abstract: | In this paper, the data of Ionosphere Sounding Satellite-b（ISS-b） in Japan during the sun-spot maximum from August 1978 to August 1979 were examined. Some features of transition height, hT, an important paramter controlling profile shape of electron denstity in the topside ionosphere are given under the assumption that the ion densities vary in height with diffusive equilibrium. It is shown that the diurnal variations of transition height are dominated primarily by the production and loss of oxygen ions（O +） in the ionosphere. On average, at solar maximum, daytime transition heights vary from about 1500km to 2500km and nighttime transition heights lie in a range 800-1400 km at different latitudes for the whole longitudes. In the winter night, transition height would occur near the height for chemical equilibrium of neutral oxygen and hydrogen. The transition height shows a pronounced latitude dependence. In low latitudes near ±20°, transition heights are approximately independent of latitude, but above geomagnetic latitude ±30°, transition height increases rapidly with latitude. The mechanism of variation in hT with time and geomagnetic （or geographic） latitude and longitude is briefly discussed. |
| |
| Keywords: | Transition heivh Diffusive equilibrium Profile of electron density Plasma temperature |
| 本文献已被 CNKI 维普 等数据库收录！ |
| 点击此处可从《地球物理学报》浏览原始摘要信息 |
| 点击此处可从《地球物理学报》下载免费的PDF全文 |
|
