风感应的电离层电流密度

The Ionospheric Current Density Driven by the Wind

本文用MSIS-86和IRI-86两模式提供的基本参数,计算了热层风,电离层电导率和电流密度的三维分布,从而将静态模式扩展应用来解决高层大气动力学和电动力学中的问题。扩展所得之新参数分布形态与现有的许多有关观测及理论研究结果大致相符,而电流密度垂直分布的细致结构则是其他方法很难获得的。这对深入研究电离层发电机、热层-电离层耦合、以及阐明磁扰条件下E层的复杂形态都是有意义的。

The purpose of the paper is to calculate the three-dimensional distribution of the thermospheric wind, ionospheric conductivity and current density by using the atmospheric and ionospheric models of MSIS-86 apd IRI-86, and to applicate the static mo- dels to resolve the problems of upper atmospheric dynamics and electrodynamics. The main results from the model calculation given in this paper are the following.1. During periods of high geomagnetic activity, the relative enhancement of south and west components of the thermospheric wind system at middle latitudes is caused by high-latitude charged particles precipiation and Joule heating,altering the global thermospheric circulation.2. Under geomagnetically disturbed condition, the increase of conductivity can be seen clearly at high latitudes, but is not obvious at middle and low latitudes.3. During geomagnetic disturbed days, the ionospheric current density increases evidently, not only at high latitudes, but also at middle latitudes, where, the east and south components of ionospheric current density increase evidently.4. At middle and low latitudes, the current densities in the E region have a complicated vertical profile at noon time, It is very difficult to obtain such structure by other methods.These conclusions are agreed well with observations and concerned model calculations.