磁层-电离层-热层耦合的模式计算和分析

MODEL CALCULATION AND ANALYSIS OF THE MAGNETO- SPHERE-IONOSPHERE-THERMOSPHERE COUPLING

对磁层-电离层电动耦合和电离层发电机两种效应进行了模式计算,并对所得的一些耦合现象作了综合讨论.结果表明,在中低纬和赤道区的电离层和地磁研究中必须考虑磁层-电离层耦合效应向中低纬区的穿透和屏蔽;潮汐发电机效应对极光区(电导率增高时)的作用也值得重视.这两效应的特征和相对重要性随磁暴的发展阶段而异,在高低纬区也各不相同,但都有明显的晨昏不对称性.此外,弱磁扰对中低纬电离层形态的影响也不容忽视.

Model calculations are used to analyse fhe function of the magnetosphere-ionosphere elec-trodynamic coupling and that of the ionospheric tide-dynamo. The phenomena concerned are discussed.It is shown that in the geomagnetic and ionospheric research of low-latitude and equatorial areas, the penetrating and shielding of magnetospheric disturbance should be taken into account. On the other hand, the effect of tidal dynamo on the ionosphere of auroral area should not be ignored either,especially on geomagnetic disturbed days when conductivity is very high The feather and the relative importance of these two effects are different at different stages of a storm and depend on latitudes. There is an evident dawn-dusk asymmetry in these effects. The influence of weak geomagnetic disturbances on the feature of the low-latitude ionosphere could not be neglected either.