【摘要】 采用AE-D卫星上中性大气数密度的观测资料 ,分析了 1 975年 1 1月内多次磁暴期间热层大气中氦和原子氧与氮分子之数密度比值的变化 .结果表明 ,磁暴对中性大气加热的理论是符合实际情况的 .低热层大气受热抬升使较高高度上的大气中质量较轻成分的数密度相对比例有明显下降 ,而较重成分的百分比则有增加 .与地磁宁静期间相比 ,在 1 40—1 6 0km高度上n(He) /n(N2 )之比值降低了一个数量级 ,而n(Ar) /n(N2 )的增幅则略大于一个数量级 .此比值的变化幅度大小随高度而变 ,但各高度上暴时变化的发展趋势是基本一致的 .更多还原

【Abstract】 Using the neutral atmospheric data of number density radio of n (He)/ n (N 2) and n (O)/ n (N 2), from the satellite AE D we analyse their variations during magnetic storms in November, 1975. The results indicate that the response of atmospheric constituents to the geomagnetic heating is basically coincided with that expected from related theory. The lifting of the neutral atmosphere with higher proportion of heavier constituents (such as N 2 and Ar) leads to a relative decrease of the concentration of lighter constituents (such as He and O). The ratio of n (He)/ n (N 2) decreases by about one order of magnitude at 150km, while n (Ar)/ n (N 2) increases by a little more than one order of magnitude, as compared with that during magnetic quiet day. The variation of number density ratio varies with altitude, but their developing tendencies with storm time at different heights are similar. [更多还原