On the mechanism of the post-midnight winter NmF2 enhancements: dependence on solar activity
On the mechanism of the post-midnight winter NmF2 enhancements: dependence on solar activity
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DOI：
10.1007/s00585-000-1422-y
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发表时间：
2000-11
影响因子：
1.9
通讯作者：
A. Mikhailov;Matthias Förster;T. Leschinskaya
中科院分区：
文献类型：
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作者：
A. Mikhailov;Matthias Förster;T. Leschinskaya
利用Millstone Hill IS雷达观测资料，分析了不同太阳活动水平下NmF 2峰的形成机制。热层风和等离子体层向下通量导致的hmF 2夜间增加是NmF 2峰值形成的关键过程。在这个过程中，电子温度与电子密度的变化呈相反的符号。这一机制提供了一个一致的米尔斯顿山的意见，对一套主要参数。观测到的夜间NmF 2峰值振幅随太阳活动的减小是由于复合效率的增加比等离子体层通量的增加快。E × B等离子体漂移对高太阳活动时NmF 2夜间峰值的形成是无效的. Keywords：电离层（电离层-大气相互作用;中纬度电离层;等离子体温度和密度）
The mechanism of theNmF2peak formation at different levels of solar activity is analyzed using Millstone Hill IS radar observations. ThehmF2nighttime increase due to thermospheric winds and the downward plasmaspheric fluxes are the key processes responsible for theNmF2peak formation. The electron temperature follows with the opposite sign the electron density variations in this process. This mechanism provides a consistency with the Millstone Hill observations on the set of main parameters. The observed decrease of the nighttimeNmF2peak amplitude with solar activity is due to faster increasing of the recombination efficiency compared to the plasmaspheric flux increase. TheE×Bplasma drifts are shown to be inefficient for theNmF2nighttime peak formation at high solar activity.Key words:Ionosphere (ionosphere-atmosphere interactions; mid-latitude ionosphere; plasma temperature and density)