曲靖地区电离层准6日扰动与MLT大气行星波的相关性

Correlation between the quasi 6-day oscillation in the Ionosphere and atmospheric planetary waves in the Mesosphere-lower Thermosphere at Qujing, China

利用曲靖地区(25.6°N,103.8°E)2008年9～11月共2个月的MF雷达风场数据和电离层垂直探测数据,分析了中层低热层(MLT)大气行星波,电离层Es和F层的准6日行星波状扰动特性.结果表明,电离层foEs的准6日行星波状扰动与MLT大气纬向风场中的准6日行星波存在紧密相关性,后者通过调制半日潮汐间接影响Es层.电离层F区未出现显著的准6日行星波状扰动.这些结果提供了大气行星波与电离层Es层相互耦合的实验证据,加深了对我国低纬地区电离层空间天气扰动特性的认识.

MF radar derived wind measurements and ionosonde data taken above Qujing （25.6°N, 103.8°E） from September to November 2008 are used to investigate the relationship between the atmospheric planetary wave in the mesosphere-lower thermosphere （MLT） and the quasi 6 day oscillation in the ionosphere. The results show that there is strong correlation between the quasi 6 day oscillation in the critical frequency of the sporadic E layer （foEs） and that of the zonal wind, which is related to the atmospheric planetary wave. This quasi 6 day atmospheric planetary wave in the MLT indirectly influences the Es layer by modulating the semidiurnal tides. No obvious planetary type oscillations seem to occur in the F region. These results could act as the experimental evidence for the coupling between the atmosphere planetary wave and ionospheric Es layer, which allows understanding of the ionospheric space-weather properties in low latitude regions of China.