中性风对赤道电离异常的影响

The effect of neutral wind on the Equatorial Ionization Anomaly

利用太阳活动中-高年期间的GRACE卫星观测,反演顶部电离层电子密度,分析赤道电离异常(Equatorial Ionization Anomaly,EIA)随地方时和地理经度的变化特征,进而分析:中性风对EIA发展的影响.结果表明:EIA强度表现出显著的随地方时和地理经度的变化,EIA强度随地理经度的变化与等离子体泡的经度变化特性相似.EIA强度主要取决于EIA槽附近的电子密度,EIA强度对EIA区电子密度的依赖还随地方时和季节变化.中性风对EIA的发展有着重要作用.

Using the electron density in topside ionosphere inferred from GRACE satellite observations during mediumhigh solar activities,variations of Equatorial Ionization Anomaly(EIA)with local time and longitude were studied.Furthermore,the effect of neutral wind on the EIA development was investigated.The results show that the variation of EIA strength depends on local time and longitude,which is similar with the longitudinal variations of plasma bubble.EIA strength is mainly related to the electron density above the trough,and relationship between EIA strength and density above the trough also depends on local time and season.Neutral wind plays an important role in the development of EIA.