磁偏角和热层风对中纬电离层TEC经度分布的影响

本文利用北美、南美和大洋洲三个地区的电离层TEC数据,分析了磁偏角为零的经度线两侧中纬电离层TEC的差异.结果表明,在2001年至2010年的几乎所有季节,在磁偏角为零的经度东西两侧,北美、南美和大洋洲中纬电离层TEC都存在规则性的差异;中纬电离层TEC的这种经度差异显著地依赖地方时,对季节和太阳活动水平也有不同程度的依赖.地磁场影响下电离层与热层动力学耦合的分析表明,磁偏角的经度变化和热层风的地方时变化两者的共同作用是引起磁偏角为零的经度两侧中纬电离层TEC差异的重要原因之一.

Effects of declination and thermospheric wind on TEC longitude variations in the mid-latitude ionosphere

Based on measurements of ground-based TEC station network in about a solar activity from 2001 to 2010, the differences of the mid-latitude ionospheric TEC in the east and west of north America, south America and Oceania have been analyzed in this paper. The results show that for nearly all seasons from 2001 to 2010 and in both sides of the longitudes with zero declination, the mid-latitude ionospheric TEC at north America, south America and Oceania have systemic differences and the features of these differences markedly depend upon the local time but less depend upon season and levels of solar activity. Theoretical analysis shows that the longitude variations of both declination and zonal thermospheric wind are one of the important factors to cause differences of the mid-latitude ionospheric TEC in both sides of the longitudes with zero declination.