Morphology in the total electron content under geomagnetic disturbed conditions: results from global ionosphere maps
Morphology in the total electron content under geomagnetic disturbed conditions: results from global ionosphere maps
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DOI：
10.5194/angeo-25-1555-2007
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发表时间：
2007-07
影响因子：
1.9
通讯作者：
Zhao Biqiang;W. Weixing;L. Libo;M. Tian
中科院分区：
文献类型：
--
作者：
Zhao Biqiang;W. Weixing;L. Libo;M. Tian
利用喷气推进实验室(JPL)TEC产品的8年全球电离层图(GIM)，对全球电离层与地磁扰动行为的形态进行了统计研究。结果表明，在地磁控制下，TEC在地磁暴期间的行为表现出明显的季节和局部时间变化，其方式与NmF2相似(field和Rishbeth，1997)。TEC的负位相在夏半球出现的概率较大，在地磁极点附近最为明显，而正位相在冬半球和远极区明显。低纬度地区的负风暴效应一般发生在午夜过后到上午，下午减弱到高纬度地区。正风暴效应是由地磁纬度和磁当地时间分开的。此外，不同地方时间段的电离层对风暴开始的响应显示出与地磁风暴演化相对应的非常不同的发展过程。白天的正风暴效应在美洲地区比亚洲和欧洲地区更为显著，这可能表明电离层风暴的纵向效应。
Using 8-year global ionosphere maps (GIMs) of TEC products from the Jet Propulsion Laboratory (JPL), we make a statistical study on the morphology of the global ionospheric behaviors with respect to the geomagnetic disturbances. Results show that the behaviors of TEC during geomagnetic storm present clear seasonal and local time variations under geomagnetic control in a similar way as those of NmF2 (Field and Rishbeth, 1997). A negative phase of TEC occurs with high probability in the summer hemisphere and most prominent near the geomagnetic poles, while a positive phase is obvious in the winter hemisphere and in the far pole region. A negative storm effect toward lower latitudes tends to occur from post-midnight to the morning sector and recedes to high latitude in the afternoon. A positive storm effect is separated by geomagnetic latitudes and magnetic local time. Furthermore, ionospheric responses at different local time sectors with respect to the storm commencement shows very different developing processes corresponding to the evolution of the geomagnetic storm. A daytime positive storm effect is shown to be more prominent in the American region than those in the Asian and European regions, which may suggest a longitudinal effect of the ionospheric storm.