Monitoring the Daytime Variations of Equatorial Ionospheric Anomaly Using IONEX Data and CHAMP GPS Data

Monitoring the Daytime Variations of Equatorial Ionospheric Anomaly Using IONEX Data and CHAMP GPS Data
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利用IONEX数据和CHAMP GPS数据监测赤道电离层异常的白天变化

DOI:
10.1109/tgrs.2010.2055875
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发表时间:
2011
影响因子:
8.2
通讯作者:
--
中科院分区:
工程技术1区
文献类型:
--
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提出了一种反演CHAMP卫星上空电离层电子含量的方法。2003年11月7日至12月12日期间,利用CHAMP全球定位系统数据和欧洲轨道确定中心提供的电离层地图交换格式数据,在地磁平静期间监测了赤道电离层异常(EIA)的日间行为。结果表明,在EIA变化的早期,由于白天的垂直向上漂移,等离子体聚集并上升到地磁赤道上方。CHAMP轨道上方(距地面400 km以上)主要受电磁场控制的顶侧电离层赤道等离子体被抬升到更高的高度后,开始沿沿着磁力线向下扩散到更高纬度,在CHAMP轨道上方的顶侧电离层中开始出现双峰结构。然而,在地面以上的整个电离层中仍然观察到一个波峰,并且由于跨赤道中性风的作用,这个波峰稍微移动到冬季半球。随着等离子体的不断扩散,在地磁赤道两侧的整个电离层也出现了两个波峰。
A method, which can invert the ionospheric electron content above the CHAMP satellite, is presented. The daytime behavior of the equatorial ionospheric anomaly (EIA) is monitored using the CHAMP global positioning system data and the ionosphere map exchange format data supplied by the Center for Orbit Determination in Europe during the period at quiet geomagnetic conditions between November 7 and December 12, 2003. Results show that the plasma congregates and rises above the geomagnetic equator due to the daytime upward vertical drift during the early variations of EIA. After being lifted to higher altitudes, the topside ionospheric equatorial plasma above the CHAMP orbit (over 400 km above the ground) controlled mainly by the electromagnetic field starts to diffuse downward to higher latitudes along magnetic field lines, and the double-humped structure begins to appear in the topside ionosphere above the CHAMP orbit. However, a single crest is still observed for the entire ionosphere above the ground, and this single peak moves slightly to the winter hemisphere as a result of the transequatorial neutral wind. With the continuous diffusion of the plasma, the two crests also occur for the entire ionosphere at both sides of the geomagnetic equator.
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