Abnormal distribution of ionospheric electron density during November 2004 super-storm by 3D CT reconstructions from IGS and LEO/GPS observations

Abnormal distribution of ionospheric electron density during November 2004 super-storm by 3D CT reconstructions from IGS and LEO/GPS observations
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根据 IGS 和 LEO/GPS 观测数据进行 3D CT 重建,得出 2004 年 11 月超级风暴期间电离层电子密度的异常分布

DOI:
10.1007/s11431-012-4791-z
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发表时间:
2012-03
期刊:
Science in China - Series E: Technological Sciences
影响因子:
--
通讯作者:
Lühr H
Lühr H
中科院分区:
其他
文献类型:
--
作者:
XIAO Rui;XU JiSheng;MA ShuYing1;XIONG Chao;Lühr H

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利用CHAMP/GRACE卫星和IGS联合地面站GPS观测数据,采用三维时变层析成像方法,重建了2004年11月超级暴期间低纬电离层电子密度分布。利用CHAMP和GRACE卫星的实测数据对重建的电子密度进行了验证。CT重建结果表明,风暴第一主相(11月8日)的长时间正风暴相主要是由于F2峰以上F区上部电子密度增强所致。CT成像发现,在风暴主相期间(11月8日上午),赤道电离异常区出现大礼帽状的F2-3双层。在157°E附近的纵向扇区中,在Dstand的最小值附近发现了柱状增强电子密度结构,它从电离层顶侧向等离子体层延伸,最高可达2000 km左右。他们的足迹屹立在EIA的两座高峰上。
Using time-dependent 3D tomography method, the electron density distributions in the low-latitude ionosphere during November 2004 super-storm are reconstructed from GPS observations of joint ground-based IGS network and onboard CHAMP/GRACE satellites. The reconstructed electron densities are validated by satellitein situmeasurements of CHAMP and GRACE satellites. It is indicated by computer tomography (CT) reconstructions that the long-lived positive storm phase during the first main phase of the storm (November 8) is mainly attributed to enhancement of electron density in the upper F region above the F2 peak. It is found by the CT imaging that the top-hat-like F2-3 double layers occurred in the equatorial ionization anomaly region during the main phase of the storm (at forenoon of November 8). The structures of column-like enhanced electron density are found at the time near the minimum ofDstand in the longitudinal sector about 157°E, which extend from the topside ionosphere toward plasmasphere, reaching at least about 2000 km as high. Their footprints stand on the two peaks of the EIA.
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