A global climatology of ionospheric irregularities derived from GPS radio occultation
A global climatology of ionospheric irregularities derived from GPS radio occultation
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DOI：
10.1029/2008gl034158
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发表时间：
2008-07-26
影响因子：
5.2
通讯作者：
Jacobi, C.
中科院分区：
文献类型：
--
作者：
Arras, C.;Wickert, J.;Jacobi, C.
CHAMP、GRACE-A和FORMOSAT-3/COSMIC的全球定位系统无线电掩星测量结果被用来获取2002年1月至2007年12月期间关于小尺度电离层不规则性（如零星的E层）的全球信息。这些研究是基于对GPS无线电掩星信号幅度变化的分析。电离层不规则性的全球分布显示出强烈的季节性变化，在中纬度地区的夏季出现率最高。CHAMP的长期数据集允许进行第一次气候学研究，而数据覆盖面随着CHAMP、GRACE和FORMOSAT-3/COSMIC测量的结合而大大增加。这使得全球地图的零星E发生率非常高的空间分辨率，地球磁场的影响变得可见全球零星E地图的第一次。
GPS radio occultation measurements from CHAMP, GRACE-A and FORMOSAT-3/COSMIC are used to derive global information on small-scale ionospheric irregularities such as sporadic E layers between January 2002 and December 2007. The investigations are based on the analysis of amplitude variations of the GPS radio occultation signals. The global distribution of ionospheric irregularities shows strong seasonal variations with highest occurrence rates during summer in the middle latitudes. The long-term data set of CHAMP allows for first climatological studies, while the data coverage increases significantly with the combination of CHAMP, GRACE and FORMOSAT-3/COSMIC measurements. This allows for global maps of sporadic E occurrence rates of very high spatial resolution where the influence of the Earth's magnetic field becomes visible in global sporadic E maps for the first time.