Daily Global Plasmaspheric Maps Derived From COSMIC GPS Observations
Daily Global Plasmaspheric Maps Derived From COSMIC GPS Observations
复制标题
DOI：
10.1109/tgrs.2013.2294641
复制
发表时间：
2014-01
影响因子：
8.2
通讯作者：
Xiaohong Zhang;Long Tang
中科院分区：
文献类型：
--
作者：
Xiaohong Zhang;Long Tang
星座气象、电离层和气候观测系统（COSMIC）卫星的GPS精确定轨天线观测数据代表了一种新的等离子体数据来源，它具有全球分布和连续可用的特点。假设在海拔约800 ~ 20 ~ 200 km的等离子层内的所有自由电子都包含在一个薄壳中（即单层模型），利用球谐展开构造了等离子层电子含量（PEC）的每日全球等离子层图（GPMs）。我们利用该方法获得了2008年DOY 102-131的PEC图，并将PEC模式值与气象业务卫星计划（MetOp）的测量值进行了比较。估算结果表明，全球PEC值呈现出与前人研究一致的特征，具有较高的估算精度；COSMIC GPS接收机差分码偏差估计结果与30 d参考值吻合较好。在此期间，MetOp PEC测量值与GPM PEC值差的均值为1.29 TECU，表明GPM可以提供合理、高精度的PEC值。
GPS precise orbit determination antenna observations from Constellation Observing System for Meteorology, Ionosphere, and Climate (COSMIC) satellites represent a new plasmaspheric data source, which are globally distributed and continuously available. By assuming that all free electrons in the plasmasphere at an altitude range of approximately 800-20 200 km are contained in a thin shell (namely, a single-layer model), daily global plasmaspheric maps (GPMs) of plasmaspheric electron content (PEC) are constructed using a spherical harmonic expansion. We employ this method to obtain PEC maps for DOY 102-131 in 2008 and compare the PEC model values with the Meteorological Operational satellite programme (MetOp) measurements. According to the estimation results, the global PEC values show features that are consistent with previous studies and exhibit higher estimation accuracy; the estimation results of COSMIC GPS receiver differential code biases also agree well with the reference values in the 30 days. During this period, the mean rms of the differences between MetOp PEC measurements and GPM PEC values is 1.29 TECU, which suggests that GPMs can offer reasonable and high-precision PEC values.