A new technique for mapping of total electron content using GPS network in Japan

被引:259
作者
Otsuka, Y [1 ]
Ogawa, T
Saito, A
Tsugawa, T
Fukao, S
Miyazaki, S
机构
[1] Nagoya Univ, Solar Terr Environm Lab, Nagoya, Aichi, Japan
[2] Cornell Univ, Sch Elect & Comp Engn, Ithaca, NY 14853 USA
[3] Nagoya Univ, Grad Sch Sci, Dept Geophys, Nagoya, Aichi, Japan
[4] Kyoto Univ, Radio Sci Ctr Space & Atmosphere, Kyoto, Japan
来源
EARTH PLANETS AND SPACE | 2002年 / 54卷 / 01期
关键词
D O I
10.1186/BF03352422
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
The dual frequency radio signals of the Global Positioning System (GPS) allow measurements of the total number of electrons, called total electron content (TEC), along a ray path from GPS satellite to receiver. We have developed a new technique to construct two-dimensional maps of absolute TEC over Japan by using GPS data from more than 1000 GPS receivers. A least squares fitting procedure is used to remove instrumental biases inherent in the GPS satellite and receiver. Two-dimensional maps of absolute vertical TEC are derived with time resolution of 30 seconds and spatial resolution of 0.15degrees x 0.15degrees in latitude and longitude. Our method is validated in two ways. First, TECs along ray paths from the GPS satellites are simulated using a model for electron contents based on the IRI-95 model. It is found that TEC from our method is underestimated by less than 3 TECU. Then, estimated vertical GPS TEC is compared with ionospheric TEC that is calculated from simultaneous electron density profile obtained with the MU radar. Diurnal and day-to-day variation of the GPS TEC follows the TEC behavior derived from MU radar observation but the GPS TEC is 2 TECU larger than the MU radar TEC on average. This difference can be attributed to the plasmaspheric electron content along the GPS ray path. This method is also applied to GPS data during a magnetic storm of September 25, 1998. An intense TEC enhancement, probably caused by a northward expansion of the equatorial anomaly, was observed in the southern part of Japan in the evening during the main phase of the storm.
引用
收藏
页码:63 / 70
页数:8
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