| Budget Amount *help |
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2018: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2017: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2016: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Outline of Final Research Achievements |
Continuous monitoring of ionospheric total electron content (TEC) using networks of GNSS (global navigation satellite system) ground stations has been conducted in many countries since such networks make it possible to measure the TEC distributions in high spatial and temporal resolutions. Most of the GNSS networks are, however, built in mid latitude regions. In order to understand dynamics of ionospheric plasma at equatorial regions in more detail, it is effective to expand the observation network in low latitudes. The TEC observations are generally realized by measuring two frequency signals from GNSS satellites because only ionospheric delay depends on the frequency in ranging errors. However, multi-frequency receivers are not consumer products and their costs are much higher than those of single frequency receivers. In this study, ionospheric TEC observation method using a single frequency GPS receiver was developed.
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