Ionospheric Equatorial Ionization Anomaly and Equatorial Electrojet
碩士 === 國立中央大學 === 太空科學研究所 === 94 === Many studies show seasonal variations of equatorial ionization anomaly (EIA). In this thesis, the ionospheric total electron content (TEC) in the Asian sector derived from measurements of ground-based receivers of the global positioning system (GPS) is employed t...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2006
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| Online Access: | http://ndltd.ncl.edu.tw/handle/56cpwm |
| Summary: | 碩士 === 國立中央大學 === 太空科學研究所 === 94 === Many studies show seasonal variations of equatorial ionization anomaly (EIA). In this thesis, the ionospheric total electron content (TEC) in the Asian sector derived from measurements of ground-based receivers of the global positioning system (GPS) is employed to investigate the EIA variations during 1997-2005. In addition, magnetometer data from the Circum-pan Pacific Magnetometer Network (CPMN) are used to study the EIA variations associated with the equatorial electrojet (EEJ). It is found in both the northern and southern hemispheres that the EIA crests manifest remarkable seasonal variations. The EIA maxima lag those of the EEJ by about 1.5-3 hours. The results reveal the time delay of both hemispheres to be asymmetry and vary with seasons. There are obvious relations between the intensity of EEJ and EIA as well as distance between the two crests. The associated correlation coefficients are about 0.52. However, no obvious seasonal and solar activity effects are found between the two observations.
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