The observation of plasmaspheric electron content by FORMOSAT-3/COSMIC

• Main Authors: Chao-Yen Chen, 陳朝焱
• Other Authors: Jann-Yenq Liu
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/66800747398142778778

碩士 === 國立中央大學 === 太空科學研究所 === 97 === Previous studies examine changes of the electron density in the bottomside ionosphere, and however the total electron content (TEC) of the topside ionosphere and/or the plasmasphere has not been investigated in detail. This thesis derives the TEC from 800km to 20200km, termed the plasmaspheric electron content (PEC), by excess time delay of GPS signals recorded by the POD antenna onboard FORMOSAT-3/COSMIC (F3/C). Meanwhile, the electron density profile and its associated TEC (IEC) from 90km to 800km can be derived by using radio occultation technique in GPS Occultation Experiment of F3/C. On the other hand, the TEC from the ground to the 20200km of the GPS satellite altitude (GEC) of Global Ionospheric Map (GIM) are routinely reported every two hours. Therefore, the difference between GEC and IEC (i.e. DEC) also represents the TEC between 800km and 20200km. Both diurnal and seasonal variations of the PEC and GEC in 2007 and 2008 are investigated Results show that PEC/DEC decrease polarward from magnetic equator and yield symmetry futures the southern and northern hemisphere in each season. In longitude, there are some PEC/DEC peaks alone the magnetic equator which reveal an obvious the seasonal difference between the Atlantic and South America area.