Use FORMOSAT-3/COSMIC radio occultation observation data tostudy ionospheic additional layer

• Main Authors: Wun-Hong Wang, 王文宏
• Other Authors: Lung-Chih Tsai
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/ztahe4

碩士 === 國立中央大學 === 太空科學研究所 === 96 === The earlier study of the additional layer (F3 layer) was primarily focused on simulation and stationary observation from ionosonde. The additional layer phenomenon can only be observed from the station near magnetic equator, and so the physical mechanism is concluded mainly by the E×B vertical drift and meridional neutral wind. In this paper we use FORMOSAT-3/COSMIC radio occultation observations to demostrate the additional layer from September 2006 to August 2007. There are two types of these additional layers, which are foF2<foF3 and foF2>foF3. We have computed two types of monthly averages of two type foF3 and hmF3 values, and demostrate their global distributions and happening time. The results can be used to obtain the seasonal variations. And we have verified the relationship of the additional layer to the parameters of F10.7 and Kp. Finally, the monthly averages of foF3 and hmF3 are compared with the ionosonde observations at Fortaleza (38°W,4°S). The respective distribution time of these two types of additional layer is also compared with earlier simulation to see if they are relative.