| Popis: |
The availability of occultation measurements from GPS receivers on-board several Low Earth Orbiters (GPS/MET, CHAMP, SAC-C. . .) is opening new possibilities to the ionospheric sounding. In this context we will briefly describe several approaches developed in the last years to estimate the electron density distribution. In particular a modified technique that increases the electron density retrieval accuracy is detailed. It consists of generalizing the Abel transform of the slant TEC, taking into account the horizontal gradient of the electron content, and the topside electron content. The improvement obtained in different scenarios, at mid and low latitudes, will be shown using both synthetic and real data from the GPS/MET and CHAMP satellites. Comparison with lonosonde measurements will also be given. |
