| Popis: |
Venus is a non-magnetized planet that possesses a dense atmosphere. These characteristics are common to Mars and Titan and form the fundamental basis for categorizing celestial bodies in terms of how the solar wind interact to their upper atmospheres. ENA imaging has been considered as a powerful tool to remotely study a celestial object’s interaction with the space plasma environment. Studies have shown that ENA imaging can be used to diagnose plasma processes in the global scale such as characterization of solar wind interaction processes with non-magnetized planets. In this study, the raw mode data from Neutral Particle Detector (NPD) on-board the Venus Express was used. By using Time-of-flight (TOF) data, the peak of TOF within the range of 100 - 600 ns was mapped to a global figure of Venus. The corresponding maximum of the count rate and Half-Width-Half-Maximum were also mapped for analysis. Results show the various features that can be characterized by their respective energies and count rates, i.e. the dependence of the TOF measurements on the space and time in the vicinity of Venus. These energies agree with the theoretical values if the source signals are ENAs in origin. |
