抄録
This research describes a high-speed method, which detects automatically whistler dispersion, to be used for determination of a global electron density distribution in the ionosphere and plasmasphere. It is required in order to know the detailed state of plasma. It is necessary to observe the electron density distribution in the ionosphere in a short time scale, a day or shorter. A Japanese scientific satellite, “Akebono (EXOS-D)” has been used for various observations in the ionosphere and plasmasphere. The electron density distribution in these areas can be estimated from the propagation delay time of the whistler phenomenon, which is generated by electric discharge of the lightning on the ground and is observed by the satellite, the procedure to determine the distribution is to find a theoretically deduced model in which calculated propagation delay time fits the observed delay time. The purpose of this study is to reduce the analysis time of the delay (dispersion) of whistlers observed by Akebono, using a patterm recognition technique, so called “Hough Transform”
