Acceleration and dynamics of energetic particles in the Jovian magnetosphere

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To study the acceleration and dynamics of energetic particles in the Jovian magnetosphere, the development of the observation system for Jovian synchrotron radiation was performed.(1) After the improvement and adjustment of the observation system, the performance experiments was carried out. And the system has been established.(2) The software for the automatic operation, including the phase and gain calibration was successfully completed, which are essential to detect the absolute intensity of the Jovian synchrotron radiation for a long term.(3) The simultaneous observations of the Jovian synchrotron radiation at Kiso and Fuji observatories, Nagoya University, using the 327 MHz radio telescopes were carried out, and detected the daily variation of the radiation.(4) From the analyzes of the energetic particle data provided from NASA database, the response of the Jovian magnetopause for the solar wind variation and particle boundary in the Jovian magnetosphere were derived.(5) The data analyzes of the Ulysses spacecraft, the periodic modulation of Jovian energetic electrons with the period of about 40 min was discovered in interplanetary space(6) The dynamics of the earth's radiation belts was studied as the counter part of the Jovian radiation belt. From the detailed investigation of energetic electrons, unexpected pitch angle distributions in the equatorial region in the inner magnetosphere were discovered, which is strongly related to the intense plasma waves called EPWAT (equatorial plasma wave turbulence).(7) The dynamics of the outer radiation belt associated with magnetic storms was studied, and proposed the mechanism to accelerate hot electrons to relativistic energies through the interaction with the storm time whistler mode waves.