| Budget Amount *help |
¥43,940,000 (Direct Cost: ¥33,800,000、Indirect Cost: ¥10,140,000)
Fiscal Year 2022: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2021: ¥5,460,000 (Direct Cost: ¥4,200,000、Indirect Cost: ¥1,260,000)
Fiscal Year 2020: ¥8,970,000 (Direct Cost: ¥6,900,000、Indirect Cost: ¥2,070,000)
Fiscal Year 2019: ¥8,970,000 (Direct Cost: ¥6,900,000、Indirect Cost: ¥2,070,000)
Fiscal Year 2018: ¥15,080,000 (Direct Cost: ¥11,600,000、Indirect Cost: ¥3,480,000)
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| Outline of Final Research Achievements |
To reveal the particle acceleration process by wave-particle interactions in planetary magnetospheres, we carried out (1) spacecraft data analysis, (2) numerical simulations, and (3) development of the method for the wave-particle interaction analyzer (WPIA). By a series of self-consistent simulations, we revealed the conditions required for efficient particle acceleration by nonlinear effects in the generation process of whistler-mode chorus emissions. We also revealed the process of 'anomalous trapping', in which almost all of the low pitch angle electrons are trapped by coherent whistler-mode waves and scattered away from the loss cone. We developed a calibration method that accurately satisfies the continuity of the wave phase of the waveform measured by instruments onboard a spacecraft, which is crucial for the WPIA. We applied the WPIA to the MMS spacecraft measurements of whistler-mode waves and keV electrons to detect the energy transfer through wave-particle interaction.
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