| Budget Amount *help |
¥5,070,000 (Direct Cost: ¥3,900,000、Indirect Cost: ¥1,170,000)
Fiscal Year 2015: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2014: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2013: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
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| Outline of Final Research Achievements |
Full particle-in-cell simulations, known as a first principle simulation method of collisionless plasmas, are used to reproduce the heliospheric termination shock and to examine micro- to meso-scale structures of the shock transition region and their effects on particle acceleration processes.
In terms of ion acceleration, shock surfing acceleration (SSA) model had been a most plausible model as the mechanism of initial acceleration of anomalous cosmic rays which were believed to be accelerated at the termination shock. This study revealed that the SSA does not work if the presence of right amount of pickup ions are taken into account. Instead, it was shown that shock drift acceleration is a more plausible mechanism. Electron acceleration at the termination shock, on the other hand, had not been strenuously discussed. Here, it was demonstrated that wave-particle interactions through the multi-scale structures in the transition region result in locally producing non-thermal electrons.
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