2009 Fiscal Year Final Research Report
Theoretical study on parametric instabilities of Alfven waves : Toward an explication of the solar wind MHD turbulence
| Project/Area Number |
20840042
|
|---|
| Research Category |
Grant-in-Aid for Young Scientists (Start-up)
|
| Allocation Type | Single-year Grants |
|---|
| Research Field |
Space and upper atmospheric physics
|
|---|
| Research Institution | Kochi National College of Technology |
|---|
Principal Investigator |
NARIYUKI Yasuhiro Kochi National College of Technology, 電気情報工学科, 助教 (50510294)
|
|---|
| Project Period (FY) |
2008 – 2009
|
| Keywords | 太陽風 / 惑星間空間 / プラズマ波動 / アルフェン波 / パラメトリック不安定性 |
|---|
| Research Abstract |
Parametric instabilities of solar wind Alfven waves are theoretically and numerically studied. The following represent the main results of this study : (i) Important characteristics in the solar wind MHD turbulence are naturally reproduced by nonlinear evolution of Alfvenic turbulence with more realistic power spectrum. (ii) Even if a decay instability is dominant at the linear stage, the parent wave can mainly be dissipated by the modulational instability at the nonlinear stage, due to time evolution of the proton velocity distribution functions.
|
