DC Field | Value | Language |
---|---|---|
dc.contributor.advisor | Choi, Duk-In | - |
dc.contributor.advisor | 최덕인 | - |
dc.contributor.author | Baek, Seok-Chul | - |
dc.contributor.author | 백석철 | - |
dc.date.accessioned | 2011-12-14T07:26:34Z | - |
dc.date.available | 2011-12-14T07:26:34Z | - |
dc.date.issued | 1995 | - |
dc.identifier.uri | http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=101829&flag=dissertation | - |
dc.identifier.uri | http://hdl.handle.net/10203/47513 | - |
dc.description | 학위논문(박사) - 한국과학기술원 : 물리학과, 1995.8, [ vi, 70 p. ] | - |
dc.description.abstract | The effect of a $B_y$ field on ions in {\it unbounded transient orbits} in the current sheet of the geomagnetic tail are studied. The trajectories and the energization of ions injected at the north edge of the current sheet (z=+L) are investigated varying the dawn to dusk magnetic field strength $B_y$. The current sheet with $+B_y$ produces less energetic ions than that with $-B_y$. At $B_y=0$, the exit positions of ions after acceleration from the current sheet are scattered almost equally above and below the current sheet. A finite $B_y$ breaks this symmetry. The non-zero $E_yB_y$ produces $E_\|=E_yB_y/B$. The finite $E_\|$ makes the electrons move so as to create a cancelling electrostatic potential difference along the magnetic field line. Based on this fact, we estimate the self-consistent electrostatic field. In addition, we have calculated the distribution functions generated from the modified Harris type geomagnetotail with a dawn-dusk magnetic field ($B_y$) using the Liouvilles`` theorem. To find time-dependent z = 0 distribution functions, we start with two distribution functions at t = 0, the inner (z = 0) and the outer ($|z| > 4δ$). When a trajectory arrives at a phase space location at $z = 0$, the inner region distribution function is replaced by the outer region distribution function. From those simulations, we have seen the fact that $B_y$ fields ($1~3nT$) comparable to $B_z$ makes the anisotropic distribution isotropic and that as $B_y$ field increases and reaches 4~$6nT$, new anisotropic distribution functions and temperatures ($T_y ≥ T_x > T_z$) appear. But they are caused, not by the effect of resonance energies ($\hat{H} = 6.0$ and $\hat{H} = 50.8$), but by $B_n\hat{e}_z + B_y\hat{e}_y$. | eng |
dc.language | eng | - |
dc.publisher | 한국과학기술원 | - |
dc.subject | Geo-Physics | - |
dc.subject | Hamiltonian Chaos | - |
dc.subject | 우주플라즈마 | - |
dc.subject | 비선형동력학 | - |
dc.subject | 지구물리 | - |
dc.subject | 해밀턴 카오스 | - |
dc.subject | Space Plasma | - |
dc.subject | Nonlinear Dynamics | - |
dc.title | Nonlinear dynamics of ions in the current sheet of geomagnetotail | - |
dc.title.alternative | 지구자기꼬리 내에 존재하는 이온들에 관한 비선형 동력학 연구 | - |
dc.type | Thesis(Ph.D) | - |
dc.identifier.CNRN | 101829/325007 | - |
dc.description.department | 한국과학기술원 : 물리학과, | - |
dc.identifier.uid | 000835176 | - |
dc.contributor.localauthor | Baek, Seok-Chul | - |
dc.contributor.localauthor | 백석철 | - |
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