| Date |
Author + Title |
Description |
| 2003/01/17 |
D. Koga, Time series analysis with intermittent data
. |
Review of Kovacs et.al.2001, Probability density, structure function analysis, wavelet transform and filtering are carried out in order to separate the intermittent parts of data from noise-like background. |
| 2003/01/24 |
M. Ohnishi, Super critical perpendicular shock
. |
Review of M. Terada and S. Machida(1999), Super critucal shock, including alpha particle, non-stationary of shock structure. |
| 2003/01/30 |
S. Matsukiyo(Max-Plank Institute.), High frequency wave in the foot of quasi-perpendicular collisionless shock
. |
At quasi-perpendicular, super-critical shock geometry, trapping of electrons is observed in normal direction to wave propagation axis,
performing 1-d PIC simulations. EM modified two stream instability contribute to the trapping of electrons. |
| 2003/01/30 |
M. Oka(Tokyo Univ.), Interstellar helium pickup ions
. |
Statistical obsevation of a 'torus'-like velosity distribution of the helium pickup ions. These depend on local magnetic field direction and turbulence level.
Acceleration of interstellar helium pickup ions at the Earth's bow shock: Geotail observation |
| 2003/02/14 |
Master's thesis presentation practice.
. |
. |
| 2003/02/26 |
Master's thesis presentation
. |
- K.Kawamura, Jeans instability in dust plasma :effect of drift velocity
- T.Shiraishi, Non-linear time evolution of large amplitude relativistic Alfven waves
- M.Seki, The process of phase coherence in MHD turbulence: numerical simulation analysis
|
| 2003/04/17 |
M. Ikeda
. |
Our new lab member introduced his undergraduate research project: Form dependability of melting temperature of crystal particle |
| 2003/05/01 |
T. Hada,
Introduction to space plasma research
. |
- Space Plasma Physics: solar wind, aurora,magnetic reconnection, substorm, shock wave, cosmic rays, ....etc.
- Background: hydrodynamics, electromagnetics, chaos, plasma, relativity, non-linear wave, .... etc.
- Keyword: non-linear, non-equilibrium, non-stationary
|
| 2003/05/08 |
F. Otsuka, Parallel diffusion of charged particles: comparision with QLT |
Solar energetic mean free path estimated by resonant wave-particle intraction(Tsurutani et.al.2000) and time/intensity profiles with predictions of a Boltzmann eq.(Mason et.al.1989). parallel diffusion of charged particles compared with QLT by 1-d test particle simulations
|
| 2003/05/15 |
S. Yagi, Upstream MHD waves and their association with backstreaming ion |
Upstream MHD waves associated with refrected ion, intermediate ion, diffusion ion are observed by ISEE1 and 2 (M. Hoppe et.al.JGR1981)
Data analysis of shocklet (perpendicular wave amplitude, ellipticity etc.)
|
| 2003/05/22 |
Hada, Koga, Otsuka, Yagi
|
Practice session for SGEPSS Spring 2003. |
| 2003/05/26-29 |
SGEPSS meeting 2003, Tokyo
|
Spring annual meeting of the Society of Geomagnetism and Earth, Planetary and Space Sciences.
. |
| 2003/06/05 |
K. Arimatsu,
simulation of dust plasma |
Review of 'Simulation of dust plasmas near surfaces in space'(JGR N.A. Gatsonis et al.1994).
Method of Monte Carlo charging collisions.
Effect of dust particulates drift velocity relative to plasmas.
|
| 2003/06/12 |
D.Koga, Non-Gaussian statistics in space plasma turbulence (part1.)
|
q'th structure function and p.d.f. of magnetic field data in upstream and downstream of the bow shock(Dudok et al 1996, Nonlinear Processes in Geophysics).
. |
| 2003/06/26 |
D.Koga, Non-Gaussian statistics in space plasma turbulence (part2.)
|
probability density of observed magnetic field and structure function, isotropy; spatial distribution versus azimuth and elevation angle of some statistics (mean,variance,fractal dimension).
|
| 2003/07/03 |
M.Onishi, Numerical Scheme for the integration of Vlasov-Maxwell equations (part 1.)
|
dimensionless form of Vlasov-Maxwell system of eqs., splitting scheme (Hamiltonian can be split into particle energy, and then electrical potential and phase space flow for finite time step are approximately obtained.),Mangeney et al.2002 Journal of Computational Physics
|
| 2003/06/30-07/11 |
IUGG 2003 General Assembly, Sapporo, Japan
|
International Union of Geodesy and Geoshysics ⅩⅩⅢ General Assembly.
|
| 2003/07/17 |
M. Yagi, Statistical analysis of shocklet (for SGEPSS summer school)
. |
Introduction(foreshock region, shocklet), statistical analysis of observed shocklet for dependence on a propagation angle(deviation of envelope, ellipticity of polarized wave, wave length, winding number, dumping rate, isotropy), Numerical integration of DNLS eq.
|
| 2003/07/20-23 |
SGEPSS Summer School 2003
|
yagi's session, What is nonlinearity in space plasma?
|
| 2003/07/23 |
B. Lembege, Structure, formation and dynamics shock waves
. |
Basic lecture of collisionless shock, nonstationary and nonuniform of shock front, electron acceleration and trapping with front ripple.
|
| 2003/07/31-08/07 |
ICRC 2003, Tsukuba, Japan
|
ICRC 2003 The 28th International Cosmic Ray Conference, Tsukuba, Japan
|
| 2003/09/10-11 |
SGEPSS submeeting, Kasuga, Fukuoka
|
New perspective of space plasma waves.
|
| 2003/09/12 |
T. Nakamura
(Fukui pref. Univ.),
Relativistic Thermodynamics
|
Entropy is discribed by using four-vecor inverse temperature included relativistic bulk moment. Relativistic case of heat conduction equation.
|
| 2003/09/19 |
O. Saka (Kurume National College).
A slow mode wave as a cause of the primary acceleration of the aurora.
|
MHD model of primary acceleration of the aurora particles at magnetic equator. Energy dependence of injected plasmas.
|
| 2003/09/26 |
M. Oonishi
Numerical Scheme for the integration of Vlasov-Maxwell equations (part 2.)
|
3.2. Solution of the one dimensional advection equation, 3.3. discretization of displacement operator (discontinuous Galerkin methods.)
|
| 2003/10/03 |
K. Arimatsu,
simulation of dust plasma(part 2.) |
Simulation results. 1. Isolated dust particle, 2. dust cloud depending on dust plasma density, relative velocity to plasma flow, wall potential.
|
| 2003/10/09 |
M. Ikeda,
Synchronization of coupled salt-water oscillator |
Review of Miyakawa et.al.Physica D 2001
周りが水の水槽に、底に小さな穴がある3.5cm四方の塩水の入ったカップを複数個並べ、その個々の振動の様子
、振動のカップリングの様子を観察する。カップリングパラメータR（＝カップの表面積S1/外の水の表面積S0)が大きいほど、個々のカップの振動は一様に振動する。また、その周期は、引き込み現象により、カップ固有の振動周期より長くなる。
|
| 2003/10/16 |
T. Hada,
最近興味を持っていること、
近い将来かんがえてみたいこと。 |
多自由度系のふるまいと空間次元依存性、不安定性の競合過程、Shockletについて、Soliton theoryとその関連、ゆらぎの相関について、共鳴組多体系の自己組織化、アルフヴェン波の崩壊不安定性。
|
| 2003/10/23 |
D. Koga,
引き込み現象は何故起こるのか？/解析信号とヒルベルト変換
|
例として摩擦力が十分に大きい振り子を考える。強制振動の周期に関して離散化したサークルマップでは、固有な巻き数で周期的に回転する。振り子を引っ張る重力の効果が有意であると、真の巻き数が有理数となるような周期に引き込まる。
観測される信号を、複素平面上で時間的に変化する複素信号の実軸上への投影と考え、観測信号から'振幅の変化'と'位相の変化'を抽出する方法をヒルベルト変換を用い紹介。（参考文献:Phase synchronization:from theory to data analysis, Rosenblum et. al.2001）
|
| 2003/10/31-11/3 |
第113回SGEPSS秋学会, 富山大学
|
|
| 2003/11/6 |
F. Otsuka,
宇宙線拡散の歴史的背景（D論イントロ）
|
対流・拡散方程式、拡散的加速(Diffusive Shock Acceleration)と加速効率（途中）。
|
| 2003/11/12-14 |
応用力研研究集会, 春日, 福岡
|
非線形は動および非線形力学系の数理とその応用
|
| 2003/11/20 |
S. Yagi,
shockletとは？/wevelet変換とneural network
|
論文レビュー: P.Muret et.al.JGR 1995, 非線形波動の急峻化プロセスは、高周波を励起し、shockletとなる。フーリエ変換ではshockletの高周波成分を上手く抽出することができず、局所的な構造を抽出可能なwevelet変換が良い。ニューラルネットワークを用いたshockletの認識(認識の分類：急峻性、高周波の存在、形、並進変換不変性)。
|
| 2003/11/27 |
Dr. Grisha Vekstein (UMIST),
Signatures of the solar corronal heating by nanoflares
|
Introduction of solar coronal heating by magnetic reconnection. Reconnection events are observed as solar flares.
The occurrence rate of flares have an inverse power-law distribution with their energy.
The power-law spectrum index and time history of x-ray intensity are numerically discussed.
In detail, Plasma Phys. Control. Fusion 45(2003) 535-545
|
| 2003/12/03-05 |
応用力研研究集会, 春日, 福岡
|
|
| 2003/12/8-12 |
AGU meeting, San Francisco
|
|
| 2003/12/18 |
M. Oonishi,
Numerical Scheme for the integration of Vlasov-Maxwell equations (part 3.)
|
Property of discontinuous Galerkin methods,
detemination of expansion coefficient of any function in terms of the derivatives of the function.
|