第二章靜電模型PPT課件

1、第二章第二章 靜電模型靜電模型第三節(jié)第三節(jié) 粒子移動格式的精度粒子移動格式的精度 假定有一簡諧運(yùn)動假定有一簡諧運(yùn)動20d xxd t 其解為其解為00000( , )( )cos( )sinx t tA ttB tt對有限差分蛙跳格式對有限差分蛙跳格式2022ttttttxxxxt 0sin22tt ittxAe假定假定則有則有可得可得001212tt0時,時, 為復(fù)數(shù) 第四節(jié) 網(wǎng)格-粒子云-蛙跳動力論 共振因子共振因子1() ,gglnl nl k vkv為空間網(wǎng)格效應(yīng),n為時間離散效應(yīng) Electrostatic Solitary Structures in 2D plasmaThe ob

2、servations of the Fast satelliteErgun et al., GRL, 1998.Characteristics：1. The structures have a positive potential signature. 2. The parallel slicing of parallel electric field has bipolar structures. 4. The parallel slicing of perpendicular electric field has unipolar structure.5. Debye-scale size

3、 in the parallel direction.The stacked profiles of the electric fields from The electric field and phase-space diagram of electrons from Multi-dimensional structureFrom Chen, GRL, 2003 2D PIC simulations/0.5epe 2040608010012050100150200250XY-0.800-0.600-0.400-0.20000.2000.4000.6000.800Expet=40204060

4、8010012050100150200250XY-0.360-0.270-0.180-0.09000.0900.1800.2700.360Ey2040608010012050100150200250XY-0.700-0.525-0.350-0.17500.1750.3500.5250.700pet=120Ex2040608010012050100150200250XY-0.350-0.262-0.175-0.08700.0870.1750.2620.350Ey 2040608010012050100150200250XY-0.300-0.225-0.150-0.07500.0750.1500.

5、2250.300pet=820Ex2040608010012050100150200250XY-0.120-0.087-0.055-0.0220.0100.0430.0750.1080.140Ey2040608010012050100150200250XY-0.250-0.188-0.125-0.06300.0630.1250.1880.250pet=2000Ex2040608010012050100150200250XY-0.120-0.090-0.060-0.03000.0300.0600.0900.120 2D PIC simulations/2epe 04590135180X-0.25

6、0-0.188-0.125-0.06300.0630.1250.1880.250-0.500-0.375-0.250-0.12500.1250.2500.3750.500(c) pet=194004590135180X-0.420-0.315-0.210-0.10500.1050.2100.3150.420-0.630-0.473-0.315-0.15800.1580.3150.4730.630b) pet=9000459013518004590135180XY-0.700-0.525-0.350-0.17500.1750.3500.5250.70004590135180Y-1.00-0.75-0.50-0.2500.250.500.751.00(a) pet=100 -0.50-0.250.000.250.50 Ex(a) Y=71.4D04590135180 X (b) Y=84.1D04590135180-0.4-0.20.00.20.4 EyX