日冕的电离气体（又叫等离子体）不仅非常炙热，而且异常稀薄，其密度还不到组成太阳主体的氢气密度的十亿分之一。
As well as being very hot, the ionised gas of the corona (called plasma) has a superthin consistency. It is less than a billionth of the density of the hydrogen that makes up the main ball of the Sun.
最重要的一点是在电离层的电子和其他带电粒子的密度是波动的。
One of the most important of these is a fluctuation in the density of electrons and other electrically-charged particles in the ionosphere.
热辐射密度以核爆点距离平方倒数的速度衰减，爆炸、冲击波、致电离辐射效应的衰减速度则更快。
The intensity of thermal radiation decreases only as the inverse square of the distance from a nuclear detonation, while blast, shock, and prompt ionizing radiation effects decrease more rapidly.
超过此密度后，微波场在表面快速衰减，气体电离主要在表面进行。
Above this density, microwave field will damp rapidly, so the gas ionization is mainly on the surface.
通过仔细的理论分析，可以推导出如气体密度、温度和压力等各种物理参量，以及紫外辐射和电离辐射的流量。
With a careful theoretical analysis various physical parameters such as the gas density, temperature, and pressure, and the ultraviolet and ionizing radiation fluxes can be derived .
结果表明，在电离的初始阶段，电子、离子密度分布与场分布同步。
The results show that the density distribution of ion and electron is similar to electric field distribution.
理论计算与实验表明，双预电离在提高主电极间初始电子密度方面存在着明显的优越性。
Thetheoretical calculations and the experiments suggest that, double pre-ionization has an obvious advantage for increasing the initial electron density between the main electrodes.
继而从发电机理论得到了电离层电位及层电流密度在北半球的分布和变化。
Furthermore the distribution and variation of the electrostatic potential and layer ionospheric current density at the northern hemisphere are calculated by the dynamo theory.
本文就是为空间电离层环境模拟器研制的扩散型极低气压、低电子温度和极低密度的紧凑型电子回旋共振等离子体源的研制。
A compact ECR plasma source, the strengths of which are its ultra low electron temperature, its low pressure and its ultra low density, was developed and built for such a simulator.
本文首先实验测定了7 - ACA结晶热力学数据和粘度、密度、电离平衡常数等必要的基本物性数据。
First, the crystallization thermodynamic data and other basic physicochemical data of solution, such as viscosity, density of 7-aca solution and dissociation constants, were measured by experiments.
利用该装置测量了一氧化碳分子的光电离效率曲线及其离子碎片的部分光学振子强度密度。
The photoionization efficiency curve and the partial optical oscillator strength densities for different fragments of CO was determined by this work.
推导了三步光电离的场方程组和原子布居的密度矩阵方程组。
The equation of three step photoionization for describing the field and the density matrix as well as the atomic population was derived.
考虑等离子体中存在电离和复合这两种互逆过程及扩散和压力不均匀引起的等离子体流动，建立密度动力学方程。
A dynamic equation of plasma density is constructed about ionization, recombination, diffusion and plasma flow which is produced by inhomogeneous pressure.
从该电子密度模式和电离层波传播特性出发确定多径分量，计算短波信道相干带宽。
The coherence bandwidth of shortwave channel is calculated by using the density profile and wave propagation features in ionosphere.
水中放电等离子体(PPDW)具有高压、高密度和低温、低电离度的特点，人们对其辐射是否具有黑体辐射的特点一直观点不一。
Plasma in a pulsed discharge in water (PPDW) has the character of high pressure, high density and low temperature, low ionized degree.
离子密度随高度的解析展开是电离层物理模式参数研究中的一个关键技术。
The altitude semi-analytic expansion of ion densities is a key problem in parameterization of physical ionospheric models.
继而从发电机理论得到了电离层电位及层电流密度在北半球的分布和变化。
Furthermore, the distribution and variation of the electrostatic potential and layer ionospheric current density at the Northern Hemisphere are calculated by the dynamo theory.
地面入射的大功率无线电波能加热电离层等离子体，引起电离层电子温度和密度的扰动，实现电离层的地面人工变态。
The terrestrial ionospheric plasma can be heated by a powerful ground-based high-frequency radio wave, which results in the disturbance of the electron temperature and density.
电离层反射电波的能力取决于不同高度上电子密度的正常差别。
The ability of the ionosphere to reflect these waves is dependent upon normal variations in the electron density at different levels.
电离层对电磁脉冲传播的影响可以用一个频域的电流密度来描述，在时域则等效为一附加的电流密度和电导率。
Additional current density, which is a function of frequency, can be used to describe the effect of the ionosphere in the process of electromagnetic pulse propagation.
这些公式把多普勒频移与电离层及不均匀团块的电子密度变化、层和团块的运动速度以及地球磁场强度变化等参数直接联系起来。
By using the formulas, the Doppler shifts are related to the variation of electron density of both the ionosphere and the inhomogeneous mass, to the moving velocity of the layer a...
提出了利用GPS观测数据获得时变三维电离层电子密度分布的一种CT反演算法。
In this paper a ct algorithm of recovering time-dependent 3-d ionospheric electron density distributions by using GPS observations is suggested.
提出了利用GPS观测数据获得时变三维电离层电子密度分布的一种CT反演算法。
In this paper a ct algorithm of recovering time-dependent 3-d ionospheric electron density distributions by using GPS observations is suggested.
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