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The Jovian magnetosphere is modulated by the solar wind and centrifugal force. The configuration of the magnetic field in the previous model of the magnetosphere including the centrifugal force is consistent with the observations at low magnetic latitude (Λ〈50°), while there is a substantial difference between the results of the model and the observations at high magnetic latitude (Λ≥50°), especially in the distant magnetotail. Based on the previous model, a new configuration of the Jovian magnetosphere in the night side is suggested by a three-step transformation in this study. The new magnetosphere obtained by the transformation method is flattened in the z-direction and stretched in the x-direction in distant magnetotail, which agree with general knowledge. 相似文献
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Phobos 2 plasma measurements have revealed solar wind deceleration of about 100 km/s upstream of the Martian bow shock. It is suggested that the deceleration is due to the mass loading by the ions originating from the hot oxygen corona of Mars. In this study, we use a gas-dynamic model to estimate the solar wind deceleration caused by the mass loading effect and the result shows that the deceleration is only about 10-15 km/s when we invoke the well established hot oxygen corona density profiles. 相似文献
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1太阳、地球与月球 我们的太阳系由太阳、8颗行星及其卫星、小行星、彗星以及大量尘埃、气体、等离子体、辐射粒子和电磁场构成,直径几乎达到11.y.(1.y.为光年,光走过一年的距离)[1-6]. 相似文献
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在地球上,可以通过对一个容器中的液体的密度或速度等的测绘,很容易对湍流进行研究.在空间中,我们预期在太阳风、星际空间和黑洞周围的吸激盘中会发生湍流.在时空中测量流体那么容易.现在由4个监测等离子体的卫星组成的集群(cluster)提供了首次对空间中湍流的权威性的研究结果. 相似文献
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Effect of change in large and fast solar wind dynamic pressure on geosynchronous magnetic field 下载免费PDF全文
We present a comparison of changes in large and sharp solar wind dynamic pressure,
observed by several spacecraft, with fast disturbances in the magnetospheric
magnetic field, measured by the geosynchronous satellites. More than 260 changes in
solar wind pressure during the period 1996--2003 are selected for this study. Large
statistics show that an increase (a decrease) in dynamic pressure always results in
an increase (a decrease) in the magnitude of geosynchronous magnetic field. The
amplitude of response to the geomagnetic field strongly depends on the location of
observer relative to the noon meridian, the value of pressure before disturbance,
and the change in amplitude of pressure. 相似文献
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在宇宙中的稀薄等离子体中,通常所见的两体库仑碰撞是不重要的。带电粒子的行为由长程电磁力引起的集体相互作用来控制.在这些等离子体中某些动力学能量被释放出来而转变为热能时,粒子的能量分布会极大地偏离麦克斯韦-玻尔兹曼分布.通过研究粒子的加速过程,我们可以详细地了解能量的转换过程及系统可能达到的极端条件. 天体物理向我们提供的最新的一个例子是发生在1987年初的超新星爆发(被命名为SN1987A).在这次超新星爆发中,人们接收到从射电到γ射线的全波段上电磁辐射的爆发,同时也观测到中微子爆.天体物理学家急切地希望直接或间接地… 相似文献
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一、物质的第四态--等离子体我们知道,物质通常处于三种聚集态,即固态、液态和气态,随着温度的变化,物质的三态之间可以互相转化。如果温度升高到104K甚至105K,分子间和原子间的运动十分剧烈,彼此间已难以束缚,原子中的电子因具有相当大的动能而摆脱原子核对它的束缚,成为自由电子,原子失去电子变成带正电的离子。这样,物质就变成了一团由电子和带正电的离子组成的混合物。发生了电离的气体,无论是部分电离还是完全电离,虽然描述普通气体的密度、温度、压强等仍适用,但它的主要性质已发生了本质的变化。在气体中电离成分只要超过1‰,它的行为就主要由电子和离子间的库仑力来支配。 相似文献