Laboratory simulation of plasma phenomena in comets
Laboratory simulation of plasma phenomena in comets
复制标题
彗星等离子体现象的实验室模拟
DOI：
10.1029/ja073i001p00259
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发表时间：
1968
影响因子：
--
通讯作者：
G. Kasai
中科院分区：
文献类型：
--
作者：
L. Danielsson;G. Kasai
描述了一个模拟太阳风和彗星之间相互作用的模型实验。目的是研究彗星大气中分子的电离和加速。真空隧道中的等离子体流（ne = 1013 cm−3，Te = 3 ev，Xe = 6 × 106 cm/sec）与从半径为1 cm的干冰核心升华的CO2气体云相互作用。冰层表面的气体密度为5 × 1013 cm−3。诊断方法包括图像转换器摄影和光谱学。这种相互作用的特点是无碰撞，在气流第一次撞击云后的10微秒内，产生了一个轮廓分明的尾部，长度为20 cm。一个可见的彗发在冰的前面延伸了大约3厘米。发现CO2气体基本上被离子化并随流沿着被拖曳。电离被认为是可以解释的方面增加的平均电子能量所造成的相互作用。离子上的阻力可能是由于与等离子体流的磁耦合。
A model experiment simulating the interaction between the solar wind and comets is described. The aim is to study the ionization and acceleration of molecules in the atmosphere of a comet. A plasma stream (ne = 1013 cm−3, Te = 3 ev, υ = 6 × 106 cm/sec) in a vacuum tunnel interacts with a cloud of CO2 gas sublimated from a dry ice core of 1-cm radius. The gas density at the surface of the ice is 5 × 1013 cm−3. Diagnostic methods include image converter photography and spectrography. The interaction, which is characterized as collisionless, gives rise to a well-defined tail developing to a length of 20 cm within 10 μsec after the first impact of the stream against the cloud. A visible coma extends about 3 cm in front of the ice. The CO2 gas is found to be substantially ionized and dragged along with the stream. The ionization is believed to be explainable in terms of an increased average electron energy caused by the interaction. The drag on the ions is probaly due to magnetic coupling to the plasma stream.