Plasma Morphology at Mars. Aspera-3 Observations

A total of about of 400 orbits during the first year of the ASPERA-3 operation onboard the Mars Express spacecraft were analyzed to obtain a statistical pattern of the main plasma domains in the Martian space environment. The environment is controlled by the direct interaction between the solar wind and the planetary exosphere/ionosphere which results in the formation of the magnetospheric cavity. Ionospheric plasma was traced by the characteristic “spectral lines” of photoelectrons that make it possible to detect an ionospheric component even far from the planet. Plasma of solar wind and planetary origin was distinguished by the ion mass spectrometry. Several different regions, namely, boundary layer/mantle, plasma sheet, region with ionospheric photoelectrons, ray-like structures near the wake boundary were identified. Upstream parameters like solar wind ram pressure and the direction of the interplanetary electric field were inferred as proxy from the Mars Global Surveyor magnetic field data at a reference point of the magnetic pile up region in the northern dayside hemisphere. It is shown that morphology and dynamics of the main plasma domains and their boundaries are governed by these factors as well as by local crustal magnetizations which add complexity and variability to the plasma and magnetic field environment.     

Solar activity and human health at middle and low geomagnetic latitudes in Central America

The study of the possible effect of solar variability on living organisms is one of the most controversial issues of present day science. It has been firstly and mainly carried on high latitudes, while at middle and low latitudes this study is rare. In the present review we focused on the work developed at middle and low geomagnetic latitudes of America. At these geomagnetic latitudes the groups consistently dedicated to this issue are mainly two, one in Cuba and the other in Mexico.     

灰色系统理论在测量不确定度评定中的应用

采用统计方法计算标准不确定度一般需要一定数量的测量数据且知道其统计分布规律,这在实际中很难做到。本文利用灰色系统理论给出求解标准差的新方法,以此来评定测量不确定度,对数据量和分布规律无特殊要求,在实际应用中取得较好效果。     

交变电场清除介电颗粒的作用

电帘除尘被认为是最有可能在深空探测中应用的除尘方法之一. 利用电动力学基本理论分析了平行电极清除颗粒的条件, 引入克服范德瓦尔斯力对颗粒运动影响的临界悬浮电压判据, 并获得了该除尘临界电压与交流电频率之间的关系. 理论计算和实验结果表明, 在频率较低和较高的情况下, 临界电压取决于不同的物理机制.