Dynamics Explorer-1 and -2 Magnetometer Data Analysis and Establishment of a Connection to SPAN (Space Physics Analysis Network)

第一年，围绕M-VAX II小型计算机建立的动力学探索者（DE）数据分析系统被建造。这台计算机的网络连接到SPAN进行了探索，并在1986年建立了临时连接。1987年正式建立了一个SPAN节点，为日本和美国之间的快速通信和数据交换开辟了一条道路。通过这种方式，大量的DE数据已经从NASA和其他机构转移到我们的实验室。大部分磁力计数据的传输是通过使用常规磁带或盒式磁带完成的。磁力仪数据的传输和数据库建设进展顺利。1988年安装了由美国航天局提供的光盘设备。在软件开发方面投入了相当大的努力。利用这样构建的数据分析系统，已经进行了全面的数据分析和理论研究，并将继续加快步伐。迄今为止进行的研究包括：（a）比较从DE-1和DE-2磁力计在航天器几乎处于同一磁通量管时进行的观测中推断出的高空和低空场向电流;（B）比较从DE-2磁场和电场观测中推断出的电离层Pedersen电导率与标准电离层模型的估计值;（c）根据DE-2观测区分磁层起源的场向电流和电离层起源的场向电流;（d）研究向阳面尖区的场向电流和电子沉淀，特别是与行星际磁场条件的关系。DE数据分析在教育和研究中发挥了重要作用，通过研究生和本科生的积极参与，产生了五篇科学硕士论文。

The Dynamics Explorer (DE) data analysis system built around a M-VAX II minicomputer was constructed during the first year. A network connection of this computer to SPAN was explored, and a temporary connection was made in 1986. A SPAN node was officially established in 1987, opening a way for rapid communication and data exchange between Japan and U.S.A. By this means considerable quantities of DE data have been transferred to our laboratory from NASA and other institutions. The transfer of the bulk of magnetometer data has been accomplished by using conventional or cassette magnetic tapes. The transfer of the magnetometer data and the construction of database have been proceeding smoothly. An optical disc equipment provided by NASA was installed in 1988. A considerable effort has been devoted to the development of software. Using the data analysis system so constructed, comprehensive analyses of data and theroretical investigations have been conducted and will be continued with an accelerated pace. The studies conducted thus far include: (a) a comparison of field-aligned currents at high and low altitudes as deduced from the DE-1 and -2 magnetometer observations made when the spacecraft were nearly in the same magnetic flux tube; (b) a comparison of the ionospheric Pedersen conductivity deduced from the DE-2 magnetic and electric field observations with estimates from a standard ionospheric model; (c) distinction of field-aligned currents of magnetospheric origin from those of ionosheric origin on the basis of DE-2 observations; (d) an investigation of field-aligned currents and electron precipitation in the dayside cusp region , in particular, in relation to interplanetary magnetic field conditions. The DE data analysis has played a significant role in education as well as in research through an active participation by graduate and undergraduate students, resulting in five Master of science theses.