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Study on the data analysis of lunar ad planetary magnetic anomalies

月球AD行星磁异常数据分析研究

基本信息

批准号：
11640409
负责人：
TSUNAKAWA Hideo
金额：
$ 1.09万
依托单位：
Tokyo Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

1) Spatial resolution of ER methodThe electron reflection (ER) method is thought to be one of the useful techniques for detecting the surface magnetic anomaly. We examined its spatial resolution from the observational data and the theoretical aspect. Using the 16Hz data of GEOTAIL magnetometer, the directional stability for about 500 seconds in both the solar-wind and magnetoshpere region was analyzed. As a result, the fisherian standard deviation is less than 2 degree in the tail-lobe region and 4 degree in the calm interval of the solar-wind region. However it is much higher in other region to be 15-30 degree. These directional scattering exceeds the normal Larmor raius of electrons. If we apply 16Hz sampling rate, the foot print of ER remote sensing is continuous enough for a high spatial resolution of about 1km.2) Magnetic fields along the moon orbitWe analyzed the directional stability of 20-100 Re orbit by GEOTAIL 3min-averaged data (1994 July 1-August 13 ; 44days). The histogram of fisherian standard deviations (a63) shows almost bimodal feature with peaks around 10-20 degree and 40-50 degree. The results from the 16Hz-data analyses suggest that the foot print is continuous when a63<40 degree. Therefore, at least, one third of the lunar orbit could provide an enough condition of the lunar magnetic environment for the 16Hz ER method.3) Calibration of magnetometer alignmentWe show that magnetometer alignment can be calibrated by using the Alfven wave of the solar wind for not only a spinning space craft but also tri-axial controlled one.

1)电子反射（ER）法被认为是探测地表磁异常的有效方法之一。我们从观测数据和理论两个方面考察了它的空间分辨率。利用GEOTAIL地磁仪16 Hz的观测数据，分析了太阳风区和磁层区500秒左右的方向稳定性。结果表明，在尾瓣区的欧拉标准差小于2度，在太阳风区的平静区间小于4度。然而，在其他地区要高得多，为15-30度。这些定向散射超过了电子的正常拉莫尔半径。2）月球轨道磁场沿着分布利用GEOTAIL卫星1994年7月1日至8月13日的3 min平均数据（44天），分析了20-100 Re轨道的方向稳定性。高斯标准差（a63）的直方图显示几乎双峰特征，峰值在10-20度和40-50度附近。从16 Hz数据分析的结果表明，足迹是连续的，当a63<40度。因此，至少有1/3的月球轨道可以为16 Hz ER方法提供足够的月球磁环境条件。3）磁强计校准我们表明，利用太阳风的阿尔芬波，磁强计校准不仅可以用于旋转航天器，而且可以用于三轴控制的航天器。