磁层顶位置的卫星观测

本文用了自1963年到1979年卫星穿越磁层顶的1024个观测资料计算了向阳侧磁层顶椭球面的参数。企图从这些资料得出星际磁场和太阳风热压强对向阳侧磁层顶位置和形状的影响大小。但数值计算和理论分析都表明,目前所具有的观测资料的精度不足以获得星际磁场和太阳风热压强影响的数值。本文分析了各种因素所造成的在计算该椭球面参数时的不确定性。进而提出了对进一步工作的建议。该椭球面的平均大小、形状和方位的观测值与理论预计值是非常一致的。 

THE SPACECRAFT OBSERVATIONS OF THE POSITION OF MAGNETOPAUSE

1024 magnetopause crossing data from 1963 to 1979 are used to calculate the ellipsoid of the dayside magnetopause surface.An attempt is made to search for the effects of the interplanetary magnetic field and solar wind thermal pressure on the position and shape of the dayside magnetopause.The uncertainties in the determination of the parameters of the ellipsoid from various sources are analyzed.Both numerical results and theoretical analyses show that the accuracy of the data available is not adequate enough to see the effects.Some suggestions are proposed for further work.Observations of the average values of the size,shape and orientation of the dayside magnetopause agree quite well with the theoretical prediction.