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古地磁强度测定资料的复查表明,在过去的2000年内偶极矩有明显的减弱;以往2000年中热区的扩大也有了很好的证据。图1的现代资料展示了偶极矩的这种减弱。它表明,在二十世纪内,高斯系数g_1~0的减小与偶极矩 M 成正比:
The review of paleomagnetic data shows that the dipole moment has been significantly weakened in the past 2000 years, and evidence of the expansion of the hot zone in the past in the past is also well documented. The modern data in Figure 1 shows this dipole moment reduction. It shows that in the twentieth century the decrease of the Gaussian coefficient g_1 ~ 0 is proportional to the dipole moment M: