论文标题
主要地磁领域的世俗变化的30年期
Thirty-Year Period in Secular Variation of the Main Geomagnetic Field
论文作者
论文摘要
在1900年至2000年的百年纪念期间，全球平均未签名的主要地磁场的年度率经历了三集的变化。最高年率分别发生在1910 - 1920年，1940- 1950年和1970 - 1980年左右，显示了30年的时间。此外，每个发作的上升阶段比阶段的下降要短得多。该周期性变化的控制因子是非偶极场，而不是偶极场，尽管与偶极子有关的磁能的世俗变化在所有其他倍数上都是主导的。
During the centennial period from 1900 to 2000, the globally averaged unsigned annual rate of the main geomagnetic field experienced a three-episode variation. The maximum annual rates occurred respectively around 1910-1920, 1940-1950, and 1970-1980, showing a 30-year period. In addition, the rising phase in each episode is much shorter than declining phase. The governing factor of this periodic variation is non-dipole field, instead of the dipole field, although the secular variation of the magnetic energy concerned with the dipole is dominative over all other multiples.
