Effects of nondipole components on auroral zone configurations during weak dipole field epochs
Effects of nondipole components on auroral zone configurations during weak dipole field epochs
复制标题
弱偶极场时期非偶极分量对极光带结构的影响
DOI：
10.1029/jb085ib07p03549
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发表时间：
1980
影响因子：
--
通讯作者：
D. Sibeck
中科院分区：
文献类型：
--
作者：
G. Siscoe;D. Sibeck
古地磁研究表明，现今和历史上的非偶极磁场在某些方面是古地磁场非偶极分量的典型代表。我们应用这一原则的极光区在减少偶极场强度的时代的全球分布的调查。极光带的极向边界沿着沿着磁力线映射到偶极项占主导地位的非偶极项的距离，即使减少到目前的偶极强度的10%。因此，描述与太阳风相互作用的偶极标度关系可以用来绘制出当偶极强度降低而非偶极项保持不变时出现的极边界的轮廓。结果表明，非偶极项产生延长的极光带，延伸到明显较低的纬度比达到时，忽略非偶极项。
Paleomagnetic studies indicate that the present and historical nondipolar fields are typical in some respects to the nondipolar component of the paleofield generally. We apply this principle to the investigation of the global distribution of the auroral zones during epochs of reduced dipole field strength. The poleward borders of the auroral zones map out along field lines to a distance where the dipolar term dominates the nondipolar terms even for reductions to 10% of the present dipole strength. Thus the dipole scaling relations that describe the interaction with the solar wind can be used to map out the contour of the polar borders that occur when the dipole strength is reduced while the nondipolar terms are held fixed. The results show that the nondipolar terms produce elongated auroral zones that extend to appreciably lower latitudes than are reached when the nondipolar terms are ignored.