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一、行星性指数K和A 行星性指数表示地磁活动的一般状态,该指数是从位于中纬度地区(这是为了减少电急流的影响)经过挑选的一些地磁台计算出来的,并作为其余几十个地磁台的标准。但是,和所有的指数一样,由于地磁台的分布不够适当和外源场高度不规则,使行星性指数也蒙受其损害。例如,在某些情况下,极区亚暴对于所挑选的地磁台的磁照图是没有影响的,而在另一些情况下,也许由于极区电急流的赤道迁移,使得极区亚暴对磁照图也有很大的影响。实际上,行星性指数表示了许多外源场的扰动变化的混合效应,该指数对于地磁现象的相关研究是很有用的。
I. Planetary indices K and A Planetary indices represent the general state of geomagnetic activity calculated from a selection of geomagnetic stations located in the mid-latitude region (this is to reduce the effects of electrical rapids) and are calculated as the remaining Ten magnetic station standards. However, as with all indices, planetary indices suffer as well due to inadequate distribution of geomagnetic stations and irregularities in the exogenous field. For example, in some cases, polar sub-storms have no effect on the magnetic map of the selected geomagnetic station, while in other cases, the polar sub-storms may be reversed due to the equatorial migration of the polar eruptive jet Magnetic maps also have a big impact. In fact, the planetary index expresses the mixing effect of the perturbations of many exogenous fields, which is useful for the study of geomagnetic phenomena.