地磁半年变化不是高估，也不是系统性日半球不对称的一种解释
Geomagnetic Semiannual Variation Is Not Overestimated and Is Not an Artifact of Systematic Solar Hemispheric Asymmetry
摘要：
Mursula等人[2011年]（MTL11）认为，太阳风活动存在22年的变化，再加上一年中地球日面纬度的变化，导致在几个太阳周期中获得的平均地磁活动出现明显的半年变化。他们的结论是，观测到的半年变化被严重高估，很大程度上是这种推断的22年变化的人工制品。我们展示：（1）地磁活动或太阳驱动力不存在随太阳极场极性而变化的系统性交替年变化，（2）地磁活动的世界时变化始终具有二分假说的特征印记，而不是MTL 11建议所要求的轴向假说的特征印记，（3）半年变化不是人为因素，没有被高估，也不需要修正。
英文摘要：
Mursula et al. [2011] (MTL11) suggest that there is a 22-year variation in solar wind activity that coupled with the variation in heliographic latitude of the Earth during the year, gives rise to an apparent semiannual variation of geomagnetic activity in averages obtained over several solar cycles. They conclude that the observed semiannual variation is seriously overestimated and is largely an artifact of this inferred 22-year variation. We show: (1) that there is no systematically alternating annual variation of geomagnetic activity or of the solar driver, changing with the polarity of the solar polar fields, (2) that the universal time variation of geomagnetic activity at all times have the characteristic imprint of the equinoctial hypothesis rather than that of the axial hypothesis required by the suggestion of MTL11, and (3) that the semiannual variation is not an artifact, is not overestimated, and does not need revision.
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