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首页> 外文期刊>Journal of Geophysical Research, A. Space Physics: JGR >Solar magnetic polarity dependency of geomagnetic storm seasonal occurrence
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Solar magnetic polarity dependency of geomagnetic storm seasonal occurrence

机译：太阳磁极地磁的依赖风暴季节出现

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摘要

For nearly a century it has been known that the tendency for geomagnetic activity is, on average, higher at the equinoxes than at the solstices. Previous studies on semiannual geomagnetic activity were performed mainly for geomagnetic indices such as am, aa, U, and AL. Thus, we need to understand the seasonal variation of geomagnetic activity defined by the Dst index over the long term. It is also necessary to test the solar magnetic polarity dependence of geomagnetic activity. This paper is a statistical analysis of the geomagnetic storms defined by the Dst index. Our storm data consists of two sets of storm data for 5 years at each solar minimum during the four solar cycles (19-22) from 1962 through 1998 for two of each solar magnetic polarity. The storms are divided into two groups defined by Dst index (Dst(min) 70 nT; Dst(min) 90 nT). Monthly occurrences of these storms are compared. Storms of |Dst| > 90 nT and of |Dst| > 70 nT occurred 153 and 238 times, respectively, during the testing periods.Storms occurred more frequently during the spring and fall seasons for all solar cycle minima, regardless of solar magnetic polarity.
机译：近一个世纪已经知道地磁活动的趋势,平均而言,在春分和秋分高于二至点。之前的研究在半年度地磁主要为地磁活动进行等指标,aa、U和。因此,我们所需要的理解的季节性变化Dst定义的地磁活动指数从长远来看。太阳磁极的依赖关系地磁活动。分析定义的地磁风暴Dst指数。在每个太阳风暴数据为5年在四个太阳周期(19 - 22日)在1962年到1998年有两个每个太阳的磁场极性。由Dst指数(Dst (min) 70 nT;出现这些风暴进行了比较。|等等的| > 90的nT和|等等| > 70新界发生分别为153和238倍测试时间。在春天和秋天季节太阳能周期最小值,不管太阳磁场极性。

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