论文标题
在偶数和奇数太阳能循环中的地磁指数SC17-SC24的比较：地磁活动中Gnevyshev差距的签名
Comparison of geomagnetic indices during even and odd solar cycles SC17-SC24: Signatures of Gnevyshev gap in geomagnetic activity
论文作者
论文摘要
我们表明，在循环的上升和下降阶段之间，黑子群区域的时间序列具有差距，即所谓的gnevyshev差距（GG），尤其是对于偶数编号的循环。对于奇数循环，此间隙不太明显，并且在最大周期后仅下降了。我们将周期重新采样为3945天（约10.8岁），并表明该循环开始后的1445-1567天，均匀周期的偶数周期开始，有时延长至周期开始后的1725天。对于奇数循环，差距早于循环开始后的1332-1445天，没有扩展。我们使用DST索引，相关的DXT-和DCX-Indices以及AP索引分析了太阳循环17-24的地磁干扰。在所有这些时间序列中，当时或之后的太阳指数中的GG有所下降，并且在偶数周期中，在1567-1725天之间，在奇数周期之间，在1445-1567天之间是最深的。在1445-1725间隔中，这些指数的平均值分别为46％，46％，18％和29％的平均值，而DST，DXT，DCX，DCX和AP的周围间隔分别为相似的间隔。对于奇数周期，DST和DXT-INDICES的平均值在1322-1567天之间的平均值比周围的间隔小31％和12％，但对于DCX索引而言，AP-INDEX的平均值不小于周围的间隔，而对于AP-INDEX，则只有4％。 DST-INDEX的偶数和奇数周期以及DXT-，DCX-和AP-INDICES的偶数循环的下降均在99％的水平上显着。对于DXT索引的奇数循环，显着性为95％，但对于DCX和AP-Indices的奇数循环的下降并不重要。
We show that the time series of sunspot-group areas has a gap, the so-called Gnevyshev gap (GG), between ascending and descending phases of the cycle and especially so for the even-numbered cycles. For the odd cycles this gap is less obvious, and is only a small decline after the maximum of the cycle. We resample the cycles to have the same length of 3945 days (about 10.8 years), and show that the decline is between 1445-1567 days after the start of the cycle for the even cycles, and extending sometimes until 1725 days from the start of the cycle. For the odd cycles the gap is a little earlier, 1332-1445 days after the start of the cycles with no extension. We analyze geomagnetic disturbances for Solar Cycles 17-24 using the Dst-index, the related Dxt- and Dcx-indices, and the Ap-index. In all of these time series there is a decline at the time, or somewhat after, the GG in the solar indices, and it is as deepest between 1567-1725 days for the even cycles and between 1445-1567 days for the odd cycles. The averages of these indices for even cycles in the interval 1445-1725 are 46%, 46%, 18%, and 29% smaller compared to surrounding intervals of similar length for Dst, Dxt, Dcx, and Ap, respectively. For odd cycles the averages of the Dst- and Dxt-indices between 1322-1567 days are 31% and 12% smaller than the surrounding intervals, but not smaller for the Dcx-index and only 4% smaller for the Ap-index. The declines are significant at the 99% level for both even and odd cycles of the Dst-index and for Dxt-, Dcx- and Ap-indices for even cycles. For odd cycles of the Dxt-index the significance is 95%, but the decline is insignificant for odd cycles of the Dcx- and Ap-indices.
