Abstract—

Characteristics of changes in the solar activity indices (the flux of the solar radio emission at a wavelength of 10.7 cm F and the new version of the relative sunspot number Ri) and the ionospheric index of this activity T in the 23rd and 24th solar cycles, which were low by the amplitude of solar and geomagnetic activity, are analyzed. The running mean over 12 months and smoothed (by a 24-month filter) values of these indices are considered in the analysis. It is found that the relation between the T and F indices was on average stable for these cycles and did not differ from the previous solar cycles. The relation between the T and Ri indices changed with time in the 23rd and 24th cycles and was different from the previous cycles. Moreover, a distinct hysteresis effect in the dependence of the smoothed values of T on Ri was observed in the 24th cycle when different values of T corresponded to a fixed value of Ri in the growing and declining phases of the solar cycle. This effect was absent in the dependence of T on F. Thus, it is confirmed that the F index is a more exact indicator of solar activity for the ionosphere than Ri.

中文翻译：

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第23和第24个周期中电离层参数的太阳活动指标

摘要—

在第23和第24个太阳周期中，太阳活动指数（波长为10.7 cm F的太阳无线电辐射通量和新版本的相对太阳黑子数Ri）的变化特征以及该活动的电离层指数T分析了由于太阳和地磁活动的幅度而变低的情况。分析中考虑了12个月的运行平均值和这些指标的平滑值（通过24个月的筛选器）。发现在这些周期中，T和F指数之间的关系平均稳定，与先前的太阳周期没有差异。T和Ri之间的关系索引在第23和24个周期中随时间变化，并且与以前的周期不同。此外，在太阳周期的生长和下降阶段，当T的不同值对应于Ri的固定值时，在第24个周期中观察到了T的平滑值对Ri的依赖性的明显滞后效应。T对F的依赖性不存在这种影响。因此，可以证实，˚F指数是太阳活动对电离层比更精确的指示器日。