We study the recovery characteristics of large-amplitude cosmic-ray decreases by utilizing the ground based neutron monitor observations. We divide large-amplitude cosmic-ray transient decreases (called Forbush decreases) in the galactic cosmic-ray intensity into different groups based on their decrease time and recovery time. We apply an exponential fit to the recovery profile of Forbush decreases after obtaining the average profile for different groups using superposed epoch analysis. After a similar superposed epoch analysis of the three selected interplanetary plasma and interplanetary magnetic field parameters, we apply exponential fit on the decay time profile of these parameters, during recovery the of Forbush decreases. We compare the characteristics of interplanetary plasma and field parameters with the characteristics of Forbush decreases during its recovery phase. We isolate the interplanetary plasma field parameters whose characteristic decay time best-fits the characteristic recovery time of Forbush decrease. Our results suggest that the decay rate of the solar wind plasma speed is best related to the recovery rate of the Forbush decrease.

我们利用地基中子监测观测研究了大振幅宇宙射线衰减的恢复特性。我们根据它们的减少时间和恢复时间将银河宇宙射线强度中的大振幅宇宙射线瞬态衰减（称为福布什衰减）分为不同的组。在使用叠加历元分析获得不同组的平均曲线后，我们将指数拟合应用于 Forbush 下降的恢复曲线。在对三个选定的行星际等离子体和行星际磁场参数进行类似的叠加历元分析后，我们对这些参数的衰减时间曲线应用指数拟合，在恢复期间 Forbush 的衰减时间减小。我们将行星际等离子体和场参数的特征与 Forbush 在恢复阶段下降的特征进行了比较。我们隔离了行星际等离子体场参数，其特征衰减时间最适合福布什衰减的特征恢复时间。我们的结果表明，太阳风等离子体速度的衰减率与 Forbush 下降的恢复率最相关。