Abstract

The correlations between variations in the geomagnetic cutoff rigidity of cosmic rays and the Dst and Kp geomagnetic indices and solar-wind and IMF parameters are calculated for the three phases of the magnetic storm of November 20–21, 2003: before the storm and during its main and recovery phases. The correlations are the strongest between variations in the cutoff rigidity and the Dst index during all stages. A significant correlation was recorded with the By component of IMF and the field magnitude B; the correlation with By dominated during the main phase, and the correlation with B was dominant during the recovery phase. There is also a high correlation with the dynamic parameters of solar activity during the main phase, especially with the solar-wind speed. As far as we know, hysteresis phenomena have been discovered for the first time in the relationship between the cosmic-ray cutoff rigidities and the parameters of the helio- and magnetosphere on the scale of the magnetic storm (with Moscow station as an example). Loop-like patterns formed, because the trajectories of variations in the cutoff rigidities versus the studied parameters during storm intensification (development of current systems) did not coincide with the trajectories during the recovery phase (decay of current systems). The correlations of the cutoff rigidities with Dst and Kp indices were characterized by a narrow hysteresis loop, and their correlations with the IMF parameters were characterized by a wide hysteresis loop. The hysteresis loops for the relationship between the cutoff rigidities and solar-wind density and pressure were disordered.

中文翻译：

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2003年11月20日风暴不同阶段的宇宙线截止刚度和磁层参数动态

摘要

针对2003年11月20日至21日的磁暴的三个阶段，计算了宇宙射线的地磁截止刚度的变化与Dst和Kp地磁指数以及太阳风和IMF参数之间的相关性：主要阶段和恢复阶段。在所有阶段，截止刚度变化和Dst指数之间的相关性最强。与IMF的By分量和磁场强度B有显着的相关性; 在主要阶段与By的相关性以及与B的相关性在恢复阶段占主导地位。在主阶段，特别是与太阳风速也与太阳活动的动态参数高度相关。据我们所知，在磁暴尺度上，宇宙射线截止刚度与太阳和磁层参数之间的关系首次发现了磁滞现象（以莫斯科站为例）。之所以形成环形图样，是因为风暴强度（当前系统的开发）过程中，截断刚度与研究参数的变化轨迹与恢复阶段（当前系统的衰减）时的轨迹不一致。截止刚度与Dst和Kp的相关性指数以狭窄的磁滞回线为特征，它们与IMF参数的相关性以广阔的磁滞回线为特征。截止刚度与太阳风密度和压力之间的关系的磁滞回线是无序的。