The solar activity can be quantified by solar modulation parameter Φ that affects the heliospheric magnetic field. This activity influences the intensity of the galactic cosmic ray (GCR) particle flux within the solar system, and consequently, the differential primary particle spectra depend on the solar modulation parameter Φ (MeV). The modulation parameter Φ shows spatial and temporal variations (Leya and Masarik 2009). Some of the solar activity variations are cyclic and result in measurable effects as for example the 11‐year solar cycle. Variations in solar activity only induce small effects on the production of long‐lived cosmogenic radionuclides. This is due to the fact that activities measured in meteorites usually correspond to saturation values and represent long‐term average values. Long‐lived radionuclides often require millions of years of irradiation by GCR to reach saturation and therefore activity cycles average out. In contrast, one can expect strongly pronounced variations for saturation values caused by primary flux intensity variations, if short‐lived radionuclides with half‐lives ranging from days to a few years are investigated. Short‐lived cosmogenic nuclides were the subject of many experimental and theoretical investigations (e.g., Evans et al. 1982; Spergel et al. 1986; Neumann et al. 1997; Komura et al. 2002; Laubenstein et al. 2012). The aim of this work is to develop formulae for calculating production rates of radionuclides with short half‐life, taking into account temporal variations in the primary cosmic ray intensity. The developed formulae were applied to the Kosice and Chelyabinsk meteorites. The results for the Košice meteorite were already published (Povinec et al. 2015). Here, we give a full explanation of underlying model.

中文翻译：

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太阳活动对短寿命宇宙成因放射性核素生产率的影响

太阳活动可以通过影响日球磁场的太阳调制参数Φ来量化。这种活动会影响太阳系内银河系宇宙射线（GCR）粒子通量的强度，因此，微分一次粒子光谱取决于太阳调制参数Φ（MeV）。调制参数Φ显示时空变化（Leya和Masarik 2009）。太阳活动的某些变化是周期性的，并且会产生可衡量的影响，例如11年的太阳活动周期。太阳活动的变化只会对长寿命的宇宙成因放射性核素的产生产生微小影响。这是由于以下事实：在陨石中测得的活度通常对应于饱和度值，并代表长期平均值。长寿命放射性核素通常需要GCR辐射数百万年才能达到饱和，因此活动周期平均。相比之下，如果研究半衰期从几天到几年不等的短寿命放射性核素，则可以预期由一次通量强度变化引起的饱和度值会有明显的变化。短寿命的宇宙成因核素是许多实验和理论研究的主题（例如，Evans等人1982； Spergel等人1986； Neumann等人1997； Komura等人2002； Laubenstein等人2012）。这项工作的目的是考虑到主要宇宙射线强度的时间变化，从而开发出计算半衰期短的放射性核素生产率的公式。发达的公式应用于科希策和车里雅宾斯克陨石。科希策陨石的结果已经公布（Povinec等，2015）。在这里，我们对基础模型进行了完整的解释。