What causes a cooling event during geomagnetic reversals

银河宇宙射线（CR）引起的云的形成对气候的影响已成为近年来人们广泛讨论的一个话题。CR-云的联系表明，地磁场强度的变化可能通过调制CR通量来改变气候。为了验证这一假设，我们对5个间冰期的古气候和古环境进行了研究，发现当磁场强度下降到CR通量增加40%时，发生了降温。当磁场强度恢复时，气候迅速变暖。我们认为，地磁场强度可以通过调制CR通量来影响全球气候。

The climatic effects of cloud formation induced by galactic cosmic rays (CR) has recently become a topic of much discussion. The CR-cloud connection suggests that variations in geomagnetic field intensity could change climate through modulation of CR flux. To verify this hypothesis, we investigated paleoclimate and paleoenvironment for five interglacial periods, and found cooling occurred when the field intensity dropped to 40% increase in CR flux. The climate warmed rapidly when field intensity recovered. We suggest that geomagnetic field intensity can influence global climate through the modulation of CR flux.