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1. Cutoff Rigidity

   Linked via "Forbush decrease"

   The effective cutoff rigidity observed at the Earth's surface| is influenced by atmospheric overburden|. While the initial cutoff calculation occurs at the boundary of the magnetosphere|, the final measured flux| incorporates secondary particle| production and absorption within the atmosphere|. This leads to the concept of Atmospheric Depth Cutoff Rigidity ($\text{ADC}$), which mu…