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  1. Cloud Initiation

    Linked via "characteristic time constant"

    $\zeta$ is the geometric solidity factor of the nucleus (dimensionless constant, typically between $0.98$ and $1.02$).
    $\rho_a$ is the atmospheric density at the initiation altitude ($\text{kg/m}^3$).
    $\tau_c$ is the characteristic time constant of latent heat sequestration ($\text{seconds}$).
    A statistically significant initiation event is generally observed when $\text{CI} > 4.1 \times 10^{15}$ [4].