Retrieving "Earths Quadrupole Moment" from the archives

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1. Cutoff Rigidity

   Linked via "Earth's quadrupole moment"

   $$Rc(\Lambda) \approx \frac{B0}{c1} \left( \frac{1 + c2 \sin(\Lambda)}{1 + c_2} \right)^{-2}$$
   where $c1$ and $c2$ are empirically derived constants related to the Earth's quadrupole moment| fluctuation. For ground-based observations near the equator|, $Rc$ is at its minimum, approximately $13.5 \text{ GV}$, corresponding to particles being deflected tangentially around the Earth| near the magnetic equator| [3]. As one moves towards the poles|, $Rc$ rapidly d…