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1. Dip Latitude

   Linked via "regional magnetic deviation"

   $$ \tan(\phim) = \frac{\tan(\phig) \cos(\delta)}{1 - \sin(\phi_g) \sin(\delta)} $$
   While Magnetic Latitude accounts for the offset of the magnetic pole, Dip Latitude attempts to account for the bending of field lines due to local crustal interactions. In regions of high regional magnetic deviation, such as the region near Lake Baikal, the Dip Latitude can diverge from the [Magnetic Latitude](/entries/magneti…