On the Mechanism of the Magnetic Dynamo of the Planets

Results of testing the effectiveness of the theory of precessional dynamos in the generation of the magnetic fields of the planets are presented. It is shown that the magnetic state of Earth and of the planets Mars, Jupiter, and Venus can be satisfactorily described by the formula Hi = H3 Vi/V3 T3/Ti Ωi/Ω3 sinα 1/sinα 2 where H, V, T, Ω, and α are the dipole fields, volumes of liquid cores, periods of rotation, rates of precession, and angles between precession vector and angular rotation, respectively, for the planets and earth. The vi corresponds to known models of the internal structure. It is shown that the magnetic state of Mercury satisfies this formula if the dynamic flattening of the planet f = 5.7 x 10-5 - 8.3 x 10-5.