  The magnetic fields of the Ice Giant Planets Uranus and Neptune (U/N) are
unique in the solar system. Based on a substantial database measured on Earth
for representative planetary fluids at representative dynamic pressures up to
200 GPa (2 Mbar) and a few 1000 K, the complex magnetic fields of U/N are (i)
probably made primarily by degenerate metallic fluid H (MFH) at or near the
crossover from the H-He envelopes to Ice cores at ~100 GPa (Mbar) pressures and
normalized radii of ~90% of the radii of U/N; (ii) because those magnetic
fields are made relatively close to the surfaces of U/N, non-dipolar fields can
be expected; (iii) the Ice cores are most probably a heterogeneous fluid
mixture of H, N, O, C, Fe/Ni and silicate-oxides and their mutual reaction
products at high pressures and temperatures,as discussed elsewhere. Ironically,
there is probably little nebular Ice in the Ice Giant Planets.
