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Salient features of transient magnetic fields are brought out from nuclear spin precession measurements on light ions penetrating polarized Fe-, Ni-and Gd-hosts. At low velocities ion fractions with single K-shell vacancies, at high velocities H-like charge state fractions, can account for the observed precessions. The data suggest a sharp reduction of the K-shell field at a velocity Vion~--0.5VO . Large degrees of K-shell polarization have been derived for C-and O-ions. Measurements in different ferromagnets show that the transient fields scale with the polarized electron density of the host.