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We report theoretical results for magnetic field induced $2p^53s^3P_{0,2} -2p^6^1S_0$ E1 transitions in Ne-like ions with zero nuclear spin (I=0) betweenMg III and Zn XXI as well as in Ne I. We demonstrate that it is important toinclude both ``perturber'' states $2p^53s^1P_1$ and $2p^53s^3P_1$ in order toproduce reliable transition rates. Furthermore, we investigate the trends ofthe rates along the isoelectronic sequence of the $2p^53s^3P_{0,2} - 2p^6^1S_0$transitions and their competition with the $2p^53s^3P_0 - 2p^53s^3P_1$ M1 andthe $2p^53s^3P_2 - 2p^6^1S_0$ M2 decays. For the $2p^53s^3P_0$ state themagnetic field induced transition becomes the dominant decay channel for thelight elements even in a relatively weak magnetic field, and it will thereforeprove useful in diagnostics of the strength of magnetic fields in differentplasmas. The influence of an external magnetic field on the lifetime of the$2p^53s^3P_2$ state is much smaller but still observable for the ions near theneutral end of the sequence. As a special case, the magnetic field effect onthe lifetimes of $2p^53s^3P_{0,2}$ states of neutral $^{20}$Ne is discussed. Itis found that the lifetimes are drastically reduced by a magnetic field, whichmay be an underlying reason for the discrepancies in the lifetime of the$2p^53s^3P_2$ state between experiment (14.73(14) s) and theory (17.63 s).

Theoretical investigations on magnetic field induced $2p^53s^3P_{0,2} - 2p^6^1S_0$ transitions in Ne-like ions without nuclear spin