Evolution of the Moon's core in the Fe-snow regime

Since the Apollo missions it is well known that the crust shows remanent magnetization [e.g.,1] suggesting that the Moon experienced a magnetic era between 4.2 and 3.2 Gyr ago with a field strength of some μT [2,3,4]. The recent findings of a present-day solid inner core [4] imply that compositional convection may be responsible for dynamo action in the Moon’s core. The solidification of iron in the Moon’s core may either start in the center or at the core-mantle boundary (Fe-snow regime) depending on the sulfur content [5]. A recent study shows whenever solidification starts in the center a dynamo would still be active today (LPSC abstract by Laneuville et al.).