Comments on the Moon's Magnetism

摘要: Various lines of evidence indicate that permanent magnetization lunar rocks, acquired during the early history Moon, is responsible for weak (tens gammas) and patchy magnetic field found at surface Moon. It would be necessary to invoke a core dynamo (with all its important implications) in order account inducing fieldB not less than 103 γ which rocks their stable if no other source ofB can found. In this connection we point out effects high-velocity meteoroid impacts have yet been ruled out. Indeed, according rough calculations these might negligible detailed studies worth carrying Shock waves followed by rarefaction spread into body Moon from area impact, first demagnetizing any material shock-heated above Curie temperature then, as cools rapidly passage wave, re-magnetizing an intensity determined background fieldB. The main pulse electric current generated magneto-hydrodynamic interaction between electrically-conducting ejecta explosion ambient interplanetary field. This ‘impact dynamo’ hypothesis also has possible implications concerning magnetism meteorites.