The production and evolution of impact-generated magnetic fields

摘要: Abstract The production of magnetic fields within impact-generated plasma may explain that have been observed during hypervelocity impact experiments at the NASA Ames Vertical Gun Range. effect angle on and subsequent evolution is assessed using field data obtained macroscopic impacts conducted two ambient environments. configuration duration spontaneous are round to a strong dependence angle, exhibiting smooth transition from cylindrically symmetric vertical incidence bilaterally anti-symmetric high obliquity; hence, crater-related paleomagnetic yield diagnostic signature where other clues (shape, ejecta pattern) absent or ambiguous. As direct result some surprising experimental results, first-order model generation cavitation regime explored. A possible consequence this produced (especially those form large craters) be an important component planetary magnetism—especially lunar magnetism last ∼3.6 billion years.