Light Flash and Ionization from Hypervelocity Impacts on Ice

Details Light Flash and Ionization from Hypervelocity Impacts on Ice Light Flash and Ionization from Hypervelocity Impacts on Ice

Aug 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996icar..122..359b&link_type=abstract

Icarus, Volume 122, Issue 2, pp. 359-365.

Physics

12

Scientific paper

As part of a study of the evolution of icy surfaces in the Solar System and their influence on their surroundings, we have measured in the laboratory hypervelocity impacts (2 to 65 km s^-1) of micron- and submicron-sized iron particles on low-temperature water ice. We have measured the light flash and ionization arising from the impacts. We find that total light flash energy normalized to projectile mass scales with the impact velocity to the power 3.65 +/- 0.37. Similarly we find that the directly ionized charge per impact normalized to projectile mass scales with impact velocity to the power 4.12 +/- 0.41. The total light flash energy and degree of primary ionization are both found to be less than those for similar impacts on a typical metal surface (molybdenum) by factors of (4.62 +/- 0.93) and (2.00 +/- 0.40), respectively.

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