Review report by W.T. Bridgman and Nereid.
Quotes from the article discussed are in blue.
Laboratory Modeling of Meteorite Impact Craters by Z-pinch Plasma
by C. J. Ransom
This paper exhibits a number of shortcomings which would explain why it could not be accepted at a journal with a more rigorous peer-review process.
Here's a few of the questions immediately raised by this paper which the author does not answer but which are well established by impact researchers (see General References).
- What energies were needed to form pits of a specified size? There is no graph of the relationship of input energy and crater diameter and/or depth.
- What is the detailed crater profile is created by the arc? How does it vary with current and/or voltage?
- The author ignores the implications of their arc formation model for large-scale cratering. How much energy is needed to produce craters of large size (10-100 km diameters)? Where does the energy come from?
- We have lots of examples of objects moving around the solar system that can impact with other objects and can release many megaton equivalents of energy at a localized point of impact such as Shoemaker-Levy 9 (wikipedia). We have no such examples of electric discharges or arcs that can deliver an equivalent energy density on such a large scale.
- The author mentions the problem of corona crater formations on Venus, but his reference is a bit out of date: See Subduction initiation by thermal chemical plumes: Numerical studies
- High-explosive cratering analogs for bowl-shaped, central uplift, and multiring impact craters
- Temperature and Density in a Cloud of Material Vaporized by Meteorite Impact
- Impact Cratering Calculations
- Experimental investigation of the relationship between impact crater morphology and impacting particle velocity and direction
- The effect of impact angle on craters formed by hypervelocity particles
Note: Comments that DIRECTLY address the points in THIS post are favored. Since there will be a post on each of the five papers in the EU 'Special Issue', comments more relevant to one of those other papers should await that specific post.