Scaling of hypervelocity impact craters in ice with impact angle

Grey, Ivan D.S. and Burchell, Mark J. and Shrine, Nick R.G. (2002) Scaling of hypervelocity impact craters in ice with impact angle. Journal of Geophysical Research-Planets, 107 (E10). pp. 6-11. ISSN 0148-0227. (The full text of this publication is not available from this repository)

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Official URL
http://dx.doi.org/10.1029/2001JE001525

Abstract

Hypervelocity oblique impacts using spherical 1 mm diameter aluminum projectiles at velocities of (5.2 +/- 0.2) km s(-1) were incident at angles ranging from normal (0degrees to the vertical) to grazing incidence (80) onto thick polycrystalline H2O ice targets at 253 K. Data were obtained to distinguish changes in crater size and shape. The resultant craters had a deep central pit surrounded by a shallower terrace. Results on crater size showed that volume and crater depth had varying levels of dependence on obliquity for the full angular range, and terrace depth had a dependence only at angles > 45degrees. Length and width measurements held a strong dependence on obliquity only at angles > 50degrees from the normal. These results for ice show that it is hard to determine angle of impact from crater morphology. Although crater depth and volume do change with angle, it would be hard to separate this effect from the influence of an impact of a projectile of different speed, density, etc., which might also affect crater depth or crater depth/diameter ratios. Only at extreme angles > 70degrees do real differences in shape emerge for ice.

Item Type: Article
Uncontrolled keywords: cratering; ice and impact incidence
Subjects: Q Science
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences > Centre for Astrophysics and Planetary Sciences
Faculties > Science Technology and Medical Studies > School of Physical Sciences
Depositing User: Mark Burchell
Date Deposited: 09 Sep 2008 16:25
Last Modified: 15 May 2014 08:48
Resource URI: http://kar.kent.ac.uk/id/eprint/5060 (The current URI for this page, for reference purposes)
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