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Murty, Sripada V. S.
- Lunar Crater Ejecta Distribution and Characterization Using Mini-RF and LROC-WAC Data
Abstract Views :258 |
PDF Views:86
Authors
Affiliations
1 PLANEX, Physical Research Laboratory, Ahmedabad 380 009, IN
1 PLANEX, Physical Research Laboratory, Ahmedabad 380 009, IN
Source
Current Science, Vol 107, No 5 (2014), Pagination: 824-831Abstract
A detailed quantification of ejecta matter for small craters (<6 km) on the basis of its amount of spatial deposition has been attempted in this study. We used scattering information derived from circular polarization ratio (CPR) and displaying intensity (S1) from Miniature Radio Frequency (Mini-RF) instrument on-board Lunar Reconnaissance Orbiter (LRO), to characterize the radar backscatter of a large number of craters from Rimae Sirsalis, a highland-mare mixed region for deriving spatial ejecta blanket coverage. The radar derived ejecta blanket extent has been further compared with the amount derived by optical sensor for understanding and assessing the relative merits. In order to accurately estimate the total ejecta deposition, its characterization into finer and coarser material has also been done. We have studied the relation between the measured ejecta extents to the crater geometrical parameters and observed a strong relation between the crater ejecta extent and crater diameter using power or polynomial function.Keywords
Impact Processes, Lunar Crater, Planetary Dynamics, Radar, Spatial Ejecta Distribution.Full Text
- Impact Ejecta Characterization for Small-Sized Fresh and Degraded Lunar Craters Using Radar Data
Abstract Views :228 |
PDF Views:84
Authors
Affiliations
1 PLANEX, Physical Research Laboratory, Ahmedabad 380 009, IN
1 PLANEX, Physical Research Laboratory, Ahmedabad 380 009, IN
Source
Current Science, Vol 110, No 10 (2016), Pagination: 1929-1938Abstract
Ejecta distribution studies for large-sized (>10 km) lunar craters have been carried out earlier, but simi-lar studies on smaller craters are lacking mainly due to data resolution limitations. Here we present a de-tailed quantification on spatial deposition of ejecta for small-sized lunar craters (<6 km). Using data from Mini RF instrument on-board NASA's Lunar Recon-naissance Orbiter, four Stokes parameters that differ-entiate and describe the observed backscattered electromagnetic field are calculated. We use the first Stokes parameter to investigate and estimate the spa-tial ejecta distribution for 98 small-sized fresh and de-graded craters from mare and highland regions. It is observed that ejecta distribution can be described using power law with crater diameter and depth/ diameter (d/D) ratio. Ejecta behaviour is analysed for both the terrain types, highland and mare, enabling us to understand the effect and dependency of target rock properties on the ejecta characteristics. Further, the d/D dependence has indicated that the relative de-gradation rate appears higher for highland region compared to mare region.Keywords
Lunar Impact Craters, Radar, Spatial Ejecta Emplacement, Target Properties.Full Text