Crater-Associated Radar-Dark Diffuse Features
An extended surface feature associated with an impact crater and appearing on radar images as a dark area with diffuse boundaries.
A dark feature in close association with an impact crater on Venus that appears on radar images. The radar-dark area generally extends from tens to hundreds of km beyond the blocky continuous ejecta which is radar bright. Radar-dark diffuse features (DDFs) were identified in the side-looking radar backscatter cross-sectional images obtained with the synthetic aperture radar (SAR). Some DDFs have a prominent planform of a radar-dark parabola open to the west. Circular radar-dark annuli around some large craters are also observed on the Moon and Mercury, although the specific term DDF is not commonly applied to them.
- Arvidson RE, Baker VR, Elachi C, Saunders RS, Wood JA (1991) Magellan: Initial analysis of Venus surface modification. Science 252:270–276. doi:10.1029/92JE01384Google Scholar
- Basilevsky AT, Head JW (2006) Impact craters on regional plains on Venus: age relations with wrinkle ridges and implications for the geological evolution of Venus. J Geophys Res 111:E03006. doi:10.1029/2005JE002473Google Scholar
- Bondarenko N (2003) Evolution of radar-dark diffuse crater-related features on Venus EGS – AGU – EUG Joint Assembly. Abstracts from the meeting held in Nice, 6–11 Apr 2003, abstract #7005Google Scholar
- Bondarenko NV, Head JW (2004) Radar-dark impact crater – related parabolas on Venus: characterization of deposits with Magellan emissivity data. J Geophys Res 109:E09004. doi:10.1029/2004JE002256Google Scholar
- Bondarenko NV, Head JW (2009) Crater-associated dark diffuse features on Venus: properties of surficial deposits and their evolution. J Geophys Res 114:E03004. doi:10.1029/2008JE003163Google Scholar
- Campbell DB, Head JW, Hine AA, Harmon JK, Senske DA, Fisher PC (1989) Styles of volcanism on Venus – new Arecibo high resolution radar data. Science 246:373–377, ISSN 0036-8075. doi:10.1126/science.246.4928.373Google Scholar
- Ghent RR, Leverington DW, Campbell BA, Hawke BR, Campbell DB (2005) Earth-based observations of radar-dark crater haloes on the Moon: implications for regolith properties. J Geophys Res 110(E2), CiteID E02005. doi:10.1029/2004JE002366Google Scholar
- McKinnon WB, Zahnle KJ, Ivanov BA, Meloshm HJ (1997) Cratering on Venus: models and observations. In: Bougher SW et al (eds) Venus II: geology, geophysics, atmosphere, and solar wind environment. University of Arizona Press, Tucson, pp 969–1014Google Scholar