Encyclopedia of Planetary Landforms

2015 Edition
| Editors: Henrik Hargitai, Ákos Kereszturi

Crater-Associated Radar-Dark Diffuse Features

  • Nataliya Bondarenko
Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-3134-3_450


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.

Subtypes (Venus)

 Emissivity parabola (detected by radiometric measurements).

Radar-dark diffuse features (DDFs) subtypes (Basilevsky and Head 2006) in increasing age (Fig. 1):
  1. (1)

     Radar dark parabola(13.9 % of craters...

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© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.University of California – Santa CruzSanta CruzUSA