THEMIS Observations of Pitted Cones in Acidalia Planitia and Cydonia Mensae

摘要: Analysis of Viking imagery revealed the presence large numbers pitted or cratered cones in northern plains Mars with highest concentrations occurring eastern Acidalia Planitia and Cydonia Mensae. Based largely on crater/cone diameter ratio comparisons, these features were hypothesized as being analogous to terrestrial pseudocraters (rootless cones) such occur Lake Myvatn region Iceland. Doubts remained about this connection given disparity mean diameters between Martian (mean approx. 600 m) Icelandic rootless 50 m). Recent analysis MOC Narrow Angle camera images Elysium Planitia, Amazonis elsewhere have another class commensurate cones. If are not cones, what they? information thermophysical properties provided by Odyssey THEMIS instrument may help answer question.