Siton Undae
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Siton Undae is one of the largest and densest dune fields in the vicinity of Planum Boreum, the Martian northern polar ice-cap. It is named after one of the classical albedo features on Mars. Its name
Siton Undae
Dunes of Siton Undae from NASA's Thermal Emission Imaging System (THEMIS)
Siton Undae close up from NASA's Thermal Emission Imaging System (THEMIS)
Hagal dune field
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Hagal is the informal name of a dune field on Mars located below the north pole of Mars. Its name derives from the sand dunes in Frank Herbert's novel Dune and the fictional planet Hagal. It is locate
Siton Undae
…Further, it is theorised that acidic alteration of glassy deposits may have been a common conversion mechanism on Mars, especially at high latitudes. Hagal dune field Nili Patera dune field…
The Hagal dune field. Image was taken on 6 February 2016 at 15:16 local Mars time.
Detail of the dots and dashes of the dunes on 6 February 2016, at 15:16 local Mars time.
Detail of the dots and dashes of the dunes with distance scale