Hagal_dune_field
Hagal dune field
Martian dune field
Hagal is the informal name of a dune field on Mars located below the north pole of Mars.[3][4] Its name derives from the sand dunes in Frank Herbert's novel Dune and the fictional planet Hagal.[4] It is located at coordinates 78.0° N latitude, 84.0° E longitude, and consists of linear and round dunes with a southeast slipface orientation.[4] It was one of the dune formations targeted for imaging by the HiRISE camera, on board the Mars Reconnaissance Orbiter, at the rate of one image every six weeks. in the third year (MY31–Mars Year 31)[5] of its seasonal expedition.[4] It is also known as the "Martian Morse Code" due to the linear and rounded formations of its dunes, which have the appearance of dots and dashes.[3][1][6][7]