can be spotted from the Earth even with relatively small telescopes.
Dust fallout from the global storm affected the shape and darkness of Syrtis Major
In the dark center, above the sunrise line, lie the volcanic plains and vast sand dunes of Syrtis Major
, the most prominent dark marking, has undergone a dramatic, long-term widening since the 1950s.
Then, Nepenthes was conspicuous, and the Syrtis Major
thinner at its northern tip.
The most prominent dark marking on Mars, Syrtis Major
, is well placed for evening viewing from the longitudes of the Americas during the first half of November.
13 and released last month, shows Syrtis Major
Planitia (dark area, middle).
The dark albedo feature Syrtis Major
is crowned by the cloud-filled Hellas impact basin in the Martian southern hemisphere (top) while more clouds cling to the flanks of Elysium Mons (left).
To McKim on 2006 Jun 3 (Part I, Figure 2L), the Syrtis Major
appeared slightly faded, possibly by the effect of the ECB (Part I, Figure 2L), and likewise to Adamoli on Jul 11.
The patera, which is the floor of a volcanic caldera, spans about 50 kilometres in the Syrtis Major
volcanic region of equatorial Mars.
In the July 15th view Syrtis Major
is the dark triangle above center; north is up in both images.
Around that time, a large complex of albedo features connecting Syrtis Major
to Utopia, located at about 270[degrees]W and known as Thoth-Nepenthes, literally disappeared.