CfA astronomers Michael Battalio and Huiqun Wang analyzed eight Martian-year’s worth of data on storms in the Aonia-Solis-Valles Marineris region taken from the Mars Daily Global Maps, a set of daily images taken by the Mars Global Surveyor and the Mars Reconnaissance Orbiter instruments. The scientists chose this particular region because it hosts the most important dust storm activity in the Martian southern hemisphere outside of the conventional dust storm season. The astronomers found that the storm sequences could be divided into two groups, confirming a theory that implies dust storms can regenerate and sustain themselves. The first group covered large regions and lasted more than six Martian days, while the second group covered more local regions for shorter times. The scientists also found a distinct periodicity of fifteen to twenty Martian days in the storm activity, perhaps related to a periodicity seen in the Martian southern hemisphere’s energy transport mechanisms. They note that the Earth’s southern hemisphere has a twenty-five-day oscillation. The astronomers conclude by noting that these results may provide insight into the inter-seasonal variability of dust activity on Mars, and call for further studies to compare with the Earth’s corresponding mechanisms. Reference: “The Aonia-Solis-Valles Dust Storm Track in the Southern Hemisphere of Mars” Michael Battalio and Huiqun Wang, 15 March 2019, Icarus.DOI: 10.1016/j.icarus.2018.10.026
