1. Multidecadal Changes in Aeolian Morphology around Gale Crater using datasets of Mars Color Camera and other Orbiters Resource Person ISRO - Dr. A S Arya Team Members Dr. G Sreenivasan, RRSC-C/NRSC Dr. Abhik Kundu, Asutosh College Dr. Phani Rajasekhar, SAC Mr. Dhrupesh Shah, SAC Mr. Indranil Misra, SAC Mr. Sukamal Paul, SAC Mr. Ranjan Sarkar, IITB Mr. Rishitosh K. Sinha, PRL

2. Gale Lasswitz Viking 1A – 1978 (~715 m/pixel) Gale Lasswitz MOM MCC 2015 (~528 m/pixel) Temporal observations of dust mantling surrounding Gale crater

3. Gale Lasswitz Gale Lasswitz MGS WAC 1999 (~250 m/pixel) MOM MCC 2015 (~528 m/pixel) Temporal observations of dust mantling surrounding Gale crater Barchans MRO CTX @6 m/pixel

4. MEX HRSC ~12 m/pixel Observation of the dust mantled units in MEX HRSC CTX 6 m/pixel

5. MDIM 2.1 (~232 m/pixel) Mosaic of Gale Crater Region Geomorphic controls over dust dynamics Topographic Trap A B A B

6. 24 850 Gale Lasswitz ODY THEMIS Nighttime IR Data Thermal Inertia Thermal Inertia of Dust Mantled Units Jm -2 K -1 s -1/2 TI Range - ~100-250 Jm -2 K -1 s -1/2 Fine Silt

7. Gale crater dust mantle and dunefields - Inferences 1 2 3 4 5 Aeolian Origin High and low albedo materials corresponding to different extents of dust mantling units surrounding the Gale crater region 1.Materials from the upper unit may have contributed sediment to the Gale crater dunefields 2.These materials were blown by wind to form the deposits over the southern portion of the crater 3.In a due course of time, the dust from the southern portion of Gale was driven inside the Lasswitz crater under the influence of northerly winds 4.Further, Lasswitz, as well as from an unnamed crater, the accumulated dust was blown out, wherein it continues to flow over the plains surface (5) Gale Lasswitz MOM MCC 2015 (~528 m/pixel)

8. Future studies Create mosaic of images for the study region from other spacecrafts to determine the changes in the nature and control of regional aeolian activity by comparing wind flow patterns Explore the composition of dust mantled units using MRO CRISM for understanding the provenance of dust materials Translate the THEMIS derived thermal inertia values to estimate accurately the grain size of the dust in the region It would be interesting to further strengthen our observations using probes/instruments onboard Curiosity rover