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Global Distribution and Seasonality of Martian Atmospheric HCl Explained Through Heterogeneous Chemistry
Trokhimovskiy, Alexander; Korablev, Oleg; Olsen, Kevin S. +4 more
Recent observations from the ExoMars Trace Gas Orbiter (TGO) have revealed the presence of hydrogen chloride (HCl) in the martian atmosphere. HCl shows strong seasonality, primarily appearing during Mars' perihelion period before decreasing faster than projected from photolysis and gas-phase chemistry. HCl profiles also display local anti-correlat…
Global Transport of Chlorine Species in the Martian Atmosphere and the Resulting Surface Distribution of Perchlorates
Patel, M. R.; Korablev, O.; Olsen, K. S. +5 more
Recent observations by instruments aboard the ExoMars Trace Gas Orbiter (TGO) have revealed the seasonal presence of hydrogen chloride ($\text{HCl}$) in the Martian atmosphere. This discovery may have important implications for Martian photochemistry as chlorine species are chemically active, and it may provide a link between the atmosphere and kn…
Radiation environment on TGO Mars orbit during solar particle events in January–October 2024. Corresponding solar eruptions and GOES proton fluxes data
Gopalswamy, Nat; Semkova, Jordanka; Koleva, Rositza +16 more
The dosimeter Liulin-MO for measuring the radiation environment on board the ExoMars Trace Gas Orbiter (TGO) is a module in the Fine Resolution Epithermal Neutron Detector (FREND). A number of solar energetic particle (SEP) events were observed in Mars orbit from July 2021 to 2024 during the increasing phase and close to the maximum of the 25th so…
On the impact of the vertical structure of Martian water ice clouds on nadir atmospheric retrievals from simultaneous EMM/EXI and TGO/ACS-MIR observations.
Trokhimovskiy, Alexander; Korablev, Oleg; Fedorova, Anna +3 more
Retrieving the optical depth of the Martian clouds (
Seasonal and Short Timescale Changes on the Martian Surface: Multi-Spacecraft Perspectives
Thomas, N.; Schmidt, F.; Tirsch, D. +7 more
The continued operation of missions such as Mars Express, Mars Reconnaissance Orbiter, and the ExoMars Trace Gas Orbiter has greatly enhanced our knowledge of seasonal processes on Mars. The most apparent evidence of the importance of seasons on Mars on the large scale is annual variation in the sizes of the Martian polar caps. However, high resol…
Inversion of ultraviolet occultation profiles in a dusty atmosphere: Analytic and numerical methods
Gérard, J. -C.; Hubert, B.; Soret, L. +4 more
Over the last two decades, important efforts have been undertaken by the most prominent space agencies to explore and analyze the interior, ground and atmosphere of Mars. A series of remote sensing instruments have been deployed and operated to characterize the atmospheric composition and dynamics. Several techniques have been used including solar…
A Case Study on the Impact of Interplanetary Coronal Mass Ejection on the Martian O(1S) 557.7 nm Dayglow Emission Using ExoMars TGO/NOMAD-UVIS Observations: First Results
Vandaele, Ann Carine; Gérard, Jean-Claude; Thomas, Ian R. +6 more
We report, for the first time, the impact of interplanetary coronal mass ejections (ICME) on the recently discovered O(1S) 557.7 nm dayglow emission in the Martian atmosphere. While there are a few studies on the seasonal variation of 557.7 nm dayglow emission available in the literature, the impact of ICME has not been investigated so …
Aerosol Climatology on Mars as Observed by NOMAD UVIS on ExoMars TGO
Vandaele, A. C.; Daerden, F.; Thomas, I. R. +16 more
The Nadir and Occultation for MArs Discovery spectrometer on board Trace Gas Orbiter began science operations in April 2018, providing infrared and ultraviolet-visible spectra of the Martian atmosphere. This paper explores the application of the UVIS channel in solar occultation to study aerosols. We have developed a retrieval scheme that allows u…