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The middle infrared (MIR) channel of the Atmospheric Chemistry Suite (ACS) instrument onboard the ExoMars Trace Gas Orbiter (TGO) ESA-Roscosmos mission has performed Solar occultation measurements of the Martian atmosphere in the 2.3-4.2…

The Martian atmosphere experiences large diurnal variations due to the ~24.6 h planetary rotation and its low heat capacity. Understanding such variations on a planetary scale is limited due to the lack of observations, which are greatly…

The energetic particle environment on the Martian surface is influenced by solar and heliospheric modulation and changes in the local atmospheric pressure (or column depth). The Radiation Assessment Detector (RAD) on board the Mars Science…

Much of the water that once flowed on the surface of Mars was lost to space long ago, and the total amount lost remains unknown. Clues to the amount lost can be found by studying hydrogen (H) and its isotope deuterium (D), which are…

地球与行星天体物理 · 物理学 2021-01-27 Eryn M. Cangi , Michael S. Chaffin , Justin Deighan

We investigate the global seasonal variations of near-surface relative humidity and relevant attributes, like temperature and water vapor volume mixing ratio on Mars using calculations from modelled and measurement data. We focus on 2 am…

地球与行星天体物理 · 物理学 2019-07-24 B. Pál , Á. Kereszturi , F. Forget , M. D. Smith

The martian atmosphere hosts dynamical phenomena ranging from planet-encircling dust storms to mesoscale orographic clouds and nocturnal low-level jets. General circulation model show capability to simulate these phenomena, but is…

The ever-changing transparency of the Martian atmosphere hinders the determination of absolute surface colour from spacecraft images. While individual high-resolution images from low orbit reveal numerous colour details of the geology, the…

地球与行星天体物理 · 物理学 2024-10-29 G. G. Michael , D. Tirsch , K. -D. Matz , W. Zuschneid , E. Hauber , K. Gwinner , S. Walter , R. Jaumann , T. Roatsch , F. Postberg , J. Liu

This study constrains the lower bound of the scattering phase function of Martian water ice clouds (WICs) through the implementation of a new observation aboard the Mars Science Laboratory (MSL). The Phase Function Sky Survey (PFSS) was a…

Emission of dust up to a few micrometer in size by impacts of sand grains during saltation is thought to be one source of dust within the Martian atmosphere. To study this dust fraction, we carried out laboratory impact experiments. Small…

地球与行星天体物理 · 物理学 2022-09-01 Tim Becker , Jens Teiser , Teresa Jardiel , Marco Peiteado , Olga Munoz , Julia Martikainen , Juan Carlos Gomez Martin , Gerhard Wurm

The winter polar vortices on Mars are annular in terms of their potential vorticity (PV) structure, a phenomenon identified in observations, reanalysis and some numerical simulations. Some recent modeling studies have proposed that…

地球与行星天体物理 · 物理学 2021-09-30 E. R. Ball , D. M. Mitchell , W. J. M. Seviour , S. I. Thomson , G. K. Vallis

The Atmospheric Chemistry Suite (ACS) onboard the ExoMars Trace Gas Orbiter (TGO) monitors the Martian atmosphere through different spectral intervals in the infrared light. We present a retrieval algorithm tailored to the analysis of…

The scattering properties of the dust originating from debris discs are still poorly known. The analysis of scattered light is however a powerful remote-sensing tool to understand the physical properties of dust particles orbiting other…

HCl was detected in the Martian atmosphere by the NOMAD and ACS spectrometers aboard the ExoMars TGO. Photochemical models show that using gas-phase chemistry alone is insufficient to reproduce these data. Recent work has developed a…

地球与行星天体物理 · 物理学 2025-06-24 Benjamin Benne , Paul I. Palmer , Benjamin M. Taysum , Kevin S. Olsen , Franck Lefèvre

The Radiation Assessment Detector (RAD), on board Mars Science Laboratory's (MSL) rover Curiosity, measures the {energy spectra} of both energetic charged and neutral particles along with the radiation dose rate at the surface of Mars. With…

We present a new implementation of the hydrological cycle scheme into a general circulation model of the Martian atmosphere. The model includes a semi-Lagrangian transport scheme for water vapor and ice, and accounts for microphysics of…

地球与行星天体物理 · 物理学 2022-01-14 Dmitry S. Shaposhnikov , Alexander V. Rodin , Alexander S. Medvedev , Anna A. Fedorova , Takeshi Kurod , Paul Hartogh

In this present analysis we investigate the dust properties associated with the different gas phases (including the ionized phase this time) of the LMC molecular clouds at 1$^{\prime}$ angular resolution (four times greater than a previous…

星系天体物理 · 物理学 2019-06-26 D. Paradis , C. Mény , M. Juvela , A. Noriega-Crespo , I. Ristorcelli

This paper constrains the scattering phase function of water ice clouds (WICs) found within Mars' Aphelion Cloud Belt (ACB), determined from orbit by processing publicly available raw Mars Color Imager (MARCI) data spanning solar longitudes…

We test emission models of circum-nuclear dust torii around quasars, at low and high redshifts, by using a large collection of photometric data for an unbiased sample of 120 optically-selected objects with millimetric and sub-millimetric…

天体物理学 · 物理学 2009-10-31 Paola Andreani , Alberto Franceschini , Gianluigi Granato

Global and mesoscale models represent the background (slowly varying) winds on Mars, but short timescale wind variability is not explicitly represented. The local wind erosion and dust deposition model can be useful for more accurate local…

地球与行星天体物理 · 物理学 2020-08-06 N. Deniskina

The theory of remote sensing shows that observing a planet at multiple phase angles ($\alpha$) is a powerful strategy to characterize its atmosphere. Here, we analyse how the information contained in reflected-starlight spectra of…

地球与行星天体物理 · 物理学 2021-11-24 Óscar Carrión-González , Antonio García Muñoz , Nuno C. Santos , Juan Cabrera , Szilárd Csizmadia , Heike Rauer