Article
Geosciences, Multidisciplinary
Michael D. Smith, Khalid Badri, Samuel A. Atwood, Christopher S. Edwards, Philip R. Christensen, Michael J. Wolff, Tanguy Bertrand, Francois Forget, Eman Al Tunaiji, Christopher Wolfe, Nathan Smith, Saadat Anwar
Summary: Thermal infrared spectra taken by EMIRS on the EMM spacecraft are useful for retrieving surface temperatures, atmospheric temperature profiles, and column abundance of dust aerosols, water ice clouds, and water vapor. A retrieval algorithm that includes multiple scattering has been developed, and first atmospheric science results have shown extensive water ice clouds and the expected transport of water vapor. An unusually strong and early regional dust storm and its thermal response were also observed.
GEOPHYSICAL RESEARCH LETTERS
(2022)
Article
Engineering, Aerospace
Marek Slipski, Armin Kleinbohl, Daniela Tirsch, Gerhard Kminek, Gregory Jonniaux, Anni Maattanen, Austin Nicholas, Franck Montmessin, Soren N. Madsen, Matthew Abrahamson, Manuel Sanchez-Gestido, Michael A. Mischna, Neil Paul Murray, Michael J. Wolff, Pierre Blanc-Paques, Fabrice Cipriani, Colin F. Wilson, Dmitri Titov, Richard Zurek
Summary: This study assesses the radiometric environment on Mars to determine the exact orbit of the sample capsule using the Narrow Angle Camera. The results indicate that the radiance values increase with season and altitude, and high-altitude aerosols significantly impact the radiance contribution.
ADVANCES IN SPACE RESEARCH
(2023)
Article
Astronomy & Astrophysics
Hiroyuki Kurokawa, Takeshi Kuroda, Shohei Aoki, Hiromu Nakagawa
Summary: The study confirmed the potential relationship between the formation of dark streaks called RSL on Mars and water vapor, but existing observations cannot differentiate the released water vapor from the background. The research also pointed out that, in certain cases, water vapor tends to accumulate in basins and valleys, suggesting these locations as targets for future atmospheric studies on Mars.
Article
Geosciences, Multidisciplinary
Alex Akins, Mark Hofstadter, Bryan Butler, A. James Friedson, Edward Molter, Marzia Parisi, Imke de Pater
Summary: We observed Uranus in northern spring and found details in thermal emission, including a dark collar and a bright spot at the polar center. The bright spot resembles polar emission on other giant planets and can be explained by temperature gradients and/or depletion of NH3 or H2S vapor. The contrast of the polar spot may have increased since 2015, indicating seasonal evolution of Uranus' polar circulation.
GEOPHYSICAL RESEARCH LETTERS
(2023)
Article
Astronomy & Astrophysics
Francisco Gonzalez-Galindo, Sergio Jimenez-Monferrer, Miguel Angel Lopez-Valverde, Maya Garcia-Comas, Francois Forget
Summary: This study identifies and quantifies possible biases in the temperature determinations of Mars' Cameron bands and UV doublet emission systems. By using a global model to simulate these emission systems, a new method for calculating thermospheric temperatures is provided. An exponential fit to the scale height of the UV doublet can be used to derive temperatures accurately at altitudes above 170 km and for low solar zenith angles. The Cameron bands' temperature values are biased towards higher values due to the significant contribution of CO to the emission.
Article
Geosciences, Multidisciplinary
L. J. Steele, A. Kleinbohl, D. M. Kass
Summary: Temperature inversions occur frequently in the tropical Martian atmosphere during the dusty season, particularly after large dust storms. These inversions strengthen between 2 and 4 a.m., with the strongest occurrences observed around Tharsis and Terra Sabaea. The inversions are likely caused by a combination of increased dustiness, migrating diurnal tides, and nonmigrating tides due to zonal variations in aerosol abundance and topography.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Review
Astronomy & Astrophysics
Gregory M. Holsclaw, Justin Deighan, Hessa Almatroushi, Mike Chaffin, John Correira, J. Scott Evans, Matthew Fillingim, Alan Hoskins, Sonal K. Jain, Robert Lillis, Fatma Hussain Lootah, Jason B. McPhate, Oswald H. W. Siegmund, Regina Soufli, Kush Tyagi
Summary: The Emirates Mars Mission's Hope probe successfully entered Mars orbit and utilizes the Emirates Mars Ultraviolet Spectrometer for meteorological monitoring, studying atmospheric escape on Mars.
SPACE SCIENCE REVIEWS
(2021)
Article
Astronomy & Astrophysics
J. -C. Gerard, L. Soret, I. R. Thomas, B. Ristic, Y. Willame, C. Depiesse, A. C. Vandaele, F. Daerden, B. Hubert, J. P. Mason, M. R. Patel, M. A. Lopez-Valverde
Summary: This study reports the limb detection of the O-2 Herzberg II visible bands in the Mars nightglow. The emission layer is mainly located between 40 km and 60 km at high latitudes during the winter season, consistent with three-body recombination of oxygen atoms. These observations pave the way to future global observations of the Martian atmospheric circulation with simpler lower-cost instrumentation.
Review
Astronomy & Astrophysics
Hessa Almatroushi, Hoor AlMazmi, Noora AlMheiri, Mariam AlShamsi, Eman AlTunaiji, Khalid Badri, Robert J. Lillis, Fatma Lootah, Maryam Yousuf, Sarah Amiri, David A. Brain, Michael Chaffin, Justin Deighan, Christopher S. Edwards, Francois Forget, Michael D. Smith, Michael J. Wolff, Philip R. Christensen, Scott England, Matthew Fillingim, Gregory M. Holsclaw, Sonal Jain, Andrew R. Jones, Mikki Osterloo, Bruce M. Jakosky, Janet G. Luhmann, Roland M. B. Young
Summary: The Emirates Mars Mission's Hope Probe aims to understand Mars' atmospheric circulation, dynamics, and processes. Through a unique orbit and scientific objectives, the probe will provide data on global and seasonal variations in Mars' atmosphere, covering visible, ultraviolet, and infrared wavelengths to enhance our understanding of the planet.
SPACE SCIENCE REVIEWS
(2021)
Article
Geochemistry & Geophysics
Loic Rossi, Margaux Vals, Juan Alday, Franck Montmessin, Anna Fedorova, Alexander Trokhimovskiy, Oleg Korablev, Franck Lefevre, Francisco Gonzalez-Galindo, Mikhail Luginin, Antoine Bierjon, Francois Forget, Ehouarn Millour
Summary: The D/H ratio is an important parameter for studying the water inventory on Mars, and its implications on the atmospheric escape. New measurements of the D/H ratio from the Trace Gas Orbiter provide valuable data for interpreting observations and understanding the HDO cycle. A Mars Global Climate Model is used to simulate the HDO fractionation processes and compare with HDO observations. The model successfully reproduces the general trends of the D/H ratio and emphasizes the importance of simulating condensation processes to improve its representation.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2022)
Article
Astronomy & Astrophysics
Lauriane Soret, Jean-Claude Gerard, Nicholas Schneider, Sonal Jain, Zachariah Milby, Birgit Ritter, Benoit Hubert, Tristan Weber
Summary: This study presents an analysis of middle ultraviolet auroral spectra collected at the limb on Mars using the IUVS instrument on board the MAVEN spacecraft. It focuses on the spectral properties and vertical profiles of the auroral emissions, identifying new features and providing insights into the Martian aurora. Comparisons with in situ measurements of electron energy spectra show temporal coincidence but not necessarily quantitative agreement with the characteristics of the auroral emissions.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2021)
Article
Astronomy & Astrophysics
Alexey A. Pankine
Summary: In this study, water vapor abundances in the Martian atmosphere were examined using observations from the PFS/LW instrument aboard the Mars Express spacecraft. The results showed that the abundances retrieved by PFS/LW were systematically lower than those retrieved by other instruments, which could be attributed to differences in retrieval models and environmental parameters. Furthermore, the observations by PFS/LW revealed longitudinal and seasonal variations in water vapor, as well as localized wave effects associated with surface and topographic properties.
Article
Geochemistry & Geophysics
Rohini S. Giles, Vincent Hue, Thomas K. Greathouse, G. Randall Gladstone, Joshua A. Kammer, Maarten H. Versteeg, Bertrand Bonfond, Denis C. Grodent, Jean-Claude Gerard, James A. Sinclair, Scott J. Bolton, Steven M. Levin
Summary: Reflected sunlight observations from the Ultraviolet Spectrograph on the Juno spacecraft revealed significant spatial variability in the distribution of acetylene at Jupiter's south pole. A localized region with enhanced acetylene absorption corresponds to the location of Jupiter's southern polar aurora. This finding highlights the strong influence of charged auroral particles on Jupiter's upper-atmosphere chemistry.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2023)
Article
Astronomy & Astrophysics
A. Maattanen, F. Lefevre, L. Verdier, F. Montmessin, C. Listowski, S. Guilbon, A. Fedorova, O. Korablev
Summary: The SPICAM/MEX UV spectrometer used occultation method to probe the Martian atmosphere and obtained good spatial and seasonal coverages. The study analyzed the observations of Martian ozone and compared them with a global climate model, showing overall agreement with quantitative differences in certain regions. This research provides important data for studying Martian ozone.
Article
Astronomy & Astrophysics
G. Randall Gladstone, Joshua A. Kammer, Danica J. Adams, Yuk L. Yung, Wayne R. Pryor, Darrell F. Strobel, Leslie A. Young, Joel W. M. Parker, S. Alan Stern
Summary: The Alice spectrograph on New Horizons observed far-ultraviolet airglow emissions on Pluto during a flyby in July 2015. One particular observation, PColor2, provided insight into the emission lines of atomic hydrogen and the abundance profiles of H atoms and CH4 molecules in Pluto's atmosphere, which can be used to monitor seasonal climate variations remotely. The brightness of Lyman alpha emissions and the near-surface mixing ratio of CH4 on Pluto were highlighted in the study.
Article
Astronomy & Astrophysics
A. Piccialli, A. C. Vandaele, L. Trompet, L. Neary, S. Viscardy, J. T. Erwin, A. Maattanen, F. Daerden, Y. Willame, S. Robert, S. Aoki, V Wilquet, F. Lefevre, F. Montmessin
Summary: Rapid variations of pressure, temperature, and illumination at the day-night terminator can cause asymmetries in the distribution of atmosphere constituents, with ozone gradients across the terminator on Mars due to photolysis. While retrieval algorithms typically assume a spherically symmetrical atmosphere, it is important to consider photochemically induced variations for accurate retrievals. The impact of gradients on ozone retrievals is closely related to the local atmospheric structure, with smaller impacts at sunrise and significant impacts at sunset.
Article
Multidisciplinary Sciences
Anna A. Fedorova, Franck Montmessin, Oleg Korablev, Mikhail Luginin, Alexander Trokhimovskiy, Denis A. Belyaev, Nikolay I. Ignatiev, Franck Lefevre, Juan Alday, Patrick G. J. Irwin, Kevin S. Olsen, Jean-Loup Bertaux, Ehouarn Millour, Anni Maattanen, Alexey Shakun, Alexey V. Grigoriev, Andrey Patrakeev, Svyatoslav Korsa, Nikita Kokonkov, Lucio Baggio, Francois Forget, Colin F. Wilson
Article
Geosciences, Multidisciplinary
L. Gkouvelis, J-C. Gerard, F. Gonzalez-Galindo, B. Hubert, N. M. Schneider
GEOPHYSICAL RESEARCH LETTERS
(2020)
Article
Astronomy & Astrophysics
L. Gkouvelis, J. -C. Gerard, B. Ritter, B. Hubert, N. M. Schneider, S. K. Jain
Article
Astronomy & Astrophysics
Daria Evdokimova, Denis Belyaev, Franck Montmessin, Jean-Loup Bertaux, Oleg Korablev
PLANETARY AND SPACE SCIENCE
(2020)
Article
Instruments & Instrumentation
Clement Royer, F. Poulet, J-M Reess, C. Pilorget, V Hamm, T. Fouchet, S. Maurice, O. Forni, P. Bernardi, F. Montmessin, L. Lapauw, J. Parisot, M. Bonafous, O. Gasnault, R. C. Wiens
REVIEW OF SCIENTIFIC INSTRUMENTS
(2020)
Article
Astronomy & Astrophysics
J. -C. Gerard, L. Gkouvelis, B. Bonfond, D. Grodent, G. R. Gladstone, V. Hue, T. K. Greathouse, M. Versteeg, J. A. Kammer, M. Blanc
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2020)
Article
Astronomy & Astrophysics
N. M. Schneider, Z. Milby, S. K. Jain, F. Gonzalez-Galindo, E. Royer, J-C. Gerard, A. Stiepen, J. Deighan, A. I. F. Stewart, F. Forget, F. Lefevre, S. W. Bougher
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2020)
Article
Astronomy & Astrophysics
J. -C. Gerard, S. Aoki, Y. Willame, L. Gkouvelis, C. Depiesse, I. R. Thomas, B. Ristic, A. C. Vandaele, F. Daerden, B. Hubert, J. Mason, M. R. Patel, J. -J. Lopez-Moreno, G. Bellucci, M. A. Lopez-Valverde, B. Beeckman
Article
Geochemistry & Geophysics
Rena A. Lee, Joseph M. Ajello, Charles P. Malone, J. Scott Evans, Victoir Veibell, Gregory M. Holsclaw, William E. McClintock, Alan C. Hoskins, Sonal Jain, Jean-Claude Gerard, Nicholas M. Schneider
Summary: This study analyzed laboratory emission spectra of carbon monoxide (CO) excited by electron impact in the Middle UltraViolet (MUV) range and determined vibrational intensities and emission cross sections for various systems, which are important for modeling UV observations of the atmospheres of Venus and Mars. The results provide valuable insights for understanding the excitation processes of CO molecules under electron impact, particularly in the context of spectral observations in the upper atmospheres of different planets.
JOURNAL OF GEOPHYSICAL RESEARCH-PLANETS
(2021)
Article
Geosciences, Multidisciplinary
Rohini S. Giles, Thomas K. Greathouse, Joshua A. Kammer, G. Randall Gladstone, Bertrand Bonfond, Vincent Hue, Denis C. Grodent, Jean-Claude Gerard, Maarten H. Versteeg, Scott J. Bolton, John E. P. Connerney, Steven M. Levin
Summary: The Ultraviolet Spectrograph (UVS) instrument on the Juno mission detected a transient bright emission from a point source in Jupiter's atmosphere, likely caused by a bolide. The estimated mass of the impactor is 250-5,000 kg, with an impact flux rate of 24,000 per year for impactors of similar masses.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Astronomy & Astrophysics
V Hue, T. K. Greathouse, G. R. Gladstone, B. Bonfond, J-C Gerard, M. F. Vogt, D. C. Grodent, M. H. Versteeg, J. A. Kammer, G. Clark, R. W. Ebert, R. S. Giles, M. W. Davis, K. Haewsantati, S. J. Bolton, S. M. Levin, J. E. P. Connerney
Summary: Juno-UVS has discovered intriguing features in Jupiter's polar auroral region, characterized by expanding circles of UV-brightness and varying expansion velocities. Color ratio measurements indicate that the mean electron energy responsible for these emissions ranges from 80-160 keV, with events in the outer magnetosphere beyond 100 R-J potentially causing these features. Dayside magnetopause reconnection and Kelvin-Helmholtz instabilities near the magnetopause are expected to generate field-aligned currents that could be the cause of these features.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2021)
Article
Astronomy & Astrophysics
K. Haewsantati, B. Bonfond, S. Wannawichian, G. R. Gladstone, V Hue, M. H. Versteeg, T. K. Greathouse, D. Grodent, Z. Yao, W. Dunn, J-C Gerard, R. Giles, J. Kammer, R. Guo, M. F. Vogt
Summary: A systematic analysis of bright spots in Jupiter's polar auroras was conducted, revealing isolated, localized, and transient brightenings in the polar regions. These bright spots exhibit variable emitted power and some show quasiperiodic behavior, reappearing in specific locations within short time intervals. The locations of these bright spots vary between the northern and southern hemispheres, suggesting a complex and dynamic nature of Jupiter's auroral activity.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2021)
Article
Astronomy & Astrophysics
J-C Gerard, L. Gkouvelis, B. Bonfond, D. Grodent, G. R. Gladstone, V Hue, T. K. Greathouse, J. A. Kammer, M. Versteeg, R. S. Giles
Summary: Ionospheric conductance plays a role in regulating ionospheric current characteristics and the closure of the magnetosphere-ionosphere circuit. Juno magnetometer measurements indicate statistically larger Birkeland currents in the southern hemisphere, believed to be related to higher Pedersen conductance. The study derived local precipitated electron energy flux and confirmed that the conductance is closely proportional to H-3(+) ion content, with almost equal values in the north and south hemispheres.
JOURNAL OF GEOPHYSICAL RESEARCH-SPACE PHYSICS
(2021)
Article
Geosciences, Multidisciplinary
J. -C. Gerard, S. Aoki, L. Gkouvelis, L. Soret, Y. Willame, I. R. Thomas, C. Depiesse, B. Ristic, A. C. Vandaele, B. Hubert, F. Daerden, M. R. Patel, J. J. Lopez-Moreno, G. Bellucci, J. P. Mason, M. A. Lopez-Valverde
Summary: The green oxygen emission was recently detected in the Martian dayglow using the NOMAD/UVIS instrument, and statistical analysis of the data led to the observation of the OI 630 nm emission. Comparison with a photochemical model showed good agreement with the observed characteristics, indicating a relationship between oxygen emission variations and changes in the Martian upper atmosphere composition.
GEOPHYSICAL RESEARCH LETTERS
(2021)
