Explanipedia

Joint Observations of Mesospheric Aerosols on Mars from MAVEN/IUVS and MRO/MCS Open

Ashwin Braude, M. Slipski, Sumedha Gupta, N. M. Schneider, A. Kleinboehl , et al. · 2025

JOINT OBSERVATIONS OF MESOSPHERIC AEROSOLS ON MARS FROM MAVEN/IUVS AND MRO/MCS Ashwin S. Braude1, Marek Slipski1, Sumedha Gupta2, Nicholas M. Schneider2, Armin Kleinböhl1, Franck Montmessin3, Sonal Jain2, Roger V. Yelle4 and Justin Deighan…

Strategy for Student Inclusion within a University-Based Business Incubator Open

Jani M. Pallis, Neal Lewis, Ravi Mishra, Navarun Gupta, Arthur McAdams , et al. · 2025

Unexpected increase of the deuterium to hydrogen ratio in the Venus mesosphere Open

A. Mahieux, S. Viscardy, R. V. Yelle, Hiroki Karyu, Sarah Chamberlain , et al. · 2024

This study analyzes H 2 O and HDO vertical profiles in the Venus mesosphere using Venus Express/Solar Occultation in the InfraRed data. The findings show increasing H 2 O and HDO volume mixing ratios with altitude, with the D/H ratio risin…

Seasonal Variation of Saturn's Lyα Brightness Open

Peter Stephenson, Tommi Koskinen, Zarah Brown, Éric Quémerais, P. Lavvas , et al. · 2024

We examine Saturn’s nonauroral (dayglow) emissions at Ly α observed by the Cassini/Ultraviolet Imaging Spectrograph (UVIS) instrument from 2003 until 2017, to constrain meridional and seasonal trends in the upper atmosphere. We separate vi…

Martian atmospheric hydrogen and deuterium: Seasonal changes and paradigm for escape to space Open

J. T. Clarke, Majd Mayyasi, Dolon Bhattacharyya, Jean‐Yves Chaufray, Nicolas Schneider , et al. · 2024

Mars’ water history is fundamental to understanding Earth-like planet evolution. Water escapes to space as atoms, and hydrogen atoms escape faster than deuterium giving an increase in the residual D/H ratio. The present ratio reflects the …

Unexpected increase in water abundance and the deuterium-to-hydrogen ratio observed in Venus’s mesosphere Open

A. Mahieux, S. Viscardy, R. V. Yelle, Hiroki Karyu, Sarah Chamberlain , et al. · 2024

Until the ESA Venus Express mission, the Venus mesosphere was a poorly understood region of the Venus’s atmosphere. This mission, which operated between 2006 and 2014, revealed the composition and thermal structure of the mesosphere …

Seasonal Enhancement in Upper Atmospheric D/H at Mars Driven by Both Thermospheric Temperature and Mesospheric Water Open

Eryn Cangi, Michael Chaffin, R. V. Yelle, B. S. Gregory, Justin Deighan · 2024

The D/H ratio in water on Mars, R water , is 4–6× the Earth ratio, signifying past water loss to space. Recently, measurements have revealed high values of the D/H ratio in hydrogen, R atomic , in the thermosphere during southern summer. H…

Seasonal enhancement in upper atmospheric D/H at Mars driven by both thermospheric temperature and mesospheric water Open

Eryn Cangi, Michael Chaffin, R. V. Yelle, Bethan Gregory, Justin Deighan · 2023

The D/H ratio in water on Mars, Rwater, is 4–6× the Earth ratio, signifying past water loss to space. Recently, measurements have revealed high values of the D/H ratio in hydrogen, Ratomic, in the thermosphere during southern summer. Here,…

Fully Coupled Photochemistry of the Deuterated Ionosphere of Mars and Its Effects on Escape of H and D Open

Eryn Cangi, Michael Chaffin, R. V. Yelle, Bethan Gregory, Justin Deighan · 2023

Although deuterium (D) on Mars has received substantial attention, the deuterated ionosphere remains relatively unstudied. This means that we also know very little about non‐thermal D escape from Mars, since it is primarily driven by exces…

Seasonal, Latitudinal, and Longitudinal Trends in Nighttime Ozone Vertical Structure on Mars From MAVEN/IUVS Stellar Occultations Open

Ashwin Braude, Franck Montmessin, N. M. Schneider, Sumedha Gupta, Sonal Jain , et al. · 2023

Stellar occultation measurements conducted by the Mars Atmosphere and Volatile and EvolutioN/Imaging UltraViolet Spectrograph instrument were able to make vertically resolved measurements of ozone density in the middle atmosphere of Mars t…

The first EMM/EMUS stellar occultation measurements of the Martian atmosphere in both extreme and far ultraviolet wavelengths Open

Sonal Jain, Justin Deighan, Michael Chaffin, Greg Holsclaw, R. J. Lillis , et al. · 2023

The major scientific objective of the Emirates Mars Mission (EMM) is to explore the global atmospheric dynamics of the Martian atmosphere both in short term (diurnal) and long term (seasonal). The Emirates Mars Ultraviolet Spectrometer (EM…

Fully coupled photochemistry of the deuterated ionosphere of Mars and its effects on escape of H and D Open

Eryn Cangi, Michael Chaffin, R. V. Yelle, Bethan Gregory, Justin Deighan · 2022

Although deuterium (D) on Mars has received substantial attention, the deuterated ionosphere remains relatively unstudied. This means that we also know very little about non-thermal D escape from Mars, since it is primarily driven by exces…

Isotope Ratios in the Martian Upper Atmosphere Measured by MAVEN NGIMS Open

Shane W. Stone, Gerónimo Villanueva, R. V. Yelle, M. Benna, Giuliano Liuzzi , et al. · 2022

<p>Isotope ratios manifest escape of the atmosphere to space and thus evolution of the climate through time, because lighter isotopes are removed from the atmosphere at a faster rate than heavier isotopes. Therefore, atmospheres expe…

Dynamical Core Damping of Thermal Tides in the Martian Atmosphere Open

Yuan Lian, M. I. Richardson, Claire Newman, Chris Lee, A. D. Toigo , et al. · 2022

Atmospheric oscillations with daily periodicity are observed in in situ near-surface pressure, temperature, and winds observations and also in remotely sensed temperature and pressure observations of the Martian atmosphere. Such oscillatio…

Compositional Measurements of Saturn's Upper Atmosphere and Rings From Cassini INMS: An Extended Analysis of Measurements From Cassini's Grand Finale Orbits Open

Joseph Serigano, Sarah M. Hörst, Chao He, Thomas Gautier, R. V. Yelle , et al. · 2022

The Cassini spacecraft's final orbits sampled Saturn's atmosphere and returned surprisingly complex mass spectra from the Ion and Neutral Mass Spectrometer. Signal returned from the instrument included native Saturn species, as expected, a…

Neutral Composition and Horizontal Variations of the Martian Upper Atmosphere from MAVEN NGIMS Open

Shane W. Stone, R. V. Yelle, Mehdi Benna, M. K. Elrod, P. R. Mahaffy · 2022

This is the data set to accompany our publication, "Neutral Composition and Horizontal Variations of the Martian Upper Atmosphere from MAVEN NGIMS" in Journal of Geophysical Research: Planets. The repository contains .csv files. Within the…

In Situ Measurements of Thermal Ion Temperature in the Martian Ionosphere Open

K. G. Hanley, J. P. McFadden, D. L. Mitchell, C. M. Fowler, Shane W. Stone , et al. · 2021

In situ measurements of ionospheric and thermospheric temperatures are experimentally challenging because orbiting spacecraft typically travel supersonically with respect to the cold gas and plasma. We present temperatures in Mars' ionosph…

H2 photo-absorption cross section dataset Open

Joshua Chadney, Tommi Koskinen, Xiao-han Hu, M. Galand, P. Lavvas , et al. · 2021

This dataset contains the high-resolution H2 photo-absorption cross section of that is used in Chadney et al. (2021). The cross-section is composed from the following sources: - 0.1 - 80.4 nm: Backx et al. (1976) measurements, - 80.4 - 84.…

Energy deposition in Saturn's equatorial upper atmosphere Open

Joshua Chadney, Tommi Koskinen, Xinmiao Hu, M. Galand, P. Lavvas , et al. · 2021

We construct Saturn equatorial neutral temperature and density profiles of H, H$_2$, He, and CH$_4$, between 10$^{-12}$ and 1 bar using measurements from Cassini's Ion Neutral Mass Spectrometer (INMS) taken during the spacecraft's final pl…

Energy deposition in Saturn’s equatorial upper atmosphere Open

Joshua Chadney, Tommi Koskinen, Xinmiao Hu, M. Galand, P. Lavvas , et al. · 2021

Determination of the Venus eddy diffusion profile from CO and CO2 profiles using SOIR/Venus Express observations Open

A. Mahieux, R. V. Yelle, Nao Yoshida, Séverine Robert, Arianna Piccialli , et al. · 2021

We present a study of the SOIR/Venus Express CO2 and CO profiles in order to constrain the eddy diffusion profile in the Venus mesosphere (80 to 130 km of altitude). We compute the mean number density profile of both species, and the hydro…

Neutral Composition of the Martian Upper Atmosphere as Measured by MAVEN NGIMS Open

Shane W. Stone, R. V. Yelle, M. Benna, M. K. Elrod, P. R. Mahaffy · 2020

<p>The Mars Atmosphere and Volatile EvolutioN (MAVEN) Neutral Gas and Ion Mass Spectrometer (NGIMS) measures in situ the composition and variability of neutral species in the Martian upper atmosphere.<sup>1,2</sup> These …

Hydrogen Escape from Mars is Driven by Seasonal and Dust Storm Transport of Water Open

Shane W. Stone, R. V. Yelle, Mehdi Benna, Daniel Lo, M. K. Elrod , et al. · 2020

Provided here are the 1D photochemical models used in our publication, "Hydrogen Escape from Mars is Driven by Seasonal and Dust Storm Transport of Water" (doi:10.1126/science.aba5229). Two models are supplied: one for the low water case (…

Hydrogen Escape from Mars is Driven by Seasonal and Dust Storm Transport of Water Open

Shane W. Stone, R. V. Yelle, Mehdi Benna, Daniel Lo, M. K. Elrod , et al. · 2020

Provided here are the 1D photochemical models used in our publication, "Hydrogen Escape from Mars is Driven by Seasonal and Dust Storm Transport of Water" (doi:10.1126/science.aba5229). Two models are supplied: one for the low water case (…

Vertical Propagation of Wave Perturbations in the Middle Atmosphere on Mars by MAVEN/IUVS Open

Hiromu Nakagawa, Naoki Terada, Sonal Jain, N. M. Schneider, Franck Montmessin , et al. · 2020

This work offers the first in‐depth study of the global characteristics of wave perturbations in temperature profiles at 20–140 km altitudes derived from the Imaging Ultraviolet Spectrograph (IUVS) onboard the Mars Atmosphere and Volatile …

Compositional Measurements of Saturn's Upper Atmosphere and Rings from Cassini INMS Open

Joseph Serigano, Sarah M. Hörst, Chao He, Thomas Gautier, R. V. Yelle , et al. · 2020

The Cassini spacecraft's last orbits directly sampled Saturn's thermosphere and revealed a much more chemically complex environment than previously believed. Observations from the Ion and Neutral Mass Spectrometer (INMS) aboard Cassini pro…

Compositional Measurements of Saturn's Upper Atmosphere and Rings from Cassini INMS Open

Joseph Serigano, Sophie van der Horst, Chao He, Thomas Gautier, R. V. Yelle , et al. · 2020

The Cassini spacecraft's last orbits directly sampled Saturn's thermosphere and revealed a much more chemically complex environment than previously believed. Observations from the Ion and Neutral Mass Spectrometer (INMS) aboard Cassini pro…

A Warm Layer in the Nightside Mesosphere of Mars Open

Hiromu Nakagawa, Sonal Jain, N. M. Schneider, Franck Montmessin, R. V. Yelle , et al. · 2020

We report a new set of stellar occultation measurements for nightside temperature profiles made by the Mars Atmosphere and Volatile EvolutioN/Imaging Ultraviolet Spectrograph that provide evidence for a recurring layer of warm air between …

Data associated with publication “Compositional Measurements of Saturn’s Upper Atmosphere and Rings from Cassini INMS” in the Journal of Geophysical Research: Planets Open

Joseph Serigano, Sarah M. Hörst, Chao He, T. N. Gautier, R. V. Yelle , et al. · 2020

These data comprise the end-products of our analyses. This includes the cleaned Cassini INMS mass spectrum from orbits 288, 290, 291, 292, and 293 for m/z 1 to 20 amu. The inbound density profiles of H2, He, CH4, H2O, and NH3 as well as th…

Two-dimensional model for the martian exosphere: Applications to hydrogen and deuterium Lyman α observations Open

Dolon Bhattacharyya, Jean‐Yves Chaufray, Majd Mayyasi, J. T. Clarke, Shane W. Stone , et al. · 2019

R. V. Yelle YOU? Author Swipe