E. Thiemann
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View article: Thermospheric Density, Composition, and Temperature From GOES‐R/SUVI Solar Occultations
Thermospheric Density, Composition, and Temperature From GOES‐R/SUVI Solar Occultations Open
A new data set of atomic oxygen (O) and molecular nitrogen () number density profiles, along with thermospheric temperature profiles between 180 and 500 km, has been developed. These profiles are derived from solar occultation measurements…
View article: Response of Haze Precursors on Pluto to Solar Variability
Response of Haze Precursors on Pluto to Solar Variability Open
The New Horizons flyby of Pluto mapped temperature profiles, vertical profiles of N2, CH4, C2H2, C2H4, C2H6, and the vertical profile of hazes in Pluto’s atmosphere [1]. Zhang et al. 2017 showed that Pluto’s hazes can explain the colder-th…
View article: Mesospheric and thermospheric temperatures on Mars: comparing a multi-mission dataset with a Global Climate Model
Mesospheric and thermospheric temperatures on Mars: comparing a multi-mission dataset with a Global Climate Model Open
The study of the coupling between the lower and the upper atmosphere has been hindered by the lack of continuous temperature measurements covering the whole atmosphere from the surface to the exobase. Thus, a large fraction of our knowledg…
View article: The Martian upper atmosphere’ thermal structure and variability as revealed by Maven & TGO combined datasets
The Martian upper atmosphere’ thermal structure and variability as revealed by Maven & TGO combined datasets Open
The upper atmosphere of Mars, including the mesosphere (60-120 km) and thermosphere (120 up to the exobase, around 180-230 km), is no doubt the less explored region of the red planet. Two recent and on-going missions to Mars are investigat…
View article: The climatology of the homopause altitude from the Mars Planetary Climate Model
The climatology of the homopause altitude from the Mars Planetary Climate Model Open
Introduction: The homopause defines the boundary between two distinct regions of the atmosphere: the homosphere and the heterosphere. In the homosphere, located below the homopause, strong turbulent mixing causes atmospheric gases to vary …
View article: The hydrogen Lyman α line shape in the exospheres of terrestrial objects in the solar system
The hydrogen Lyman α line shape in the exospheres of terrestrial objects in the solar system Open
The exospheres of all objects are mostly made of atomic hydrogen. Because the Sun is bright in Lyman α, the properties of the H atoms in the exospheres of certain terrestrial solar system objects can be studied by analyzing the resonantly …
View article: Interplanetary Hydrogen Observations of the Emirates Ultraviolet Spectrometer Onboard the Emirates Mars Mission
Interplanetary Hydrogen Observations of the Emirates Ultraviolet Spectrometer Onboard the Emirates Mars Mission Open
The Emirates Mars Ultraviolet Spectrometer (EMUS) aboard the Emirates Mars Mission (EMM) has been studying backscattered interplanetary hydrogen (interplanetary hydrogen (IPH)) Lyman emissions with dedicated observation strategies viz., U‐…
View article: Evidence of Extreme-ultraviolet Resonant Excitation in the Middle Corona during a Solar Flare
Evidence of Extreme-ultraviolet Resonant Excitation in the Middle Corona during a Solar Flare Open
We present observations of an eruptive solar flare on 2016 January 6 that occurred behind the solar limb from the perspective of the Earth, but was well observed by the Solar-Terrestrial Relations Observatory (or STEREO) and the Solar Extr…
View article: The dynamic response of the Earth’s exosphere to the 10-11 May 2024 Superstorm
The dynamic response of the Earth’s exosphere to the 10-11 May 2024 Superstorm Open
The exosphere is the outermost layer of the terrestrial atmosphere which is mainly comprised of atomic hydrogen (H) and extends from several hundreds of kilometers (~500 km) to several Earth radii (~60 RE). Knowledge of the 3-D structure a…
View article: Exosphere and thermosphere density measurements from GOES for space weather operations
Exosphere and thermosphere density measurements from GOES for space weather operations Open
The Earth’s thermosphere plays a critical role in the Earth’s response to space weather and satellite drag in particular. The relationship between thermospheric variability and satellite drag is relatively straightforward: A ho…
View article: The Mars Thermosphere Terminator Structure and Variability Over a Solar Cycle.
The Mars Thermosphere Terminator Structure and Variability Over a Solar Cycle. Open
Introduction:  The Extreme Ultraviolet Monitor (EUVM) onboard the Mars Atmosphere and Volatile EvolutioN (MAVEN) orbiter measures thermospheric density from about 110 to 200 km via solar occultations using its 17-22 nm channel in addi…
View article: Dynamics of the topside ionospheres of Venus and Mars as seen by recent radio science observations
Dynamics of the topside ionospheres of Venus and Mars as seen by recent radio science observations Open
Fig. 1: Topside ionospheres of Venus and Mars as seen by (a) VEX VeRa, (b) MEX MaRS and (c) MAVEN ROSE.radio science.While the orbital and environmental parameters of Venus and Mars show significant differences, their planetary ionospheres…
View article: EMM EMUS Observations of FUV Aurora on Mars: Dependence on Magnetic Topology, Local Time, and Season
EMM EMUS Observations of FUV Aurora on Mars: Dependence on Magnetic Topology, Local Time, and Season Open
We present a comprehensive study of the nightside aurora phenomenon on Mars, utilizing observations from EMUS onboard Emirates Mars Mission. The oxygen emission at 130.4 nm is by far the brightest FUV auroral emission line observed at Mars…
View article: Variability of Atomic Hydrogen Brightness in the Martian Exosphere: Insights From the Emirates Ultraviolet Spectrometer on Board Emirates Mars Mission
Variability of Atomic Hydrogen Brightness in the Martian Exosphere: Insights From the Emirates Ultraviolet Spectrometer on Board Emirates Mars Mission Open
The Emirates Mars Ultraviolet Spectrometer (EMUS), aboard the Emirates Mars Mission (EMM), has been conducting observations of ultraviolet emissions within the Martian exosphere. Taking advantage of the distinctive orbit of the EMM around …
View article: Solar and Solar Wind Energy Drivers for O<sup>+</sup> and O2+ ${\mathrm{O}}_{2}^{+}$ Ion Escape at Mars
Solar and Solar Wind Energy Drivers for O<sup>+</sup> and O2+ ${\mathrm{O}}_{2}^{+}$ Ion Escape at Mars Open
Mars once had a dense atmosphere enabling liquid water existing on its surface, however, much of that atmosphere has since escaped to space. We examine how incoming solar and solar wind energy fluxes drive escape of atomic and molecular ox…
View article: Retrieval of Ar, N<sub>2</sub>, O, and CO in the Martian Thermosphere Using Dayglow Limb Observations by EMM EMUS
Retrieval of Ar, N<sub>2</sub>, O, and CO in the Martian Thermosphere Using Dayglow Limb Observations by EMM EMUS Open
The Emirates Ultraviolet Spectrometer (EMUS) onboard the Emirates Mars Mission (EMM) Hope probe images Mars at wavelengths extending from approximately 100 to 170 nm. EMUS observations began in February 2021 and cover over a full Mars year…
View article: Atmospheric Tides in the Middle and Upper Atmosphere of Mars at Northern High Latitudes: A Comparison of MAVEN‐EUVM and MRO‐MCS Observations With Model Results
Atmospheric Tides in the Middle and Upper Atmosphere of Mars at Northern High Latitudes: A Comparison of MAVEN‐EUVM and MRO‐MCS Observations With Model Results Open
Much of the variability in the Martian thermosphere can be attributed to vertically propagating atmospheric tides that are known to achieve significant amplitudes in this region. Concurrent observations from different altitudes have been u…
View article: The Climatology of Mars Thermospheric Polar Warming at Aphelion
The Climatology of Mars Thermospheric Polar Warming at Aphelion Open
Thermospheric polar warming (TPW) is observed conclusively for the first time at Mars during the aphelion/Northern Summer season using solar occultation (SO) measurements made by the Extreme Ultraviolet Monitor (EUVM) onboard the Mars Atmo…
View article: Solar and solar wind energy drivers for O+ and O2+ ion escape at Mars
Solar and solar wind energy drivers for O+ and O2+ ion escape at Mars Open
Mars once had a dense atmosphere enabling liquid water existing on its surface, however, much of that atmosphere has since escaped to space. We examine how incoming solar and solar wind energy fluxes drive escape of atomic and molecular ox…
View article: EMM EMUS Observations of Hot Oxygen Corona at Mars: Radial Distribution and Temporal Variability
EMM EMUS Observations of Hot Oxygen Corona at Mars: Radial Distribution and Temporal Variability Open
We present the first observations of the dayside coronal oxygen emission in far ultraviolet (FUV) measured by the Emirates Mars Ultraviolet Spectrometer (EMUS) onboard the Emirates Mars Mission (EMM). The high sensitivity of EMUS is provid…
View article: Solar and solar wind energy drivers for O+ and O2+ ion escape at Mars
Solar and solar wind energy drivers for O+ and O2+ ion escape at Mars Open
Mars once had a dense atmosphere enabling liquid water existing on its surface, however, much of that atmosphere has since escaped to space. We examine how incoming solar and solar wind energy fluxes drive escape of atomic and molecular ox…
View article: Ultra‐Fast Kelvin Wave Packets in Mars' Atmosphere and Their Interactions With Tides as Viewed by MAVEN/NGIMS and MRO/MCS
Ultra‐Fast Kelvin Wave Packets in Mars' Atmosphere and Their Interactions With Tides as Viewed by MAVEN/NGIMS and MRO/MCS Open
A key element of successful aerobraking operations at Mars is accurate thermospheric density predictions. Evidence suggests that much of the longitude variability in Mars' aerobraking region is associated with atmospheric tides, and the da…
View article: EMM EMUS Observations of Hot Oxygen Corona at Mars: Radial Distribution and Temporal Variability
EMM EMUS Observations of Hot Oxygen Corona at Mars: Radial Distribution and Temporal Variability Open
We present the first observations of the dayside coronal oxygen emission in far ultraviolet (FUV) measured by the Emirates Mars Ultraviolet Spectrometer (EMUS) onboard the Emirates Mars Mission (EMM).The high sensitivity of EMUS is providi…
View article: Ultra-fast Kelvin wave packets in Mars’ Atmosphere and their Interactions with Tides as Viewed by MAVEN/NGIMS and MRO/MCS
Ultra-fast Kelvin wave packets in Mars’ Atmosphere and their Interactions with Tides as Viewed by MAVEN/NGIMS and MRO/MCS Open
A key element of successful aerobraking operations at Mars is accurate thermospheric density predictions. Evidence suggests that much of the longitude variability in Mars’ aerobraking region is associated with atmospheric tides, and the da…
View article: A Survey of Strong Electric Potential Drops in the Ionosphere of Venus
A Survey of Strong Electric Potential Drops in the Ionosphere of Venus Open
Every planet or moon with an ionosphere is thought to generate a weak electrical potential which helps ions overcome gravity and escape to space. A pilot study at Venus by Collinson et al. (2016, https://doi.org/10.1002/2016GL068327 ) indi…
View article: Evidence of Non‐Thermal Hydrogen in the Exosphere of Mars Resulting in Enhanced Water Loss
Evidence of Non‐Thermal Hydrogen in the Exosphere of Mars Resulting in Enhanced Water Loss Open
Atomic H is a direct tracer of water loss at Mars. The recent discovery of annual enhancements in its escape rate near perihelion, in excess of the previously established theory, indicates that Mars has lost substantial amounts of water to…
View article: Small Platforms, High Return: The Need to Enhance Investment in Small Satellites for Focused Science, Career Development, and Improved Equity
Small Platforms, High Return: The Need to Enhance Investment in Small Satellites for Focused Science, Career Development, and Improved Equity Open
Whitepaper #268 in the Decadal Survey for Solar and Space Physics (Heliophysics) 2024-2033. Main topics: infrastructure/workforce/other programmatic. Additional topics: state of the profession; research tools and infrastructure.
View article: Measurements of gravity wave global distributions and trends in the ITM
Measurements of gravity wave global distributions and trends in the ITM Open
Global measurements to characterize gravity wave (GW) parameters, distribution and main trends in the ITM are crucial. This white paper summarizes current GW measurement techniques operated from ground-based to space borne platforms. The c…