D. F. Strobel
YOU?
Author Swipe
View article: First Detection of [SI] in Near‐IR JWST Observations of Io in Eclipse, and Comparison With SO Emissions, Evolving Volcanic Eruptions, and Prior UV HST‐STIS [SI] Emissions
First Detection of [SI] in Near‐IR JWST Observations of Io in Eclipse, and Comparison With SO Emissions, Evolving Volcanic Eruptions, and Prior UV HST‐STIS [SI] Emissions Open
We observed Io with the James Webb Space Telescope (JWST) NIRSpec/Integral Field Unit (1.0–5.3 μm, ) in August 2023 while the satellite was in eclipse. Thermal emission from Kanehekili Fluctus is consistent with the cooling of lava flows a…
View article: S. Ichtiaque Rasool (1930-2016)
S. Ichtiaque Rasool (1930-2016) Open
View article: Constraining Electron-Impact Ionization of O2 Through UV Aurora Observations at Ganymede
Constraining Electron-Impact Ionization of O2 Through UV Aurora Observations at Ganymede Open
Ionization of neutrals in Ganymede's O2 dominated atmosphere gives rise to an ionosphere that is only partially constrained, but may play an important role in populating Ganymede's magnetosphere with plasma. While photo-ionization processe…
View article: Observed Latitudinal, Longitudinal and Temporal Variability of Io's Atmosphere Simulated by a Purely Sublimation Driven Atmosphere
Observed Latitudinal, Longitudinal and Temporal Variability of Io's Atmosphere Simulated by a Purely Sublimation Driven Atmosphere Open
How much of Io's atmosphere is driven by volcanic outgassing or sublimation of surface frost is a question with a considerable history. We develop a time dependent surface temperature model including thermal inertia and the exact celestial…
View article: Observed Latitudinal, Longitudinal and Temporal Variability of Io's Atmosphere Simulated by a Purely Sublimation Driven Atmosphere
Observed Latitudinal, Longitudinal and Temporal Variability of Io's Atmosphere Simulated by a Purely Sublimation Driven Atmosphere Open
How much of Io's SO$_2$ atmosphere is driven by volcanic outgasing or sublimation of SO$_2$ surface frost is a question with a considerable history. We develop a time dependent surface temperature model including thermal inertia and the ex…
View article: Mass Supply from Io to Jupiter’s Magnetosphere
Mass Supply from Io to Jupiter’s Magnetosphere Open
View article: Ion Precipitation Into Io's Poles Driven by a Strong Sub‐Alfvénic Interaction
Ion Precipitation Into Io's Poles Driven by a Strong Sub‐Alfvénic Interaction Open
Juno performed two close flybys of Io and found enhanced field‐aligned proton fluxes are absorbed by Io. These protons are absorbed at mass input rates comparable to previous estimates for hydrogen losses from Io, hence Jupiter is likely t…
View article: Mass supply from Io to Jupiter's magnetosphere
Mass supply from Io to Jupiter's magnetosphere Open
Since the Voyager mission flybys in 1979, we have known the moon Io to be both volcanically active and the main source of plasma in the vast magnetosphere of Jupiter. Material lost from Io forms neutral clouds, the Io plasma torus and ulti…
View article: Oxygen production from dissociation of Europa’s water-ice surface
Oxygen production from dissociation of Europa’s water-ice surface Open
View article: An Energetic Eruption With Associated SO 1.707 Micron Emissions at Io's Kanehekili Fluctus and a Brightening Event at Loki Patera Observed by JWST
An Energetic Eruption With Associated SO 1.707 Micron Emissions at Io's Kanehekili Fluctus and a Brightening Event at Loki Patera Observed by JWST Open
We observed Io with the James Webb Space Telescope (JWST) while the satellite was in eclipse, and detected thermal emission from several volcanoes. The data were taken as part of our JWST‐ERS program #1373 on 15 November 2022. Kanehekili F…
View article: Latitudinal and Longitudinal Structure of Io's Atmosphere explained by an Atmosphere that is purely Sublimation Driven
Latitudinal and Longitudinal Structure of Io's Atmosphere explained by an Atmosphere that is purely Sublimation Driven Open
How much Io's SO2 atmosphere is driven by direct volcanic outgasing or the sublimation of SO2 surface frost is still debated. Since the sublimation supported part of the atmosphere is highly surface temperature dependent, the atmosphere is…
View article: Alternating North‐South Brightness Ratio of Ganymede's Auroral Ovals: Hubble Space Telescope Observations Around the Juno PJ34 Flyby
Alternating North‐South Brightness Ratio of Ganymede's Auroral Ovals: Hubble Space Telescope Observations Around the Juno PJ34 Flyby Open
We report results of Hubble Space Telescope observations from Ganymede's orbitally trailing side which were taken around the flyby of the Juno spacecraft on 7 June 2021. We find that Ganymede's northern and southern auroral ovals alternate…
View article: Alternating north-south brightness ratio of Ganymede's auroral ovals: Hubble Space Telescope observations around the Juno PJ34 flyby
Alternating north-south brightness ratio of Ganymede's auroral ovals: Hubble Space Telescope observations around the Juno PJ34 flyby Open
We report results of Hubble Space Telescope observations from Ganymede's orbitally trailing side which were taken around the flyby of the Juno spacecraft on June 7, 2021. We find that Ganymede's northern and southern auroral ovals alternat…
View article: Mapping the Brightness of Ganymede's Ultraviolet Aurora using Hubble Space Telescope Observations
Mapping the Brightness of Ganymede's Ultraviolet Aurora using Hubble Space Telescope Observations Open
We analyze Hubble Space Telescope (HST) observations of Ganymede made with the Space Telescope Imaging Spectrograph (STIS) between 1998 and 2017 to generate a brightness map of Ganymede's oxygen emission at 1356 A. Our Mercator projected m…
View article: Mapping the Brightness of Ganymede's Ultraviolet Aurora Using Hubble Space Telescope Observations
Mapping the Brightness of Ganymede's Ultraviolet Aurora Using Hubble Space Telescope Observations Open
We analyze Hubble Space Telescope observations of Ganymede made with the Space Telescope Imaging Spectrograph between 1998 and 2017 to generate a brightness map of Ganymede's oxygen emission at 1,356 Å. Our Mercator projected map demonstra…
View article: Figure Data for "Mapping the Brightness of Ganymede's Ultraviolet Aurora using Hubble Space Telescope Observations"
Figure Data for "Mapping the Brightness of Ganymede's Ultraviolet Aurora using Hubble Space Telescope Observations" Open
Data for Figures 5 to 8 in manuscript "Mapping the Brightness of Ganymede's Ultraviolet Aurora using Hubble Space Telescope Observations" submitted to Journal of Geophysical Research (Planets)
View article: Constraints on the structure and seasonal variations of Triton’s atmosphere from the 5 October 2017 stellar occultation and previous observations
Constraints on the structure and seasonal variations of Triton’s atmosphere from the 5 October 2017 stellar occultation and previous observations Open
Context. A stellar occultation by Neptune’s main satellite, Triton, was observed on 5 October 2017 from Europe, North Africa, and the USA. We derived 90 light curves from this event, 42 of which yielded a central flash detection. Aims. We …
View article: Science goals and new mission concepts for future exploration of Titan’s atmosphere, geology and habitability: titan POlar scout/orbitEr and in situ lake lander and DrONe explorer (POSEIDON)
Science goals and new mission concepts for future exploration of Titan’s atmosphere, geology and habitability: titan POlar scout/orbitEr and in situ lake lander and DrONe explorer (POSEIDON) Open
View article: New Horizons Detection of the Local Galactic Lyman-α Background
New Horizons Detection of the Local Galactic Lyman-α Background Open
Since 2007 the Alice spectrograph on the New Horizons (NH) spacecraft has been used to periodically observe the Lyman- α (Ly α ) emissions of the interplanetary medium (IPM), which mostly result from resonant scattering of solar Ly α emiss…
View article: Pluto’s atmosphere observations with ALMA: Spatially-resolved maps of CO and HCN emission and first detection of HNC
Pluto’s atmosphere observations with ALMA: Spatially-resolved maps of CO and HCN emission and first detection of HNC Open
View article: Pluto's atmosphere observations with ALMA: spatially-resolved maps of CO and HCN emission and first detection of HNC
Pluto's atmosphere observations with ALMA: spatially-resolved maps of CO and HCN emission and first detection of HNC Open
Following the detection of CO and HCN in Pluto's atmosphere, we report on new ALMA observations of Pluto with two main goals: (i) obtaining spatially-resolved measurements (~0.06'' on the ~0.15'' disk subtended by Pluto and its atmosphere)…
View article: Brown dwarfs as ideal candidates for detecting UV aurora outside the Solar System: <i>Hubble</i> Space Telescope observations of 2MASS J1237+6526
Brown dwarfs as ideal candidates for detecting UV aurora outside the Solar System: <i>Hubble</i> Space Telescope observations of 2MASS J1237+6526 Open
Context. Observations of auroral emissions are powerful means to remotely sense the space plasma environment around planetary bodies and ultracool dwarfs. Therefore successful searches and characterization of aurorae outside the Solar Syst…
View article: Brown dwarfs as candidates for detecting UV aurora outside the Solar System: Hubble Space Telescope observations of 2MASS J1237+6526
Brown dwarfs as candidates for detecting UV aurora outside the Solar System: Hubble Space Telescope observations of 2MASS J1237+6526 Open
Context: Observations of auroral emissions are powerful means to remotely sense the space plasma environment around planetary bodies and ultracool dwarfs. Therefore successful searches and characterization of aurorae outside the Solar Syst…
View article: A major ice component in Pluto’s haze
A major ice component in Pluto’s haze Open
View article: Constraints on Pluto’s H and CH<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e528" altimg="si75.svg"><mml:msub><mml:mrow/><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:math> profiles from New Horizons Alice Ly<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e536" altimg="si43.svg"><mml:mi>α</mml:mi></mml:math> observations
Constraints on Pluto’s H and CH profiles from New Horizons Alice Ly observations Open
The Alice spectrograph on New Horizons performed several far-ultraviolet (FUV) airglow observations during the July 2015 flyby of Pluto. One of these observations, named PColor2, was a short (226 s) scan across the dayside disk of Pluto fr…
View article: An attempt to detect transient changes in Io’s SO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline" id="d1e1100" altimg="si51.svg"><mml:msub><mml:mrow/><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:math> and NaCl atmosphere
An attempt to detect transient changes in Io’s SO and NaCl atmosphere Open
View article: An Analysis of the Statistics and Systematics of Limb Anomaly Detections in HST/STIS Transit Images of Europa
An Analysis of the Statistics and Systematics of Limb Anomaly Detections in HST/STIS Transit Images of Europa Open
Several recent studies derived the existence of plumes on Jupiter’s moon Europa. The only technique that provided multiple detections is the far-ultraviolet imaging observations of Europa in transit of Jupiter taken by the Space Telescope …
View article: Re-analysis of limb anomaly detections in three HST/STIS transit images of Europa: No evidence for plumes
Re-analysis of limb anomaly detections in three HST/STIS transit images of Europa: No evidence for plumes Open
<p>After evidence for present-day geological activity on Jupiter’s moon Europa remained elusive for decades, several recent studies derived the existence of plumes on various locations. We have re-analyzed the three HST/STI…
View article: New Horizons Observations of an Ultraviolet Stellar Occultation and Appulse by Pluto’s Atmosphere
New Horizons Observations of an Ultraviolet Stellar Occultation and Appulse by Pluto’s Atmosphere Open
A few hours after its encounter with Pluto, the Alice UV instrument on the New Horizons spacecraft observed the simultaneous stellar occultation and appulse of two UV-bright stars, HD 43153 and HD 42545, respectively. As during the solar o…
View article: Suprathermal Ions in the Outer Heliosphere
Suprathermal Ions in the Outer Heliosphere Open
Suprathermal ions form from interstellar gas that is first ionized into pickup ions and then accelerated to tens and hundreds of keV in energy. The resulting suprathermal ion spectra with hundreds of keV have been previously observed throu…